Created
September 26, 2016 16:20
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| <?php | |
| $s = array(); | |
| define("SYMBOL",0); | |
| define("OFFSET",1); | |
| for($n = 1;$n<30;$n++){ | |
| $symbol = $n; | |
| if($n > 10){ | |
| $symbol = chr(54+$n); | |
| } | |
| $s[] = array(SYMBOL=>$symbol,OFFSET=>$n+1); | |
| $i = 0; | |
| $count = count($s)*2; | |
| $CC = 0; | |
| foreach (permutations($s) as $permutation) { | |
| $CC++; | |
| if($CC > 10000000) break; | |
| if($N = getN($permutation)){ | |
| $i++; | |
| break; | |
| } | |
| } | |
| if(!$N){$N = "Neexistuje take";} | |
| echo date("H:i:s")." ".$n.":".$CC.":".$N."\n"; | |
| } | |
| function permutations(array $elements){ | |
| if (count($elements) <= 1) { | |
| yield $elements; | |
| } else { | |
| foreach (permutations(array_slice($elements, 1)) as $permutation) { | |
| foreach (range(0, count($elements) - 1) as $i) { | |
| yield array_merge( | |
| array_slice($permutation, 0, $i), | |
| [$elements[0]], | |
| array_slice($permutation, $i) | |
| ); | |
| } | |
| } | |
| } | |
| } | |
| function getN($s){ | |
| global $count; | |
| $N = array(); | |
| for($i = 0;count($s) > 0 && $i<$count;$i++){ | |
| if(isset($N[$i])) continue; | |
| $currsymbol = array_pop($s); | |
| if(isset($N[$i+$currsymbol[OFFSET]])) return false;//the binded number is taken | |
| $N[$i] = $currsymbol[SYMBOL]; | |
| if($i+$currsymbol[OFFSET]>=$count) return false; | |
| $N[$i+$currsymbol[OFFSET]] = $currsymbol[SYMBOL]; | |
| } | |
| ksort($N); | |
| $ret = ""; | |
| foreach($N as $v){ | |
| $ret.=$v; | |
| } | |
| return $ret; | |
| } | |
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