Updating exercises

src/exercises/49.group-anagrams.js

@@ -0,0 +1,18 @@
+// @leet start
+/**
+ * @param {string[]} strs
+ * @return {string[][]}
+ */
+var groupAnagrams = function(strs) {
+    if (strs.length < 2) return [strs];
+    const map = {};
+    for (const str of strs) {
+        const key = str.split("").sort().join("");
+        if (!map[key]) {
+            map[key] = [];
+        }
+        map[key].push(str);
+    }
+    return Object.values(map);
+};
+// @leet end