leetcode 15. 三数之和

题目描述

代码：

class Solution {
public:vector<vector<int>> threeSum(vector<int>& nums) {sort(nums.begin(),nums.end());int len = nums.size();int left = 0;int right = 0;vector<vector<int>> res;for(int i = 0;i <len;i++){if(nums[i]>0)break;if(i>0 && nums[i-1] == nums[i])continue;left = i+1;right = len-1;while(left <right){if(nums[i]+nums[left]+nums[right] == 0){while(nums[left] == nums[left+1]&&left+1<right)left++;while(nums[right] == nums[right-1]&&left<right-1)right--;res.push_back({nums[i],nums[left],nums[right]});left++;right--;}else if(nums[i]+nums[left]+nums[right] > 0)right--;elseleft++;}}return res;}
};