[Question]
  [
You are responsible for building a new freeway. However, it leads through
mountainous lands and therefore needs numerous bridges and tunnels. The 
freeway itself should stay at a single level.
**Input**
You are given a rough ASCII description of how the mountains look like on 
standard input, such as the following:
```
                         /\                                
                        /  \                               
                   /\  /    \                              
            /\    /  \/      \                             
           /  \  /            \                  /\        
          /    \/              \                /  \       
_        /                      \        /\    /    \      
 \      /                        \      /  \  /      \  /\ 
  \    /                          \    /    \/        \/  \
   \  /                            \  /                    
    \/                              \/                     
```
The `_` in the first column marks the beginning and the level of the road. 
The mountain range is contiguous and if the last segment will be a bridge, 
it has an even number of characters.
You may assume that a line of input is never longer than 100 characters 
and that there are no more than 15 lines. Every line has the same length 
which is possibly space-padded at the end. The road never starts within a 
mountain or as a bridge. The first thing following the road tile in the 
input is either a slope down or up.
**Output**
Output is the same mountain range, except that there is now a road where 
previously was only its beginning. Output is given on standard output.
For this there are numerous rules:
1. The road must start at the place indicated in the input and remain the 
same level throughout. To make it easier, we have prepared a number of 
premade road tiles which look like this: `_`:
```
_______
 \    /
  \/\/
```
2. The road must extend to the far end of the mountain range (i.e. the
length of the input lines dictates how far the road goes).
3. Tunnels must be drilled whenever a mountain is where the road needs to 
go. Tunnels go straight through the mountain and leave holes at the start 
and the end (i.e. a tunnel replaces the slope of the mountain with a 
closing parenthesis at its start and an opening parenthesis at its end).
4. Tunnels leave, well, a tunnel in the mountain which usually has a 
ceiling. Our premade road tiles luckily can be used to reinforce the 
ceiling so that the tunnel does not collapse (the line above the tunnel 
has to use `_` to reinforce the tunnel):
```
      /\
     /  \
    /____\
___)______(__
 \/        \/
```
5. The tunnel does not need to be reinforced when the mountain isn't high 
enough above it. It sounds weird to me as well but I have been told the 
premade road tiles are strong enough to hold even when spaced out in that 
case (no tunnel ceiling is drawn when there is a slope directly above the 
tunnel):
```
       /\
    /\/__\
___)______(__
 \/        \/
```
6. Bridges are needed whenever the road needs to cross a chasm. For short 
bridges the premade road tiles are strong enough but still need a bit 
support at the beginning and end of the bridge (the first downward slope 
under the bridge and the last upward slope are replaced by `Y` so that 
there is a support beam for the bridge):
```
_____
 Y  Y
  \/
```
7. Longer bridges need additional support. A long bridge is one that has 
more than six unsupported road tiles in a row. Long bridges need a pillar 
in their center. Pillars are easily built with our prebuilt pillar beams 
which look like this: `|`. Each pillar needs two of those and they extend 
down to the bottom of the chasm:
```
_____________________________
 Y            ||            Y
  \        /\ || /\      /\/ 
   \  /\  /  \||/  \  /\/    
    \/  \/    \/    \/       
```
8. Since the input only represents a portion of the whole mountain range 
the freeway needs to be built through, it may end abruptly in the middle 
of a bridge or tunnel. The long bridge rule still applies for the final 
segment and you can assume that the first part beyond the given input 
supports the bridge again.
Following the above rules we get the following for our input:
```
                         /\                                
                        /  \                               
                   /\  /    \                              
            /\    /  \/      \                             
           /  \  /            \                  /\        
          /____\/______________\                /__\       
_________)______________________(________)(____)____(______
 Y      Y                        Y      Y  Y  Y      Y  YY 
  \    /                          \    /    \/        \/  \
   \  /                            \  /                    
    \/                              \/                     
```
Shortest code by character count wins. Trailing whitespace in the lines is 
ignored for validation.
**Sample input 1**
```
_                                                           
 \                            /\                            
  \                          /  \                           
   \                        /    \                          
    \                /\    /      \              /\        /
     \    /\        /  \  /        \      /\  /\/  \      / 
      \  /  \      /    \/          \    /  \/      \/\  /  
       \/    \    /                  \  /              \/   
              \  /                    \/                    
               \/                                           
```
**Sample output 1**
```
____________________________________________________________
 Y             ||             YY             ||             
  \            ||            /  \            ||             
   \           ||           /    \           ||             
    \          ||    /\    /      \          ||  /\        /
     \    /\   ||   /  \  /        \      /\ |/\/  \      / 
      \  /  \  ||  /    \/          \    /  \/      \/\  /  
       \/    \ || /                  \  /              \/   
              \||/                    \/                    
               \/                                           
```
**Sample input 2**
```
                                           /\  /\                      
                                          /  \/  \                    /
           /\                            /        \  /\              / 
    /\    /  \                          /          \/  \            /  
   /  \  /    \/\                      /                \    /\    /   
  /    \/        \                    /                  \  /  \  /    
_/                \                  /                    \/    \/     
                   \                /                                  
                    \            /\/                                   
                     \  /\      /                                      
                      \/  \    /                                       
                           \  /                                        
                            \/                                         
```
**Sample output 2**
```
                                           /\  /\                      
                                          /  \/  \                    /
           /\                            /        \  /\              / 
    /\    /  \                          /          \/  \            /  
   /  \  /    \/\                      /                \    /\    /   
  /____\/________\                    /__________________\  /__\  /____
_)________________(__________________)____________________()____()_____
                   Y       ||       Y                                  
                    \      ||    /\/                                   
                     \  /\ ||   /                                      
                      \/  \||  /                                       
                           \| /                                        
                            \/                                         
```
**Note**
Trailing spaces in the output are ignored for comparison with the 
reference solutions.
**Winning condition**
Shortest code wins, as is customary in golf. In case of a tie, the earlier 
solution wins.
**Test cases**
There are two tests scripts, containing identical test cases:
* [bash](http://hypftier.de/dump/CG3179/test)
* [PowerShell](http://hypftier.de/dump/CG3179/test.ps1)
Invocation is in both cases: `<test script> <my program> [arguments]`, 
e.g. `./test ruby bridges.rb` or `./test.ps1 ./bridges.exe`.
**Another note**
This task was part of a golf contest held at my university during 
2011-W24. The scores and languages of our contestants were as follows:
* 304 – Perl
* 343 – C
* 375 – C
* 648 – Python
Our own solution (thanks to Ventero) was
* 262 – Ruby
  
[Answer]
## Perl, 210 195 194 193 chars
*update*
Same ideas, but applied very differently, for the most part.
Run with `perl -p0` (4 chars counted for the switches).
```
($o,$c,$r,$b)=/((.+\n)?(_.+\n)(.+\n)?)/;/\n/;$n=$-[0];$c=~s{/ }{/_}g;$r=~y{ /\\}{_)(};map{s{\\(   +)  \1(/|\n)}{\\$1||$1$2}g,y{\\/}{Y}}$b;s/\Q$o/$c$r$b/;1while(s/_ /__/||s/(\|.{$n}) /$1|/s) 
```
This also requires a change to the bash test script, so as not to over-quote the args:
```
-   got=$("$cmd" "$args")
+   got=$("$cmd" $args)
```
BTW, I really appreciate the test scripts, @Joey.
commented:
```
#-p : implicitly read input and print after transformations
#-0 : "slurp mode": don't break lines
# grab the roadway line, along with the lines above and below for ceiling and buttresses
# also grab the whole match in $o for replacing later
($o,$c,$r,$b)=/((.+\n)?(_.+\n)(.+\n)?)/;
# compute line length
/\n/;$n=$-[0];
# start ceilings
$c=~s{/ }{/_}g;
# build the road and tunnels
$r=~y{ /\\}{_)(};
# use map to avoid repeating $b =~
map{
  # insert the pillar tops
  s{\\(   +)  \1(/|\n)}{\\$1||$1$2}g,
  # and the buttresses
  y{\\/}{Y}
} $b;
# put those 3 (or 2) lines back into the original
s/\Q$o/$c$r$b/;
# extend ceiling tiles to the right and pillars downward
1while(s/_ /__/||s/(\|.{$n}) /$1|/s)
```
*edits*:
* replace "`{3,}`" with 3 literal spaces and the `+` quantifier, to
save another character
* use the `1while(...)` form, where I can omit
the semicolon at the end of the script
---
*original* (see history for commented version)
```
@a=map{($r=$n),y{ /\\}{_)(}if/_/;$n++;$_}<>;if($r){while($a[$r-1]=~s{(/[ _]*) }{$1_}){}}map{s{(^|\\)( {3,})  \2(/|$)}{$1$2||$2$3}g;y{\\/}{YY}}$a[$r+1];$_=join'',@a;/\n/;$n=$-[0];while(s/(\|.{$n}) /$1|/s){}print
```
I deliberately didn't look at @Howard's Perl solution until mine was working, but I was able to improve my golfing by looking afterward.
In particular, the regexps for tunnel ceilings and extending pillars helped. Nicely done, Howard.
Conversely, my alternative for getting line length, using the implicit $\_ for the print, leaving off the final semicolon, and removing newlines could shorten Howard's to 222 characters.
[Answer]
### Perl, 234 characters
```
$_=join'',<>;$l=index($_,"\n");
($w)=/(_[^\n]*)/;$w=~y/ \\\//_()/;s/_[^\n]*/$w/e;
while(s/(\/[ _]*) (?=[^\n]*\n_)/$1_/||s/(_.{$l})[\\\/]/$1Y/s){}while(s/(\n( |Y *Y)*)Y( {3,})  \3(Y| ?\n)/\1Y\3||\3\4/||s/(?<=\|.{$l}) /|/s){}
print $_;
```
This is a perl regex-only solution. It passes all given test cases.
The identical but more readable version shows the steps taken to obtain the result:
```
$_=join'',<>;                    # read the input
$l=index($_,"\n");               # determine length of line
($w)=/(_[^\n]*)/;                # extract the line starting with _
$w=~y/ \\\//_()/;                # and build road there (i.e. replace all chars in line)
s/_[^\n]*/$w/e;                  # put road back into string
while(s/(\/[ _]*) (?=[^\n]*\n_)/$1_/||s/(_.{$l})[\\\/]/$1Y/s){}
                                 # build ceiling of tunnels
                                 # build Y supports directly below the road
while(s/(\n( |Y *Y)*)Y( {3,})  \3(Y| ?\n)/\1Y\3||\3\4/||s/(?<=\|.{$l}) /|/s){}
                                 # build center support in middle of bridges
                                 # and extend them down to the ground
print $_;                        # print result
```
[Answer]
# C++, 662 622 598 chars, 4 lines
```
#include<iostream>
#include<string>
#define s for(
#define v g[t][f]
int t,f,r,q,m=-1,w,b,e,h,j,x,y,l,c=18;int main(){std::string g[19];s;r<19;h=c)getline(std::cin,g[r++]);s;c>=0;g[c--].push_back(0))(q=g[c].size())&&g[c][0]-95?0:r=c;s;c<q;y=0){x=g[r][++c];x==47?x=41,w=e=1:++y;x==92?x=40,w=0:++y;t=r-1;f=c;y>1?x=95,w?r&&v==32?v=95:0:++b:0;c-q?0:e=1;t++;s v=x;m<0;)g[h].find(47)<g[h--].npos?m=h:0;t=r+1;if(r<m){(y=v)==47?y=89,e=1:0;v=y-92?y:89;if(e){y=e=0;if((b/=2)>4){j=l=r+1;s;!y;t=j,f=c-b+1,v==32?v=124,++j:0)t=l,y=f=c-b,v==32?v=124,l++,y=0:0;}b=0;}}}s f=q,t=0;t<=m;std::cout<<g[t++]<<'\n')v=32;}
```
This should be it, I've tested this out with the powershell script so it should be ok...
**Edit 1**
Replaced all char constants with numbers, removed successive calls to std::cout + a few other minor changes.
**Edit 2**
last edit, just to get it less than 600. Took out g[t][f] as a #define and moved a few things around.
[Answer]
## Ruby, 382 356 353 characters
I thought to give a non-regex solution a shot. 
```
m=$<.read;n,r,s,$e,t=(/\n/=~m)+1,/^_/=~m,m.size,(u,d=47,92),0;def j y;$e.member? y;end;(n-1).times{|i|x=r+i;c=m[x];j(c)||(m[x]=95;a,b=x-n,x+n;t<41||a<0||m[a]>32||m[a]=95;b>s||!j(m[b])||(m[b]<d||(p=(/\/|\n/=~m[b..s])/2+b;p-b<4||(w=[f=false,f];p.step(s,n){|p|2.times{|i|(w[i]||=j m[i=p+i])||m[i]='|'}}));m[b]='Y'));c!=u||t=m[x]=41;c!=d||t=m[x]=40};print m
```
The biggest space saver here is to use conditional `||` operator instead of `if - elsif - end`. So instead of writing `if(a) lorem_ipsum end` I've written `!a||lopem_ipsum`. Larger blocks can included using parenthesis `!a||(block)`. If the condition includes `&&` operators then they must negated by using parenthesis and a `!` or by using De Morgan's laws. 
And here's the same with more words
```
# read the STDIN to string
mountains = $<.read
line_length,road_level,size,$slopes,in_tunnel =
        (/\n/ =~ mountains) + 1, # Fint the first new line
        /^_/ =~ mountains, # Find the index of the road
        mountains.size, 
        (slope_up,slope_down=47,92),
        0
def is_slope y;$slopes.member? y;end
# For each index in the road line
(line_length - 1).times { |i|
  curindex = road_level + i
  curchar = mountains[curindex]
  # If not a slope then
  (is_slope(curchar))|| (
    # mark road as underscore
    mountains[curindex] = 95
    above, below = curindex - line_length, curindex + line_length
    # add roof to tunnel if in tunnel and the mountain
    # is high enough
    in_tunnel<41||above<0||mountains[above]>32||mountains[above]=95
    # If there's a slope character below the road
    below>size||!is_slope(mountains[below])||(
      # if there's a downward slop - start a bridge
      mountains[below]<slope_down||(
          # If bridge is longer than 6 characters
          # Add support to the middle
          support_pos = (/\/|\n/=~mountains[below..size])/2+below
          support_pos-below<4||(
            # Init collision detection
            collision_detected=[f=false,f]
            # Build supports as long as 
            # There is mountains below
            support_pos.step(size,line_length) { |support_pos|
               # Add two parallel suppports
               2.times { |i|
               # Add support if the bottom of the 
               # gap has not been reached
               (collision_detected[i]||=is_slope(mountains[i=support_pos+i]))||mountains[i] = '|'
               }
            }
          )
      )
      # Add support to the beginning and to the end
      # of the bridge
      mountains[below] = 'Y'
    )
  )
  # Add tunnel entrance and exit
  curchar!=slope_up||in_tunnel=mountains[curindex]=41
  curchar!=slope_down||in_tunnel=mountains[curindex]=40
}
print mountains
```
[Answer]
## Scala, 462 characters
```
object B extends App{var r="""(?s)((?:.*\n)?)((?:.*?\n)?)(_.*?\n)(.*?\n)(.*)""".r
var r(a,b,c,d,e)=io.Source.stdin.mkString
var s=a+b.replaceAll("(?<=/ {0,99}) (?=.*\\\\)","_")+c.replaceAll("\\\\","(").replaceAll("/",")").replaceAll(" ","_")+d.replaceAll("\\\\( {3,99})  \\1/","Y$1||$1Y").replaceAll("\\\\( {3,99})  \\1\\n","Y$1||$1\n").replaceAll("\\\\( {0,9})/","Y$1Y")+e
for(i<-1 to 15)s=s.replaceAll("(?s)(?<=\\|.{"+s.split("\n")(0).size+"}) ","|")
print(s)}
```
Not particularly competitive, but I've learnt a lot about regular expressions today. :-)
[Answer]
# Erlang, 1182 characters
```
-module(b).
-export([t/0]).
t()->r([]).
r(R)->case io:get_line("")of eof->{_,Q}=lists:foldl(fun([$ |L],{$_,Q})->{$ ,[[$X|L]|Q]};([C|_]=L,{_,Q})->{C,[L|Q]}end,{$ ,[]},R),{_,P}=lists:foldl(fun s/2,{s,[]},lists:flatten(Q)),io:put_chars(lists:reverse(P));L->r([L|R])end.
s($X,{s,R})->{{r,s},[$ |R]};s($/,{{r,s},R})->{{r,r},[$/|R]};s($\\,{{r,r},R})->{{r,s},[$\\|R]};s($\n,{{r,_},R})->{u,[$\n|R]};s(_,{{r,r}=S,R})->{S,[$_|R]};s($_,{_,R})->{u,[$_|R]};s($\n,{u,R})->{{g,i,1,1,[]},[$\n|R]};s($\\,{u=S,R})->{S,[$(|R]};s($/,{u=S,R})->{S,[$)|R]};s(_,{u=S,R})->{S,[$_|R]};s($\\,{{g,i,X,_L,T},R})->{{g,o,X+1,X,[$Y|T]},R};s($/,{{g,o,X,L,T},R})->a(o,X,L),{{g,i,X+1,X,[$Y|T]},R};s($\n,{{g,S,X,L,T},R})->a(S,X,L),{{d,1},[$\n,f(T,X)|R]};s(C,{{g,S,X,L,T},R})->{{g,S,X+1,L,[C|T]},R};s($\n,{{d,_},R})->{{d,1},[$\n|R]};s($ ,{{d,X},R})->{{d,X+1},[case get(X)of y->$|;_->$ end|R]};s($/,{{d,X},R})->put(X,n),{{d,X+1},[$/|R]};s($\\,{{d,X},R})->put(X,n),{{d,X+1},[$\\|R]};s($\n=N,{S,R})->{S,[N|R]};s(X,{S,R})->{S,[X|R]}.
a(o,X,L)when X-L-1>6->Pos=round((X-L-1)/2+L),put(Pos,y),put(Pos+1,y);a(_,_,_)->v.
f(L,M)->{_,R}=lists:foldl(fun(C,{X,R})->case get(M-X)of y->{X+1,[$||R]};_->{X+1,[C|R]}end end,{1,[]},L),R.
```
Not competitive at all. To be honest, I was simply interested in producing some nice ascii art, not so much in the golfing. Note that this does not use regular expressions, instead, I wrote the state machine myself. This will also need the overquoting fix in the shell script, mentioned in the perl solution above.
[Answer]
# Powershell, ~~300~~ 295 287 bytes
*-8 bytes fix peeked from DCharness'es [answer](https://codegolf.stackexchange.com/a/3197/80745).*
```
param($s)filter e{$r,$e=$_-split'#';$e|%{$r=$r-replace($_-split';')};$r}
$x=$s-match'(.+
)?(_.+)(
.+)?'
$o,$c,$r,$b=$Matches[0..3]
for($s=$s|% *ce $o(("$c#/ ;/_"|e)+("$r# ;_#/;)#\\;("|e)+($b+'#\\(   +)  \1;\$1||$1#/|\\;Y'|e));$s-ne($x="$s#_ ;__#(?s)(?<=\|.{$($r|% Le*)}) ;|"|e)){$s=$x}$s
```
Ungolfed test script:
```
$f = {
param($s)
$x=$s-match'(.+
)?(_.+)(
.+)?'
$o,$c,$r,$b=$Matches[0..3]
$c=$c-replace'/ ','/_'                  # we assume that road does not start as a tunnel
$r=$r-replace' ','_'
$r=$r-replace'/',')'
$r=$r-replace'\\','('
$b=$b-replace'\\(   +)  \1','\$1||$1'   # we assume that road does not start as a bridge under a chasm
$b=$b-replace'/|\\','Y'
$s=$s.replace($o,"$c$r$b")              # string method replace (not operator) does not handle regexp
for(;$s-ne($x=$s-replace'_ ','__'-replace"(?s)(?<=\|.{$($r.Length)}) ",'|')){$s=$x}
$s
}
$pass = 0
$count = 0
@(
# Test 2
,(2,@'
    /\                  /\                  /\        
   /  \                /  \                /  \       
  /____\              /____\              /____\      
_)______(____________)______(____________)______(_____
         Y    ||    Y        Y    ||    Y        Y    
          \   ||   /          \   ||   /          \   
           \  ||  /            \  ||  /            \  
            \ || /              \ || /              \ 
             \||/                \||/                \
              \/                  \/                  
'@,@'
    /\                  /\                  /\        
   /  \                /  \                /  \       
  /    \              /    \              /    \      
_/      \            /      \            /      \     
         \          /        \          /        \    
          \        /          \        /          \   
           \      /            \      /            \  
            \    /              \    /              \ 
             \  /                \  /                \
              \/                  \/                  
'@)
# Test 1
,(1,@'
____________________________________________________________
 Y             ||             YY             ||             
  \            ||            /  \            ||             
   \           ||           /    \           ||             
    \          ||    /\    /      \          ||  /\        /
     \    /\   ||   /  \  /        \      /\ |/\/  \      / 
      \  /  \  ||  /    \/          \    /  \/      \/\  /  
       \/    \ || /                  \  /              \/   
              \||/                    \/                    
               \/                                           
'@,@'
_                                                           
 \                            /\                            
  \                          /  \                           
   \                        /    \                          
    \                /\    /      \              /\        /
     \    /\        /  \  /        \      /\  /\/  \      / 
      \  /  \      /    \/          \    /  \/      \/\  /  
       \/    \    /                  \  /              \/   
              \  /                    \/                    
               \/                                           
'@)
# Test 3
,(3,@'
    /\                 
   /  \                
  /____\/\/\/\/\/\/\/\ 
_)____________________(
'@,@'
    /\                 
   /  \                
  /    \/\/\/\/\/\/\/\ 
_/                    \
'@)
# Test 4
,(4,@'
___________________________________________________
 Y           ||           YY          ||          Y
  \          ||          /  \         |/\        / 
   \         ||         /    \        /  \      /  
    \    /\  ||    /\  /      \      /    \    /   
     \  /  \ ||   /  \/        \    /      \  /    
      \/    \||  /              \  /        \/     
             \| /                \/                
              \/                                   
'@,@'
_                                                  
 \                        /\                      /
  \                      /  \          /\        / 
   \                    /    \        /  \      /  
    \    /\        /\  /      \      /    \    /   
     \  /  \      /  \/        \    /      \  /    
      \/    \    /              \  /        \/     
             \  /                \/                
              \/                                   
'@)
# Test 5
,(5,@'
                                                      /
                                                     / 
                                                    /__
___________________________________________________)___
 Y           ||           YY          ||          Y    
  \          ||          /  \         |/\        /     
   \         ||         /    \        /  \      /      
    \    /\  ||    /\  /      \      /    \    /       
     \  /  \ ||   /  \/        \    /      \  /        
      \/    \||  /              \  /        \/         
             \| /                \/                    
              \/                                       
'@,@'
                                                      /
                                                     / 
                                                    /  
_                                                  /   
 \                        /\                      /    
  \                      /  \          /\        /     
   \                    /    \        /  \      /      
    \    /\        /\  /      \      /    \    /       
     \  /  \      /  \/        \    /      \  /        
      \/    \    /              \  /        \/         
             \  /                \/                    
              \/                                       
'@)
# Test 6
,(6,@'
_______________________________)
 YYYYYYYYYYYYYYYYYYYYYYYYYYYYYY 
'@,@'
_                              /
 \/\/\/\/\/\/\/\/\/\/\/\/\/\/\/ 
'@)
# Test 7
,(7,@'
_________________________________)
 Y              ||              Y 
  \/\/\/\/\/\/\/\/\/\/\/\/\/\/\/  
'@,@'
_                                /
 \                              / 
  \/\/\/\/\/\/\/\/\/\/\/\/\/\/\/  
'@)
# Test 8
,(8,@'
      /\    /\    /\    /\    /\    /\ 
_)(__)__(__)__(__)__(__)__(__)__(__)__(
   YY    YY    YY    YY    YY    YY    
'@,@'
      /\    /\    /\    /\    /\    /\ 
_/\  /  \  /  \  /  \  /  \  /  \  /  \
   \/    \/    \/    \/    \/    \/    
'@)
# Test 9
,(9,@'
  /\/\/\/\/\/\/\/\ 
_)________________(
'@,@'
  /\/\/\/\/\/\/\/\ 
_/                \
'@)
# Test 10
,(10,@'
      /\                                                            /\                              
     /  \                                                          /  \                             
    /    \                                                        /    \                            
   /      \                                                      /      \                           
  /________\                                                    /________\/\/\/\/\                  
_)__________(__________________________________________________)__________________(______)(_________
             Y                       ||                       Y                    Y    Y  Y   ||   
              \                      ||    /\                /                      \  /    \  ||  /
               \    /\               ||   /  \              /                        \/      \ || / 
                \  /  \              ||  /    \            /                                  \||/  
                 \/    \             || /      \          /                                    \/   
                        \        /\  ||/        \        /                                          
                         \      /  \ |/          \      /                                           
                          \    /    \/            \    /                                            
                           \/\/                    \/\/                                             
'@,@'
      /\                                                            /\                              
     /  \                                                          /  \                             
    /    \                                                        /    \                            
   /      \                                                      /      \                           
  /        \                                                    /        \/\/\/\/\                  
_/          \                                                  /                  \      /\         
             \                                                /                    \    /  \        
              \                            /\                /                      \  /    \      /
               \    /\                    /  \              /                        \/      \    / 
                \  /  \                  /    \            /                                  \  /  
                 \/    \                /      \          /                                    \/   
                        \        /\    /        \        /                                          
                         \      /  \  /          \      /                                           
                          \    /    \/            \    /                                            
                           \/\/                    \/\/                                             
'@)
# Test 11
,(11,@'
__________________________________________________
 Y     ||     YY     ||     YY         ||         
  \    ||    /  \    ||    /  \        /\         
   \   ||   /    \   ||   /    \      /  \    /\  
    \  ||  /      \  ||  /      \    /    \  /  \/
     \ || /        \ || /        \  /      \/     
      \||/          \||/          \/              
       \/            \/                           
'@,@'
_                                                 
 \            /\            /\                    
  \          /  \          /  \        /\         
   \        /    \        /    \      /  \    /\  
    \      /      \      /      \    /    \  /  \/
     \    /        \    /        \  /      \/     
      \  /          \  /          \/              
       \/            \/                           
'@)
# Test 12
,(12,@'
                                           /\  /\                      
                                          /  \/  \                    /
           /\                            /        \  /\              / 
    /\    /  \                          /          \/  \            /  
   /  \  /    \/\                      /                \    /\    /   
  /____\/________\                    /__________________\  /__\  /____
_)________________(__________________)____________________()____()_____
                   Y       ||       Y                                  
                    \      ||    /\/                                   
                     \  /\ ||   /                                      
                      \/  \||  /                                       
                           \| /                                        
                            \/                                         
'@,@'
                                           /\  /\                      
                                          /  \/  \                    /
           /\                            /        \  /\              / 
    /\    /  \                          /          \/  \            /  
   /  \  /    \/\                      /                \    /\    /   
  /    \/        \                    /                  \  /  \  /    
_/                \                  /                    \/    \/     
                   \                /                                  
                    \            /\/                                   
                     \  /\      /                                      
                      \/  \    /                                       
                           \  /                                        
                            \/                                         
'@)
# Test 13
,(13,@'
_____________)(____________)(_____________________
 Y    ||    Y  Y    ||    Y  Y   ||   YY    ||    
  \   ||   /    \   ||   /    \  ||  /  \   |/\  /
   \  ||  /      \  ||  /      \ || /    \  /  \/ 
    \ || /        \ || /        \||/      \/      
     \||/          \||/          \/               
      \/            \/                            
'@,@'
_            /\            /\                     
 \          /  \          /  \        /\          
  \        /    \        /    \      /  \    /\  /
   \      /      \      /      \    /    \  /  \/ 
    \    /        \    /        \  /      \/      
     \  /          \  /          \/               
      \/            \/                            
'@)
# Test 14
,(14,@'
            /\            /\                    
___________)__(__________)__(________)(_________
 Y   ||   Y    Y   ||   Y    Y      Y  Y    YY  
  \  ||  /      \  ||  /      \    /    \  /  \/
   \ || /        \ || /        \  /      \/     
    \||/          \||/          \/              
     \/            \/                           
'@,@'
            /\            /\                    
_          /  \          /  \        /\         
 \        /    \        /    \      /  \    /\  
  \      /      \      /      \    /    \  /  \/
   \    /        \    /        \  /      \/     
    \  /          \  /          \/              
     \/            \/                           
'@)
# Test 15
,(15,@'
           /\            /\                    
          /__\          /__\        /\         
_________)____(________)____(______)__(____)(__
 Y      Y      Y      Y      Y    Y    Y  Y  YY
  \    /        \    /        \  /      \/     
   \  /          \  /          \/              
    \/            \/                           
'@,@'
           /\            /\                    
          /  \          /  \        /\         
_        /    \        /    \      /  \    /\  
 \      /      \      /      \    /    \  /  \/
  \    /        \    /        \  /      \/     
   \  /          \  /          \/              
    \/            \/                           
'@)
# Test 16
,(16,@'
          /\            /\                    
         /  \          /  \        /\         
        /____\        /____\      /__\    /\  
_______)______(______)______(____)____(__)__()
 Y    Y        Y    Y        Y  Y      YY     
  \  /          \  /          \/              
   \/            \/                           
'@,@'
          /\            /\                    
         /  \          /  \        /\         
        /    \        /    \      /  \    /\  
_      /      \      /      \    /    \  /  \/
 \    /        \    /        \  /      \/     
  \  /          \  /          \/              
   \/            \/                           
'@)
# Test 17
,(17,@'
         /\            /\                    
        /  \          /  \        /\         
       /    \        /    \      /  \    /\  
      /______\      /______\    /____\  /__\/
_____)________(____)________(__)______()_____
 Y  Y          Y  Y          YY              
  \/            \/                           
'@,@'
         /\            /\                    
        /  \          /  \        /\         
       /    \        /    \      /  \    /\  
      /      \      /      \    /    \  /  \/
_    /        \    /        \  /      \/     
 \  /          \  /          \/              
  \/            \/                           
'@)
# Test 18
,(18,@'
        /\            /\                    
       /  \          /  \        /\         
      /    \        /    \      /  \    /\  
     /      \      /      \    /    \  /  \/
    /________\    /________\  /______\/_____
___)__________(__)__________()______________
 YY            YY                           
'@,@'
        /\            /\                    
       /  \          /  \        /\         
      /    \        /    \      /  \    /\  
     /      \      /      \    /    \  /  \/
    /        \    /        \  /      \/     
_  /          \  /          \/              
 \/            \/                           
'@)
# Test 19
,(19,@'
       /\            /\                    
      /  \          /  \        /\         
     /    \        /    \      /  \    /\  
    /      \      /      \    /    \  /  \/
   /        \    /        \  /      \/     
  /__________\  /__________\/______________
_)____________()___________________________
'@,@'
       /\            /\                    
      /  \          /  \        /\         
     /    \        /    \      /  \    /\  
    /      \      /      \    /    \  /  \/
   /        \    /        \  /      \/     
  /          \  /          \/              
_/            \/                           
'@)
# Test 20
,(20,@'
__________________________________________________
 Y     ||     YY     ||     YY         ||         
  \    ||    /  \    ||    /  \        /\         
   \   ||   /    \   ||   /    \      /  \    /\  
    \  ||  /      \  ||  /      \    /    \  /  \ 
     \ || /        \ || /        \  /      \/    \
      \||/          \||/          \/              
       \/            \/                           
'@,@'
_                                                 
 \            /\            /\                    
  \          /  \          /  \        /\         
   \        /    \        /    \      /  \    /\  
    \      /      \      /      \    /    \  /  \ 
     \    /        \    /        \  /      \/    \
      \  /          \  /          \/              
       \/            \/                           
'@)
# Test 21
,(21,@'
      /\            /\                    
     /  \          /  \        /\         
    /    \        /    \      /  \    /\  
   /      \      /      \    /    \  /  \/
  /________\    /________\  /______\/_____
_)__________(__)__________()______________
             YY                           
'@,@'
      /\            /\                    
     /  \          /  \        /\         
    /    \        /    \      /  \    /\  
   /      \      /      \    /    \  /  \/
  /        \    /        \  /      \/     
_/          \  /          \/              
             \/                           
'@)
# Test 22
,(22,@'
     /\            /\                    
    /  \          /  \        /\         
   /    \        /    \      /  \    /\  
  /______\      /______\    /____\  /__\/
_)________(____)________(__)______()_____
           Y  Y          YY              
            \/                           
'@,@'
     /\            /\                    
    /  \          /  \        /\         
   /    \        /    \      /  \    /\  
  /      \      /      \    /    \  /  \/
_/        \    /        \  /      \/     
           \  /          \/              
            \/                           
'@)
# Test 23
,(23,@'
                         /\                                 
                        /  \                                
                   /\  /    \                               
            /\    /  \/      \                              
           /  \  /            \                  /\         
          /____\/______________\                /__\        
_________)______________________(________)(____)____(_______
 Y      Y                        Y      Y  Y  Y      Y  YY  
  \    /                          \    /    \/        \/  \/
   \  /                            \  /                     
    \/                              \/                      
'@,@'
                         /\                                 
                        /  \                                
                   /\  /    \                               
            /\    /  \/      \                              
           /  \  /            \                  /\         
          /    \/              \                /  \        
_        /                      \        /\    /    \       
 \      /                        \      /  \  /      \  /\  
  \    /                          \    /    \/        \/  \/
   \  /                            \  /                     
    \/                              \/                      
'@)
# Test 24
,(24,@'
    /\            /\                    
   /  \          /  \        /\         
  /____\        /____\      /__\    /\  
_)______(______)______(____)____(__)__()
         Y    Y        Y  Y      YY     
          \  /          \/              
           \/                           
'@,@'
    /\            /\                    
   /  \          /  \        /\         
  /    \        /    \      /  \    /\  
_/      \      /      \    /    \  /  \/
         \    /        \  /      \/     
          \  /          \/              
           \/                           
'@)
# Test 25
,(25,@'
   /\            /\                    
  /__\          /__\        /\         
_)____(________)____(______)__(____)(__
       Y      Y      Y    Y    Y  Y  YY
        \    /        \  /      \/     
         \  /          \/              
          \/                           
'@,@'
   /\            /\                    
  /  \          /  \        /\         
_/    \        /    \      /  \    /\  
       \      /      \    /    \  /  \/
        \    /        \  /      \/     
         \  /          \/              
          \/                           
'@)
# Test 26
,(26,@'
  /\            /\                    
_)__(__________)__(________)(_________
     Y   ||   Y    Y      Y  Y    YY  
      \  ||  /      \    /    \  /  \/
       \ || /        \  /      \/     
        \||/          \/              
         \/                           
'@,@'
  /\            /\                    
_/  \          /  \        /\         
     \        /    \      /  \    /\  
      \      /      \    /    \  /  \/
       \    /        \  /      \/     
        \  /          \/              
         \/                           
'@)
# Test 27
,(27,@'
_)(____________)(_____________________
   Y    ||    Y  Y   ||   YY    ||    
    \   ||   /    \  ||  /  \   |/\  /
     \  ||  /      \ || /    \  /  \/ 
      \ || /        \||/      \/      
       \||/          \/               
        \/                            
'@,@'
_/\            /\                     
   \          /  \        /\          
    \        /    \      /  \    /\  /
     \      /      \    /    \  /  \/ 
      \    /        \  /      \/      
       \  /          \/               
        \/                            
'@)
# Test 28
,(28,@'
____________________________________
 Y     ||     YY         ||         
  \    ||    /  \        /\         
   \   ||   /    \      /  \    /\  
    \  ||  /      \    /    \  /  \/
     \ || /        \  /      \/     
      \||/          \/              
       \/                           
'@,@'
_                                   
 \            /\                    
  \          /  \        /\         
   \        /    \      /  \    /\  
    \      /      \    /    \  /  \/
     \    /        \  /      \/     
      \  /          \/              
       \/                           
'@)
# Test 29
,(29,@'
_____________________________
 Y            ||            Y
  \        /\ || /\      /\/ 
   \  /\  /  \||/  \  /\/    
    \/  \/    \/    \/       
'@,@'
_                            
 \                          /
  \        /\    /\      /\/ 
   \  /\  /  \  /  \  /\/    
    \/  \/    \/    \/       
'@)
# Test 30
,(30,@'
_____
 Y  Y
  \/ 
'@,@'
_    
 \  /
  \/ 
'@)
# Test 31
,(31,@'
       /\    
    /\/__\   
___)______(__
 YY        YY
'@,@'
       /\    
    /\/  \   
_  /      \  
 \/        \/
'@)
# Test 32
,(32,@'
      /\     
     /  \    
    /____\   
___)______(__
 YY        YY
'@,@'
      /\     
     /  \    
    /    \   
_  /      \  
 \/        \/
'@)
# Test 33
,(33,@'
_______
 Y    Y
  \/\/ 
'@,@'
_      
 \    /
  \/\/ 
'@)
# Test 34
,(34,@'
_)()()()()()()()()()()()()()()()()()(
'@,@'
_/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
'@)
) | % {
    $num, $expected, $s = $_
    $result = &$f $s
    $passed=$result-eq$expected
    "$num : $passed"
    # $result           # uncomment this line to display results
    $pass+=$passed
    $count+=1
}
"$pass/$count passed."
```
Output:
```
2 : True
1 : True
3 : True
4 : True
5 : True
6 : True
7 : True
8 : True
9 : True
10 : True
11 : True
12 : True
13 : True
14 : True
15 : True
16 : True
17 : True
18 : True
19 : True
20 : True
21 : True
22 : True
23 : True
24 : True
25 : True
26 : True
27 : True
28 : True
29 : True
30 : True
31 : True
32 : True
33 : True
34 : True
34/34 passed.
```
Explanation comics:
```
Start here:
    /\                  /\                  /\        
   /  \                /  \                /  \       
  /    \              /    \              /    \      
_/      \            /      \            /      \     
         \          /        \          /        \    
          \        /          \        /          \   
           \      /            \      /            \  
            \    /              \    /              \ 
             \  /                \  /                \
              \/                  \/                  
Match and zoom it!
  /    \              /    \              /    \      $ceiling \
_/      \            /      \            /      \     $road    |  $outline
         \          /        \          /        \    $bottom  /
Start ceiling:
  /_   \              /_   \              /_   \      $ceiling \
_/      \            /      \            /      \     $road    |  $outline
         \          /        \          /        \    $bottom  /
Dig tunnels, build a road:
  /_   \              /_   \              /_   \      $ceiling \
_)______(____________)______(____________)______(_____$road    |  $outline
         \          /        \          /        \    $bottom  /
Attach to the road the top parts of pillars:
  /_   \              /_   \              /_   \      $ceiling \
_)______(____________)______(____________)______(_____$road    |  $outline
         \    ||    /        \    ||    /        \    $bottom  /
The road need support:
  /____\              /____\              /____\      $ceiling \
_)______(____________)______(____________)______(_____$road    |  $outline
         Y    ||    Y        Y    ||    Y        Y    $bottom  /
Put the road back into mountainous lands:
    /\                  /\                  /\        
   /  \                /  \                /  \       
  /_   \              /_   \              /_   \      $ceiling \
_)______(____________)______(____________)______(_____$road    |  $outline
         Y    ||    Y        Y    ||    Y        Y    $bottom  /
          \        /          \        /          \   
           \      /            \      /            \  
            \    /              \    /              \ 
             \  /                \  /                \
              \/                  \/                  
Build ceilings and build down pillars:
    /\                  /\                  /\        
   /  \                /  \                /  \       
  /__  \              /__  \              /__  \      
_)______(____________)______(____________)______(_____
         Y    ||    Y        Y    ||    Y        Y    
          \   ||   /          \   ||   /          \   
           \      /            \      /            \  
            \    /              \    /              \ 
             \  /                \  /                \
              \/                  \/                  
A few iterations later...
    /\                  /\                  /\        
   /  \                /  \                /  \       
  /____\              /____\              /____\      
_)______(____________)______(____________)______(_____
         Y    ||    Y        Y    ||    Y        Y    
          \   ||   /          \   ||   /          \   
           \  ||  /            \  ||  /            \  
            \ || /              \ || /              \ 
             \||/                \||/                \
              \/                  \/                  
Thanks. But our princess is in another castle!
```
]