新增 0977 有序数组的平方 JavaScript版本 更加简洁高效的解法

problems/0977.有序数组的平方.md

@@ -199,27 +199,26 @@ impl Solution {
 Javascript：
 ```Javascript
 /**
- * @desc two pointers solution
- * @link https://leetcode-cn.com/problems/squares-of-a-sorted-array/
- * @param nums Array  e.g. [-4,-1,0,3,10]
- * @return {array}    e.g. [0,1,9,16,100]
+ * @param {number[]} nums
+ * @return {number[]}
  */
-const sortedSquares = function (nums) {
-    let res = []
-    for (let i = 0, j = nums.length - 1; i <= j;) {
-      const left = Math.abs(nums[i])
-      const right = Math.abs(nums[j])
-      if (right > left) {
-        // push element to the front of the array
-        res.unshift(right * right)
-        j--
-      } else {
-        res.unshift(left * left)
-        i++
-      }
+var sortedSquares = function(nums) {
+    let n = nums.length;
+    let res = new Array(n).fill(0);
+    let i = 0, j = n - 1, k = n - 1;
+    while (i <= j) {
+        let left = nums[i] * nums[i],
+            right = nums[j] * nums[j];
+        if (left < right) {
+            res[k--] = right;
+            j--;
+        } else {
+            res[k--] = left;
+            i++;
+        }
     }
-    return res
-  }
+    return res;
+};
 ```
 
 Swift: