plop
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commit
3577f6f482
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README.md
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README.md
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Chanllenge rules are there: http://codegolf.stackexchange.com/questions/57952/where-is-the-arrow-pointing
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input.txt
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input.txt
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+-------+ +-------+--+-------+ +------+
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| | | +-+ | | | | ++
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| +----+ | | | | | +----+ | +-+ |
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| | | | | | | | | | | |
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| +--+ | +-+ ++ | +--+ | | | |
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S----+ | | +--+ | | | | | +--->B
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| +--+ | +-+ ++ | +--+ | | | |
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| | | | | | | | | | | |
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| | | | | | | +----+ | +-+ |
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| | | | | | | | | ++
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+--+-------+--+ +--+ +-------+--+------+
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resolver.php
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resolver.php
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<?php
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/*
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* By Gnieark https://blog-du-grouik.tinad.fr oct 2015
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* Anwser to "code golf" http://codegolf.stackexchange.com/questions/57952/where-is-the-arrow-pointing in PHP
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*/
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//ouvrir le fichier contenant la "carte et l'envoyer dans un array 2 dimmension
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$mapLines=explode("\n",file_get_contents('./input.txt'));
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$i=0;
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foreach($mapLines as $ligne){
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$map[$i]=str_split($ligne,1);
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if((!isset($y)) && in_array('S',$map[$i])){
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//tant qu'à parcourir la carte, on cherche le "S" s'il n'a pas déjà été trouvé.
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$y=$i;
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$x=array_search('S',$map[$i]);
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}
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$i++;
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}
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if(!isset($y)){
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echo "Il n'y a pas de départ S dans ce parcours";
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die;
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}
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echo "\n".file_get_contents('./input.txt')."\nLe départ est aux positions ".$map[$y][$x]." [".$x.",".$y."]. Démarrage du script...\n";
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$previousX=-1; // Contiendra l'ordonnée de la position précédente. (pour le moment, une valeur incohérente)
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$previousY=-1; // Contiendra l'absycede la position précédente. (pour le moment, une valeur incohérente)
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$previousCrosses=array(); //On ne gardera en mémoire que les croisements, pas l'ensemble du chemin.
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while(1==1){ // C'est un défi de codagee, pas un script qui sera en prod. j'assume.
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switch($map[$y][$x]){
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case "S":
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//même fonction que "+"
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case "+":
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//on peut aller dans les 4 directions
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$target=whereToGoAfterCross($x,$y,$previousX,$previousY);
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if($target){
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go($target[0],$target[1]);
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}else{
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goToPreviousCross();
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}
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break;
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case "s":
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goToPreviousCross();
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break;
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case "-":
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//déplacement horizontal
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if($previousX < $x){
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//vers la droite
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$targetX=$x+1;
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if(in_array($map[$y][$targetX],array('-','+','S','>','^','V'))){
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go($targetX,$y);
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}else{
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//On est dans un cul de sac
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goToPreviousCross();
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}
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}else{
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//vers la gauche
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$targetX=$x-1;
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if(in_array($map[$y][$targetX],array('-','+','S','<','^','V'))){
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go($targetX,$y);
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}else{
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//On est dans un cul de sac
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goToPreviousCross();
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}
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}
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break;
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case "|":
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//déplacement vertical
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if($previousY < $y){
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//on descend (/!\ y augmente vers le bas de la carte)
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$targetY=$y+1;
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if(in_array($map[$targetY][$x],array('|','+','S','>','<','V'))){
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go ($x,$targetY);
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}else{
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goToPreviousCross();
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}
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}else{
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//on Monte (/!\ y augmente vers le bas de la carte)
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$targetY=$y - 1;
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if(in_array($map[$targetY][$x],array('|','+','S','>','<','V'))){
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go ($x,$targetY);
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}else{
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goToPreviousCross();
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}
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}
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break;
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case "^":
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case "V":
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case ">":
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case "<":
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wheAreOnAnArrow($map[$y][$x]);
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break;
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}
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}
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function wheAreOnAnArrow($arrow){
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global $x,$y,$xMax,$yMax,$map;
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switch($arrow){
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case "^":
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$targetX=$x;
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$targetY=$y -1;
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$charsOfTheLoose=array(" ","V","-","s");
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break;
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case "V":
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$targetX=$x;
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$targetY=$y + 1;
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$charsOfTheLoose=array(" ","^","-","s");
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break;
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case ">":
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$targetX=$x + 1;
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$targetY=$y;
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$charsOfTheLoose=array(" ","<","|","s");
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break;
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case "<":
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$targetX=$x - 1;
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$targetY=$y;
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$charsOfTheLoose=array(" ",">","|","s");
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break;
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default:
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break;
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}
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if((!isset($map[$targetY][$targetX])) OR (in_array($map[$targetY][$targetX],$charsOfTheLoose))){
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//on sort du cadre ou on tombe sur un caractere inadapté
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goToPreviousCross();
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}else{
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if(preg_match("/^[a-z]$/",strtolower($map[$targetY][$targetX]))){
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//WIN
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echo "WIN: ".$map[$targetY][$targetX]."\n";
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die;
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}else{
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//on va sur la cible
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go($targetX,$targetY);
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}
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}
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}
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function whereToGoAfterCross($xCross,$yCross,$previousX,$previousY){
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//haut
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if(canGoAfterCross($xCross,$yCross -1 ,$xCross,$yCross,$previousX,$previousY)){
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echo "haut\n";
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return array($xCross,$yCross -1);
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}elseif(canGoAfterCross($xCross,$yCross +1 ,$xCross,$yCross,$previousX,$previousY)){
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//bas
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echo "bas\n";
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return array($xCross,$yCross +1);
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}elseif(canGoAfterCross($xCross-1,$yCross,$xCross,$yCross,$previousX,$previousY)){
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//gauche
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echo "gauche\n";
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return array($xCross-1,$yCross);
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}elseif(canGoAfterCross($xCross+1,$yCross,$xCross,$yCross,$previousX,$previousY)){
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//droite
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echo "droite\n";
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return array($xCross+1,$yCross);
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}else{
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//pas de direction possible
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return false;
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}
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}
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function canGoAfterCross($xTo,$yTo,$xNow,$yNow,$xPrevious,$yPrevious){
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global $previousCrosses,$map;
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if(!isset($map[$yTo][$xTo])){return false;}// ça sort des limites de la carte
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if(
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($map[$yTo][$xTo]==" ") // on ne va pas sur un caractere vide
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OR (($xTo==$xPrevious)&&($yTo==$yPrevious)) //on ne peut pas revenir sur nos pas (enfin, ça ne servirait à rien dans cet algo)
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OR (($xTo==$xNow)&&($map[$yTo][$xTo]=="-")) //Déplacement vertical, le caractere suivant ne peut etre "-"
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OR (($yTo==$yNow)&&($map[$yTo][$xTo]=="|")) // Déplacement horizontal, le caractère suivant ne peut être "|"
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OR ((isset($previousCrosses[$xNow."-".$yNow])) && (in_array($xTo."-".$yTo,$previousCrosses[$xNow."-".$yNow]))) //croisement, ne pas prendre une direction déjà prise
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OR (preg_match("/^[a-z]$/",strtolower($map[$yTo][$xTo]))) //peut pas tomber sur une lettre direct apres un croisement
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){
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return false;
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}
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return true;
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}
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function go($targetX,$targetY){
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global $previousX,$previousY,$x,$y,$previousCrosses,$map;
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if(($map[$y][$x]=='S')OR ($map[$y][$x]=='+')){
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//on enregistre le croisement dans lequel on renseigne la direction prise et la direction d'origine
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$previousCrosses[$x."-".$y][]=$previousX."-".$previousY;
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$previousCrosses[$x."-".$y][]=$targetX."-".$targetY;
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}
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$previousX=$x;
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$previousY=$y;
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$x=$targetX;
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$y=$targetY;
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//debug
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echo "deplacement en ".$x.";".$y."\n";
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}
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function goToPreviousCross(){
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global $x,$y,$previousX,$previousY,$xMax,$yMax,$previousCrosses;
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/*
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* On va remonter aux précédents croisements jusqu'à ce
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* qu'un nouveau chemin soit exploitable
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*/
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foreach($previousCrosses as $key => $croisement){
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list($crossX,$crossY)=explode("-",$key);
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$cross=whereToGoAfterCross($crossX,$crossY,-1,-1);
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if($cross){
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go($crossX,$crossY);
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return true;
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}
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}
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//si on arrive là c'est qu'on est bloqués
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echo "Aucun chemin n'est possible\n";
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die;
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}
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