LeetCode 15. 3Sum
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Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique triplets in the array which gives the sum of zero.
Note: The solution set must not contain duplicate triplets.
For example, given array S = [-1, 0, 1, 2, -1, -4],A solution set is:[ [-1, 0, 1], [-1, -1, 2]]answer:
class Solution {public: vector<vector<int>> threeSum(vector<int>& nums) { sort(nums.begin(),nums.end()); int sum = 0; vector<vector<int>> result; for(int i = 0; i < nums.size(); i ++){ int start = i + 1; int end = nums.size() - 1; vector<int> tuple; while( start < end){ sum = nums[i] + nums[start]; if(nums[end] > 0 - sum ) end --; else if(nums[end] < 0 - sum ) start ++; else { tuple.push_back(nums[i]); tuple.push_back(nums[start]); tuple.push_back(nums[end]); end --; start ++; while(start < end && nums[end] == nums[end + 1]) end --; while(start < end && nums[start] == nums[start - 1]) start ++; result.push_back(tuple); tuple.clear(); vector<int>(tuple).swap(tuple); } } while(i < nums.size() && nums[i + 1] == nums[i]) i++; } return result; }};
another solution:
public List<List<Integer>> threeSum(int[] num) { Arrays.sort(num); List<List<Integer>> res = new LinkedList<>(); for (int i = 0; i < num.length-2; i++) { if (i == 0 || (i > 0 && num[i] != num[i-1])) { int lo = i+1, hi = num.length-1, sum = 0 - num[i]; while (lo < hi) { if (num[lo] + num[hi] == sum) { res.add(Arrays.asList(num[i], num[lo], num[hi])); while (lo < hi && num[lo] == num[lo+1]) lo++; while (lo < hi && num[hi] == num[hi-1]) hi--; lo++; hi--; } else if (num[lo] + num[hi] < sum) lo++; else hi--; } } } return res;}
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