Create 0140-word-break-ii.js

javascript/0140-word-break-ii.js

@@ -0,0 +1,38 @@
+/**
+ * Backtracking | Recursion
+ * Time O(n^k) | Space O(n) | n = number of words in dict, k is length of the string.
+ * https://leetcode.com/problems/word-break-ii
+ * @param {string} s
+ * @param {string[]} wordDict
+ * @return {string[]}
+ */
+var wordBreak = function(s, wordDict) {
+
+    wordDict = new Set(wordDict);
+
+    const allSentences = [];
+
+    const dfs = (startIdx, sentence) => {
+        if (startIdx >= s.length) {
+            if (sentence.length) {
+                allSentences.push(sentence.slice());
+            }
+            return;
+        }
+
+        for (let i = startIdx; i < s.length; i++) {
+            const currWord = s.slice(startIdx, i+1);
+            if (wordDict.has(currWord)) {
+                sentence.push(currWord);
+                dfs(i+1, sentence);
+                sentence.pop();
+            }
+        }
+    }
+
+    dfs(0, []);
+    for (let i = 0; i < allSentences.length; i++) {
+        allSentences[i] = allSentences[i].join(" ");
+    }
+    return allSentences;
+};