字符串转换完成

三数之和待优化

threeSum.cpp

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+#include <algorithm>
+#include <iostream>
+#include <set>
+#include <vector>
+using namespace std;
+
+class Solution
+{
+public:
+    vector<vector<int>> threeSum(vector<int> &nums)
+    {
+
+        sort(nums.begin(), nums.end());
+        set<vector<int>> res;
+
+        for(int i = 0; i < nums.size(); i++) {
+            for(int j = i + 1; j < nums.size(); j++) {
+                for(int k = nums.size() - 1; k > j ; k--) {
+                    if(nums[i] + nums[j] + nums[k] == 0) {
+                        vector<int> tmp = {nums[i], nums[j], nums[k]};
+                        res.insert(tmp);
+                    }
+                    
+                }
+            }
+        }
+
+        return vector<vector<int>>(res.begin(), res.end());
+    }
+};
+
+int main()
+{
+    Solution s;
+    vector<int> nums = {-1, 0, 1, 2, -1, -4};
+    vector<vector<int>> res = s.threeSum(nums);
+    for(auto &v : res) {
+        for(auto &i : v) {
+            cout << i << " ";
+        }
+        cout << endl;
+    }
+
+    return 0;
+}