inprove readability

Author: v-lili

Algorithms Basics/Chapter 1. Array_String/167. Two Sum II - Input array is sorted.cs

@@ -5,22 +5,22 @@ 653. Two Sum IV - Input is a BST
  */
 public class Solution {
     public int[] TwoSum(int[] nums, int target) {
-        int[] res = null;
-        if (nums == null || nums.Length == 0) {
-            return res;
+        int[] result = null;
+        if (nums == null || nums.Length < 2) {
+            return result;
         }
         for (int i = 0, j = nums.Length - 1; i < j;) {
-            var v = nums[i] + nums[j];
-            if (v == target) {
-                res = new int[] { i + 1, j + 1 };
+            var sum = nums[i] + nums[j];
+            if (sum == target) {
+                result = new int[] { i + 1, j + 1 };
                 break;
             }
-            if (v < target) {
+            if (sum < target) {
                 i++;
             } else {
                 j--;
             }
         }
-        return res;
+        return result;
     }
 }