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0015.cpp
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0015.cpp
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class Solution {
public:
vector<vector<int>> threeSum(vector<int>& nums) {
vector<vector<int>> result;
if(nums.size() < 3)
return result;
sort(nums.begin(), nums.end());
for(int i=0; i<nums.size()-2; i++){
if(i == 0 || nums[i] != nums[i-1]){
int target = -nums[i];
int low = i + 1;
int high = nums.size() - 1;
while(low < high){
if(nums[low] + nums[high] == target){
vector<int> triplet;
triplet.push_back(nums[i]);
triplet.push_back(nums[low]);
triplet.push_back(nums[high]);
result.push_back(triplet);
while((low < high) && nums[low] == nums[low + 1])
low++;
while((low < high) && nums[high] == nums[high - 1])
high--;
low++;
high--;
}
else if(nums[low] + nums[high] < target)
low++;
else
high--;
}
}
}
return result;
}
};