diff --git a/test001.cpp b/test001.cpp
new file mode 100644
index 0000000..a05288a
--- /dev/null
+++ b/test001.cpp
@@ -0,0 +1,28 @@
+class Solution {
+public:
+    vector<int> twoSum(vector<int>& nums, int target) {
+        int n = nums.size();
+        vector<int> idxs;
+        for(int i = 0; i < n; i++) idxs.push_back(i);
+
+        // Can¡®t be sorted directly
+        sort(idxs.begin(), idxs.end(), [&nums](int i, int j){
+            return nums[i] < nums[j];
+        });
+        int l = 0, r = n - 1;
+        vector<int> res;
+        while(l < r){
+            int sum = nums[idxs[l]] + nums[idxs[r]];
+            if(sum == target){
+                res.push_back(idxs[l]);
+                res.push_back(idxs[r]);
+                break;
+            }else if(sum > target){
+                r--;
+            }else{
+                l++;
+            }
+        }
+        return res;
+    }
+};
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