7.17

Author: zhangzhengxian

README.md

@@ -39,7 +39,9 @@
 |43|[Multiply Strings](https://leetcode.com/problems/multiply-strings/)| [JavaScript](./algorithms/Multiply_Strings.js)|Medium|
 |46|[Permutations](https://leetcode.com/problems/permutations/)| [JavaScript](./algorithms/Permutations.js)|Medium|
 |47|[Permutations II](https://leetcode.com/problems/permutations-ii/)| [JavaScript](./algorithms/PermutationsII.js)|Medium|
-|48|[Rotate Image](https://leetcode.com/problems/permutations-ii/)| [JavaScript](./algorithms/RotateImage.js)|Medium|
+|48|[Rotate Image](https://leetcode.com/problems/rotate-image/)| [JavaScript](./algorithms/RotateImage.js)|Medium|
+|49|[Group Anagrams](https://leetcode.com/problems/group-anagrams/)| [JavaScript](./algorithms/group Anagrams.js)|Medium|
+|50|[Pow(x, n)](https://leetcode.com/problems/powx-n/)| [JavaScript](./algorithms/Pow(x, n).js)|Medium|
 |69|[Sqrt(x)](https://leetcode.com/problems/sqrtx/)| [JavaScript](./algorithms/Sqrt(x).js)|Easy|
 |371|[Sum of Two Integers](https://leetcode.com/problems/sum-of-two-integers/)| [JavaScript](./algorithms/Sum_of_Two_Integers.js)|Easy|
 |372|[Super Pow](https://leetcode.com/problems/super-pow/)| [JavaScript](./algorithms/SuperPow.js)|Medium|

algorithms/Pow(x, n).js

@@ -0,0 +1,21 @@
+/**
+ * @param {number} x
+ * @param {number} n
+ * @return {number}
+ */
+var myPow = function(x, n) {
+    var flag = false,
+        p = x,
+        res = 1
+    if (n < 0) {
+        flag = true;
+    }
+    for (var i = Math.abs(n); i > 0  ; i = Math.floor(i/2)) {
+        if (i % 2 !== 0) {
+            res = res * p;
+        }
+        p = p * p;
+    }
+    result = flag ? 1 / res : res;
+    return result
+};

algorithms/groupAnagrams.js

@@ -0,0 +1,20 @@
+/**
+ * @param {string[]} strs
+ * @return {string[][]}
+ */
+var groupAnagrams = function(strs) {
+    var result = [],
+        obj = {},
+        pipe = function(str) {
+            return str.split('').sort().join('');
+        }
+    for (var i = 0; i < strs.length; i++ ) {
+        if (obj[pipe(strs[i])] === undefined) {
+            obj[pipe(strs[i])] = result.length;
+            result.push([].concat(strs[i]));
+        } else {
+           result[obj[pipe(strs[i])]].push(strs[i]);
+        }
+    }
+    return result;
+};