Add solution 140.

Author: javadev

src/Algorithms/0140.word-break-ii/word-break-ii.php

@@ -0,0 +1,44 @@
+class Solution {
+
+    /**
+     * @param String $s
+     * @param String[] $wordDict
+     * @return String[]
+     */
+    function wordBreak($s, $wordDict) {
+        $map = [];
+        self::wordBreakHelper($s, $wordDict, $map);
+        return $map[$s];
+    }
+    
+    function wordBreakHelper($s, $dict, &$map) {
+        if (array_key_exists($s, $map)) {
+            return $map[$s];   
+        }
+        
+        $list = [];
+        
+        if ($s == "") {
+            array_push($list, "");
+            return $list;
+        }
+
+        foreach ($dict as $currStr) {
+            if (self::startsWith($s, $currStr)) {
+                $tempList = self::wordBreakHelper(substr($s, strlen($currStr)), $dict, $map);
+                if (!empty($tempList)) {
+                    foreach ($tempList as $tempStr) {
+                       array_push($list, $currStr . ($tempStr == "" ? "" : " ") . $tempStr);
+                    }
+                }
+            }
+        }
+        
+        $map[$s] = $list;
+        return $list;
+    }
+    
+    function startsWith($haystack, $needle) {
+        return strncmp($haystack, $needle, strlen($needle)) === 0;
+    }
+}