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| author | Kartik K. Agaram <vc@akkartik.com> | 2017-09-24 23:25:42 -0700 |
|---|---|---|
| committer | Kartik K. Agaram <vc@akkartik.com> | 2017-09-24 23:25:42 -0700 |
| commit | 947c639ec646b67d1e434759a80eebfffedafe8d (patch) | |
| tree | 9d631e7961f97c5c3662ad64f0cd8bc38c8120bb | |
| parent | 925b20c497bf6be4768662ff39b0f5f1506a16ed (diff) | |
| download | mu-947c639ec646b67d1e434759a80eebfffedafe8d.tar.gz | |
4005
https://www.reddit.com/r/ProgrammingLanguages/comments/727va7/a_comparison_of_lisps/dnh2q6u
| -rw-r--r-- | html/nqueens.mu.html | 202 | ||||
| -rw-r--r-- | nqueens.mu | 4 |
2 files changed, 107 insertions, 99 deletions
diff --git a/html/nqueens.mu.html b/html/nqueens.mu.html index 0e10c100..6180c160 100644 --- a/html/nqueens.mu.html +++ b/html/nqueens.mu.html @@ -59,105 +59,109 @@ if ('onhashchange' in window) { </head> <body onload='JumpToLine();'> <pre id='vimCodeElement'> -<span id="L1" class="LineNr"> 1 </span><span class="Comment"># <a href="http://rosettacode.org/wiki/N-queens_problem">http://rosettacode.org/wiki/N-queens_problem</a></span> -<span id="L2" class="LineNr"> 2 </span><span class="Comment"># port of the Arc solution at <a href="http://arclanguage.org/item?id=19743">http://arclanguage.org/item?id=19743</a></span> -<span id="L3" class="LineNr"> 3 </span><span class="Comment"># run with tracing turned on:</span> -<span id="L4" class="LineNr"> 4 </span><span class="Comment"># ./mu --trace nqueens.mu</span> -<span id="L5" class="LineNr"> 5 </span> -<span id="L6" class="LineNr"> 6 </span><span class="muData">container</span> <a href='nqueens.mu.html#L6'>square</a> [ -<span id="L7" class="LineNr"> 7 </span> rank:num -<span id="L8" class="LineNr"> 8 </span> file:num -<span id="L9" class="LineNr"> 9 </span>] -<span id="L10" class="LineNr">10 </span> -<span id="L11" class="LineNr">11 </span><span class="muRecipe">def</span> <a href='nqueens.mu.html#L11'>nqueens</a> n:num, queens:&:<a href='064list.mu.html#L6'>list</a>:<a href='nqueens.mu.html#L6'>square</a><span class="muRecipe"> -> </span>result:num, queens:&:<a href='064list.mu.html#L6'>list</a>:<a href='nqueens.mu.html#L6'>square</a> [ -<span id="L12" class="LineNr">12 </span> <span class="Constant">local-scope</span> -<span id="L13" class="LineNr">13 </span> <span class="Constant">load-ingredients</span> -<span id="L14" class="LineNr">14 </span> <span class="Comment"># if 'queens' is already long enough, print it and return</span> -<span id="L15" class="LineNr">15 </span> added-so-far:num <span class="Special"><-</span> length queens -<span id="L16" class="LineNr">16 </span> <span class="Delimiter">{</span> -<span id="L17" class="LineNr">17 </span> <span class="Conceal">¦</span> done?:bool <span class="Special"><-</span> greater-or-equal added-so-far, n -<span id="L18" class="LineNr">18 </span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> done? -<span id="L19" class="LineNr">19 </span> <span class="Conceal">¦</span> stash queens -<span id="L20" class="LineNr">20 </span> <span class="Conceal">¦</span> <span class="muControl">return</span><span class="Constant"> 1</span> -<span id="L21" class="LineNr">21 </span> <span class="Delimiter">}</span> -<span id="L22" class="LineNr">22 </span> <span class="Comment"># still work to do</span> -<span id="L23" class="LineNr">23 </span> next-rank:num <span class="Special"><-</span> copy<span class="Constant"> 0</span> -<span id="L24" class="LineNr">24 </span> <span class="Delimiter">{</span> -<span id="L25" class="LineNr">25 </span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> queens -<span id="L26" class="LineNr">26 </span> <span class="Conceal">¦</span> first:<a href='nqueens.mu.html#L6'>square</a> <span class="Special"><-</span> first queens -<span id="L27" class="LineNr">27 </span> <span class="Conceal">¦</span> existing-rank:num <span class="Special"><-</span> get first, <span class="Constant">rank:offset</span> -<span id="L28" class="LineNr">28 </span> <span class="Conceal">¦</span> next-rank <span class="Special"><-</span> add existing-rank,<span class="Constant"> 1</span> -<span id="L29" class="LineNr">29 </span> <span class="Delimiter">}</span> -<span id="L30" class="LineNr">30 </span> result <span class="Special"><-</span> copy<span class="Constant"> 0</span> -<span id="L31" class="LineNr">31 </span> next-file:num <span class="Special"><-</span> copy<span class="Constant"> 0</span> -<span id="L32" class="LineNr">32 </span> <span class="Delimiter">{</span> -<span id="L33" class="LineNr">33 </span> <span class="Conceal">¦</span> done?:bool <span class="Special"><-</span> greater-or-equal next-file, n -<span id="L34" class="LineNr">34 </span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> done? -<span id="L35" class="LineNr">35 </span> <span class="Conceal">¦</span> curr:<a href='nqueens.mu.html#L6'>square</a> <span class="Special"><-</span> merge next-rank, next-file -<span id="L36" class="LineNr">36 </span> <span class="Conceal">¦</span> <span class="Delimiter">{</span> -<span id="L37" class="LineNr">37 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> curr-conflicts?:bool <span class="Special"><-</span> <a href='nqueens.mu.html#L49'>conflict?</a> curr, queens -<span id="L38" class="LineNr">38 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> curr-conflicts? -<span id="L39" class="LineNr">39 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> queens:&:<a href='064list.mu.html#L6'>list</a>:<a href='nqueens.mu.html#L6'>square</a> <span class="Special"><-</span> push curr, queens -<span id="L40" class="LineNr">40 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> sub-result:num <span class="Special"><-</span> <a href='nqueens.mu.html#L11'>nqueens</a> n, queens -<span id="L41" class="LineNr">41 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> result <span class="Special"><-</span> add result, sub-result -<span id="L42" class="LineNr">42 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> queens <span class="Special"><-</span> <a href='064list.mu.html#L25'>rest</a> queens -<span id="L43" class="LineNr">43 </span> <span class="Conceal">¦</span> <span class="Delimiter">}</span> -<span id="L44" class="LineNr">44 </span> <span class="Conceal">¦</span> next-file <span class="Special"><-</span> add next-file,<span class="Constant"> 1</span> -<span id="L45" class="LineNr">45 </span> <span class="Conceal">¦</span> <span class="muControl">loop</span> -<span id="L46" class="LineNr">46 </span> <span class="Delimiter">}</span> -<span id="L47" class="LineNr">47 </span>] -<span id="L48" class="LineNr">48 </span> -<span id="L49" class="LineNr">49 </span><span class="muRecipe">def</span> <a href='nqueens.mu.html#L49'>conflict?</a> curr:<a href='nqueens.mu.html#L6'>square</a>, queens:&:<a href='064list.mu.html#L6'>list</a>:<a href='nqueens.mu.html#L6'>square</a><span class="muRecipe"> -> </span>result:bool [ -<span id="L50" class="LineNr">50 </span> <span class="Constant">local-scope</span> -<span id="L51" class="LineNr">51 </span> <span class="Constant">load-ingredients</span> -<span id="L52" class="LineNr">52 </span> result1:bool <span class="Special"><-</span> <a href='nqueens.mu.html#L58'>conflicting-file?</a> curr, queens -<span id="L53" class="LineNr">53 </span> <span class="muControl">return-if</span> result1, result1 -<span id="L54" class="LineNr">54 </span> result2:bool <span class="Special"><-</span> <a href='nqueens.mu.html#L74'>conflicting-diagonal?</a> curr, queens -<span id="L55" class="LineNr">55 </span> <span class="muControl">return</span> result2 -<span id="L56" class="LineNr">56 </span>] -<span id="L57" class="LineNr">57 </span> -<span id="L58" class="LineNr">58 </span><span class="muRecipe">def</span> <a href='nqueens.mu.html#L58'>conflicting-file?</a> curr:<a href='nqueens.mu.html#L6'>square</a>, queens:&:<a href='064list.mu.html#L6'>list</a>:<a href='nqueens.mu.html#L6'>square</a><span class="muRecipe"> -> </span>result:bool [ -<span id="L59" class="LineNr">59 </span> <span class="Constant">local-scope</span> -<span id="L60" class="LineNr">60 </span> <span class="Constant">load-ingredients</span> -<span id="L61" class="LineNr">61 </span> curr-file:num <span class="Special"><-</span> get curr, <span class="Constant">file:offset</span> -<span id="L62" class="LineNr">62 </span> <span class="Delimiter">{</span> -<span id="L63" class="LineNr">63 </span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> queens -<span id="L64" class="LineNr">64 </span> <span class="Conceal">¦</span> q:<a href='nqueens.mu.html#L6'>square</a> <span class="Special"><-</span> first queens -<span id="L65" class="LineNr">65 </span> <span class="Conceal">¦</span> qfile:num <span class="Special"><-</span> get q, <span class="Constant">file:offset</span> -<span id="L66" class="LineNr">66 </span> <span class="Conceal">¦</span> file-match?:bool <span class="Special"><-</span> equal curr-file, qfile -<span id="L67" class="LineNr">67 </span> <span class="Conceal">¦</span> <span class="muControl">return-if</span> file-match?, <span class="Constant">1/conflict-found</span> -<span id="L68" class="LineNr">68 </span> <span class="Conceal">¦</span> queens <span class="Special"><-</span> <a href='064list.mu.html#L25'>rest</a> queens -<span id="L69" class="LineNr">69 </span> <span class="Conceal">¦</span> <span class="muControl">loop</span> -<span id="L70" class="LineNr">70 </span> <span class="Delimiter">}</span> -<span id="L71" class="LineNr">71 </span> <span class="muControl">return</span> <span class="Constant">0/no-conflict-found</span> -<span id="L72" class="LineNr">72 </span>] -<span id="L73" class="LineNr">73 </span> -<span id="L74" class="LineNr">74 </span><span class="muRecipe">def</span> <a href='nqueens.mu.html#L74'>conflicting-diagonal?</a> curr:<a href='nqueens.mu.html#L6'>square</a>, queens:&:<a href='064list.mu.html#L6'>list</a>:<a href='nqueens.mu.html#L6'>square</a><span class="muRecipe"> -> </span>result:bool [ -<span id="L75" class="LineNr">75 </span> <span class="Constant">local-scope</span> -<span id="L76" class="LineNr">76 </span> <span class="Constant">load-ingredients</span> -<span id="L77" class="LineNr">77 </span> curr-rank:num <span class="Special"><-</span> get curr, <span class="Constant">rank:offset</span> -<span id="L78" class="LineNr">78 </span> curr-file:num <span class="Special"><-</span> get curr, <span class="Constant">file:offset</span> -<span id="L79" class="LineNr">79 </span> <span class="Delimiter">{</span> -<span id="L80" class="LineNr">80 </span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> queens -<span id="L81" class="LineNr">81 </span> <span class="Conceal">¦</span> q:<a href='nqueens.mu.html#L6'>square</a> <span class="Special"><-</span> first queens -<span id="L82" class="LineNr">82 </span> <span class="Conceal">¦</span> qrank:num <span class="Special"><-</span> get q, <span class="Constant">rank:offset</span> -<span id="L83" class="LineNr">83 </span> <span class="Conceal">¦</span> qfile:num <span class="Special"><-</span> get q, <span class="Constant">file:offset</span> -<span id="L84" class="LineNr">84 </span> <span class="Conceal">¦</span> rank-delta:num <span class="Special"><-</span> subtract qrank, curr-rank -<span id="L85" class="LineNr">85 </span> <span class="Conceal">¦</span> file-delta:num <span class="Special"><-</span> subtract qfile, curr-file -<span id="L86" class="LineNr">86 </span> <span class="Conceal">¦</span> rank-delta <span class="Special"><-</span> <a href='070table.mu.html#L103'>abs</a> rank-delta -<span id="L87" class="LineNr">87 </span> <span class="Conceal">¦</span> file-delta <span class="Special"><-</span> <a href='070table.mu.html#L103'>abs</a> file-delta -<span id="L88" class="LineNr">88 </span> <span class="Conceal">¦</span> diagonal-match?:bool <span class="Special"><-</span> equal rank-delta, file-delta -<span id="L89" class="LineNr">89 </span> <span class="Conceal">¦</span> <span class="muControl">return-if</span> diagonal-match?, <span class="Constant">1/conflict-found</span> -<span id="L90" class="LineNr">90 </span> <span class="Conceal">¦</span> queens <span class="Special"><-</span> <a href='064list.mu.html#L25'>rest</a> queens -<span id="L91" class="LineNr">91 </span> <span class="Conceal">¦</span> <span class="muControl">loop</span> -<span id="L92" class="LineNr">92 </span> <span class="Delimiter">}</span> -<span id="L93" class="LineNr">93 </span> <span class="muControl">return</span> <span class="Constant">0/no-conflict-found</span> -<span id="L94" class="LineNr">94 </span>] -<span id="L95" class="LineNr">95 </span> -<span id="L96" class="LineNr">96 </span><span class="muRecipe">def</span> <a href='nqueens.mu.html#L96'>main</a> [ -<span id="L97" class="LineNr">97 </span> <a href='nqueens.mu.html#L11'>nqueens</a><span class="Constant"> 4</span> -<span id="L98" class="LineNr">98 </span> $dump-trace <span class="Constant">[app]</span> -<span id="L99" class="LineNr">99 </span>] +<span id="L1" class="LineNr"> 1 </span><span class="Comment"># <a href="http://rosettacode.org/wiki/N-queens_problem">http://rosettacode.org/wiki/N-queens_problem</a></span> +<span id="L2" class="LineNr"> 2 </span><span class="Comment"># port of the Arc solution at <a href="http://arclanguage.org/item?id=19743">http://arclanguage.org/item?id=19743</a></span> +<span id="L3" class="LineNr"> 3 </span><span class="Comment"># run with tracing turned on:</span> +<span id="L4" class="LineNr"> 4 </span><span class="Comment"># ./mu --trace nqueens.mu</span> +<span id="L5" class="LineNr"> 5 </span> +<span id="L6" class="LineNr"> 6 </span><span class="muData">container</span> <a href='nqueens.mu.html#L6'>square</a> [ +<span id="L7" class="LineNr"> 7 </span> rank:num +<span id="L8" class="LineNr"> 8 </span> file:num +<span id="L9" class="LineNr"> 9 </span>] +<span id="L10" class="LineNr"> 10 </span> +<span id="L11" class="LineNr"> 11 </span><span class="muRecipe">def</span> <a href='nqueens.mu.html#L11'>nqueens</a> n:num, queens:&:<a href='064list.mu.html#L6'>list</a>:<a href='nqueens.mu.html#L6'>square</a><span class="muRecipe"> -> </span>result:num, queens:&:<a href='064list.mu.html#L6'>list</a>:<a href='nqueens.mu.html#L6'>square</a> [ +<span id="L12" class="LineNr"> 12 </span> <span class="Constant">local-scope</span> +<span id="L13" class="LineNr"> 13 </span> <span class="Constant">load-ingredients</span> +<span id="L14" class="LineNr"> 14 </span> <span class="Comment"># if 'queens' is already long enough, print it and return</span> +<span id="L15" class="LineNr"> 15 </span> added-so-far:num <span class="Special"><-</span> length queens +<span id="L16" class="LineNr"> 16 </span> <span class="Delimiter">{</span> +<span id="L17" class="LineNr"> 17 </span> <span class="Conceal">¦</span> done?:bool <span class="Special"><-</span> greater-or-equal added-so-far, n +<span id="L18" class="LineNr"> 18 </span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> done? +<span id="L19" class="LineNr"> 19 </span> <span class="Conceal">¦</span> stash queens +<span id="L20" class="LineNr"> 20 </span> <span class="Conceal">¦</span> <span class="muControl">return</span><span class="Constant"> 1</span> +<span id="L21" class="LineNr"> 21 </span> <span class="Delimiter">}</span> +<span id="L22" class="LineNr"> 22 </span> <span class="Comment"># still work to do</span> +<span id="L23" class="LineNr"> 23 </span> next-rank:num <span class="Special"><-</span> copy<span class="Constant"> 0</span> +<span id="L24" class="LineNr"> 24 </span> <span class="Delimiter">{</span> +<span id="L25" class="LineNr"> 25 </span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> queens +<span id="L26" class="LineNr"> 26 </span> <span class="Conceal">¦</span> first:<a href='nqueens.mu.html#L6'>square</a> <span class="Special"><-</span> first queens +<span id="L27" class="LineNr"> 27 </span> <span class="Conceal">¦</span> existing-rank:num <span class="Special"><-</span> get first, <span class="Constant">rank:offset</span> +<span id="L28" class="LineNr"> 28 </span> <span class="Conceal">¦</span> next-rank <span class="Special"><-</span> add existing-rank,<span class="Constant"> 1</span> +<span id="L29" class="LineNr"> 29 </span> <span class="Delimiter">}</span> +<span id="L30" class="LineNr"> 30 </span> result <span class="Special"><-</span> copy<span class="Constant"> 0</span> +<span id="L31" class="LineNr"> 31 </span> next-file:num <span class="Special"><-</span> copy<span class="Constant"> 0</span> +<span id="L32" class="LineNr"> 32 </span> <span class="Delimiter">{</span> +<span id="L33" class="LineNr"> 33 </span> <span class="Conceal">¦</span> done?:bool <span class="Special"><-</span> greater-or-equal next-file, n +<span id="L34" class="LineNr"> 34 </span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> done? +<span id="L35" class="LineNr"> 35 </span> <span class="Conceal">¦</span> curr:<a href='nqueens.mu.html#L6'>square</a> <span class="Special"><-</span> merge next-rank, next-file +<span id="L36" class="LineNr"> 36 </span> <span class="Conceal">¦</span> <span class="Delimiter">{</span> +<span id="L37" class="LineNr"> 37 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> curr-conflicts?:bool <span class="Special"><-</span> <a href='nqueens.mu.html#L53'>conflict?</a> curr, queens +<span id="L38" class="LineNr"> 38 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> curr-conflicts? +<span id="L39" class="LineNr"> 39 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> queens:&:<a href='064list.mu.html#L6'>list</a>:<a href='nqueens.mu.html#L6'>square</a> <span class="Special"><-</span> push curr, queens +<span id="L40" class="LineNr"> 40 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> sub-result:num <span class="Special"><-</span> <a href='nqueens.mu.html#L11'>nqueens</a> n, queens +<span id="L41" class="LineNr"> 41 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> result <span class="Special"><-</span> add result, sub-result +<span id="L42" class="LineNr"> 42 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> queens <span class="Special"><-</span> <a href='064list.mu.html#L25'>rest</a> queens +<span id="L43" class="LineNr"> 43 </span> <span class="Conceal">¦</span> <span class="Delimiter">}</span> +<span id="L44" class="LineNr"> 44 </span> <span class="Conceal">¦</span> next-file <span class="Special"><-</span> add next-file,<span class="Constant"> 1</span> +<span id="L45" class="LineNr"> 45 </span> <span class="Conceal">¦</span> <span class="muControl">loop</span> +<span id="L46" class="LineNr"> 46 </span> <span class="Delimiter">}</span> +<span id="L47" class="LineNr"> 47 </span>] +<span id="L48" class="LineNr"> 48 </span> +<span id="L49" class="LineNr"> 49 </span><span class="Comment"># check if putting a queen on 'curr' conflicts with any of the existing</span> +<span id="L50" class="LineNr"> 50 </span><span class="Comment"># queens</span> +<span id="L51" class="LineNr"> 51 </span><span class="Comment"># assumes that 'curr' is on a non-conflicting rank, and checks for conflict</span> +<span id="L52" class="LineNr"> 52 </span><span class="Comment"># only in files and diagonals</span> +<span id="L53" class="LineNr"> 53 </span><span class="muRecipe">def</span> <a href='nqueens.mu.html#L53'>conflict?</a> curr:<a href='nqueens.mu.html#L6'>square</a>, queens:&:<a href='064list.mu.html#L6'>list</a>:<a href='nqueens.mu.html#L6'>square</a><span class="muRecipe"> -> </span>result:bool [ +<span id="L54" class="LineNr"> 54 </span> <span class="Constant">local-scope</span> +<span id="L55" class="LineNr"> 55 </span> <span class="Constant">load-ingredients</span> +<span id="L56" class="LineNr"> 56 </span> result1:bool <span class="Special"><-</span> <a href='nqueens.mu.html#L62'>conflicting-file?</a> curr, queens +<span id="L57" class="LineNr"> 57 </span> <span class="muControl">return-if</span> result1, result1 +<span id="L58" class="LineNr"> 58 </span> result2:bool <span class="Special"><-</span> <a href='nqueens.mu.html#L78'>conflicting-diagonal?</a> curr, queens +<span id="L59" class="LineNr"> 59 </span> <span class="muControl">return</span> result2 +<span id="L60" class="LineNr"> 60 </span>] +<span id="L61" class="LineNr"> 61 </span> +<span id="L62" class="LineNr"> 62 </span><span class="muRecipe">def</span> <a href='nqueens.mu.html#L62'>conflicting-file?</a> curr:<a href='nqueens.mu.html#L6'>square</a>, queens:&:<a href='064list.mu.html#L6'>list</a>:<a href='nqueens.mu.html#L6'>square</a><span class="muRecipe"> -> </span>result:bool [ +<span id="L63" class="LineNr"> 63 </span> <span class="Constant">local-scope</span> +<span id="L64" class="LineNr"> 64 </span> <span class="Constant">load-ingredients</span> +<span id="L65" class="LineNr"> 65 </span> curr-file:num <span class="Special"><-</span> get curr, <span class="Constant">file:offset</span> +<span id="L66" class="LineNr"> 66 </span> <span class="Delimiter">{</span> +<span id="L67" class="LineNr"> 67 </span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> queens +<span id="L68" class="LineNr"> 68 </span> <span class="Conceal">¦</span> q:<a href='nqueens.mu.html#L6'>square</a> <span class="Special"><-</span> first queens +<span id="L69" class="LineNr"> 69 </span> <span class="Conceal">¦</span> qfile:num <span class="Special"><-</span> get q, <span class="Constant">file:offset</span> +<span id="L70" class="LineNr"> 70 </span> <span class="Conceal">¦</span> file-match?:bool <span class="Special"><-</span> equal curr-file, qfile +<span id="L71" class="LineNr"> 71 </span> <span class="Conceal">¦</span> <span class="muControl">return-if</span> file-match?, <span class="Constant">1/conflict-found</span> +<span id="L72" class="LineNr"> 72 </span> <span class="Conceal">¦</span> queens <span class="Special"><-</span> <a href='064list.mu.html#L25'>rest</a> queens +<span id="L73" class="LineNr"> 73 </span> <span class="Conceal">¦</span> <span class="muControl">loop</span> +<span id="L74" class="LineNr"> 74 </span> <span class="Delimiter">}</span> +<span id="L75" class="LineNr"> 75 </span> <span class="muControl">return</span> <span class="Constant">0/no-conflict-found</span> +<span id="L76" class="LineNr"> 76 </span>] +<span id="L77" class="LineNr"> 77 </span> +<span id="L78" class="LineNr"> 78 </span><span class="muRecipe">def</span> <a href='nqueens.mu.html#L78'>conflicting-diagonal?</a> curr:<a href='nqueens.mu.html#L6'>square</a>, queens:&:<a href='064list.mu.html#L6'>list</a>:<a href='nqueens.mu.html#L6'>square</a><span class="muRecipe"> -> </span>result:bool [ +<span id="L79" class="LineNr"> 79 </span> <span class="Constant">local-scope</span> +<span id="L80" class="LineNr"> 80 </span> <span class="Constant">load-ingredients</span> +<span id="L81" class="LineNr"> 81 </span> curr-rank:num <span class="Special"><-</span> get curr, <span class="Constant">rank:offset</span> +<span id="L82" class="LineNr"> 82 </span> curr-file:num <span class="Special"><-</span> get curr, <span class="Constant">file:offset</span> +<span id="L83" class="LineNr"> 83 </span> <span class="Delimiter">{</span> +<span id="L84" class="LineNr"> 84 </span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> queens +<span id="L85" class="LineNr"> 85 </span> <span class="Conceal">¦</span> q:<a href='nqueens.mu.html#L6'>square</a> <span class="Special"><-</span> first queens +<span id="L86" class="LineNr"> 86 </span> <span class="Conceal">¦</span> qrank:num <span class="Special"><-</span> get q, <span class="Constant">rank:offset</span> +<span id="L87" class="LineNr"> 87 </span> <span class="Conceal">¦</span> qfile:num <span class="Special"><-</span> get q, <span class="Constant">file:offset</span> +<span id="L88" class="LineNr"> 88 </span> <span class="Conceal">¦</span> rank-delta:num <span class="Special"><-</span> subtract qrank, curr-rank +<span id="L89" class="LineNr"> 89 </span> <span class="Conceal">¦</span> file-delta:num <span class="Special"><-</span> subtract qfile, curr-file +<span id="L90" class="LineNr"> 90 </span> <span class="Conceal">¦</span> rank-delta <span class="Special"><-</span> <a href='070table.mu.html#L103'>abs</a> rank-delta +<span id="L91" class="LineNr"> 91 </span> <span class="Conceal">¦</span> file-delta <span class="Special"><-</span> <a href='070table.mu.html#L103'>abs</a> file-delta +<span id="L92" class="LineNr"> 92 </span> <span class="Conceal">¦</span> diagonal-match?:bool <span class="Special"><-</span> equal rank-delta, file-delta +<span id="L93" class="LineNr"> 93 </span> <span class="Conceal">¦</span> <span class="muControl">return-if</span> diagonal-match?, <span class="Constant">1/conflict-found</span> +<span id="L94" class="LineNr"> 94 </span> <span class="Conceal">¦</span> queens <span class="Special"><-</span> <a href='064list.mu.html#L25'>rest</a> queens +<span id="L95" class="LineNr"> 95 </span> <span class="Conceal">¦</span> <span class="muControl">loop</span> +<span id="L96" class="LineNr"> 96 </span> <span class="Delimiter">}</span> +<span id="L97" class="LineNr"> 97 </span> <span class="muControl">return</span> <span class="Constant">0/no-conflict-found</span> +<span id="L98" class="LineNr"> 98 </span>] +<span id="L99" class="LineNr"> 99 </span> +<span id="L100" class="LineNr">100 </span><span class="muRecipe">def</span> <a href='nqueens.mu.html#L100'>main</a> [ +<span id="L101" class="LineNr">101 </span> <a href='nqueens.mu.html#L11'>nqueens</a><span class="Constant"> 4</span> +<span id="L102" class="LineNr">102 </span> $dump-trace <span class="Constant">[app]</span> +<span id="L103" class="LineNr">103 </span>] </pre> </body> </html> diff --git a/nqueens.mu b/nqueens.mu index 95955784..87ce90b6 100644 --- a/nqueens.mu +++ b/nqueens.mu @@ -46,6 +46,10 @@ def nqueens n:num, queens:&:list:square -> result:num, queens:&:list:square [ } ] +# check if putting a queen on 'curr' conflicts with any of the existing +# queens +# assumes that 'curr' is on a non-conflicting rank, and checks for conflict +# only in files and diagonals def conflict? curr:square, queens:&:list:square -> result:bool [ local-scope load-ingredients |