Data commit

Task/Combinations/PHP/combinations-1.php

@@ -0,0 +1,49 @@
+ <?php
+
+$a=array(1,2,3,4,5);
+$k=3;
+$n=5;
+$c=array_splice($a, $k);
+$b=array_splice($a, 0, $k);
+$j=$k-1;
+print_r($b);
+
+        while (1) {
+	
+       		$m=array_search($b[$j]+1,$c);
+       	     if ($m!==false) {
+	     	$c[$m]-=1;
+        	$b[$j]=$b[$j]+1;
+               	print_r($b);	
+        }
+       	if ($b[$k-1]==$n) {
+	 $i=$k-1;
+	 while ($i >= 0) {
+
+	 		if ($i == 0 && $b[$i] == $n-$k+1) break 2;
+	
+       		  $m=array_search($b[$i]+1,$c);
+		  if ($m!==false) {
+		  	  $c[$m]=$c[$m]-1;
+			  $b[$i]=$b[$i]+1;
+
+			$g=$i;
+		while ($g != $k-1) {
+			array_unshift ($c, $b[$g+1]);
+			$b[$g+1]=$b[$g]+1;
+			$g++;
+			}
+			$c=array_diff($c,$b);
+			print_r($b);
+		 	     break;
+       			 }
+	 	$i--;
+	
+		}
+	
+	}
+	
+
+}
+
+?>

Task/Combinations/PHP/combinations-2.php

@@ -0,0 +1,48 @@
+<?php
+
+function combinations_set($set = [], $size = 0) {
+    if ($size == 0) {
+        return [[]];
+    }
+
+    if ($set == []) {
+        return [];
+    }
+
+
+    $prefix = [array_shift($set)];
+
+    $result = [];
+
+    foreach (combinations_set($set, $size-1) as $suffix) {
+        $result[] = array_merge($prefix, $suffix);
+    }
+
+    foreach (combinations_set($set, $size) as $next) {
+        $result[] = $next;
+    }
+
+    return $result;
+}
+
+function combination_integer($n, $m) {
+    return combinations_set(range(0, $n-1), $m);
+}
+
+assert(combination_integer(5, 3) == [
+    [0, 1, 2],
+    [0, 1, 3],
+    [0, 1, 4],
+    [0, 2, 3],
+    [0, 2, 4],
+    [0, 3, 4],
+    [1, 2, 3],
+    [1, 2, 4],
+    [1, 3, 4],
+    [2, 3, 4]
+]);
+
+echo "3 comb 5:\n";
+foreach (combination_integer(5, 3) as $combination) {
+    echo implode(", ", $combination), "\n";
+}