two sum solution

Author: ys-han00

two-sum/ys-han00.cpp

@@ -0,0 +1,20 @@
+#include <bits/stdc++.h>
+
+class Solution {
+public:
+    vector<int> twoSum(vector<int>& nums, int target) {
+        vector<pair<int, int>> num_idx;
+        for(int i = 0; i < nums.size(); i++)
+            num_idx.push_back({nums[i], i});
+        
+        sort(num_idx.begin(), num_idx.end());
+
+        int left = 0, right = nums.size() - 1;
+        while(1) {
+            if (num_idx[left].first + num_idx[right].first == target)
+                return vector<int>({num_idx[left].second, num_idx[right].second});
+            if(num_idx[left].first + num_idx[right].first < target) left++;
+            else right--;
+        }
+    }
+};