problem 1

TwoSum.cs

@@ -0,0 +1,26 @@
+using System;
+
+public class Solution {
+    public int[] TwoSum(int[] nums, int target) {
+        int[] sorted = new int[nums.Length];
+        nums.CopyTo(sorted, 0);
+        Array.Sort(sorted);
+        int i = 0, j = sorted.Length - 1;
+        while (sorted[i] + sorted[j] != target) {
+            while (sorted[i] + sorted[j] > target) {
+                j--;
+            }
+            while (sorted[i] + sorted[j] < target) {
+                i++;
+            }
+        }
+        int[] result = new int[2];
+        int r = 0;
+        for (int index = 0; r < 2; index++) {
+            if (nums[index] == sorted[i] || nums[index] == sorted[j]) {
+                result[r++] = index;
+            }
+        }
+        return result;
+    }
+}