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15.cpp
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34 lines (34 loc) · 1.19 KB
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class Solution {
public:
vector<vector<int>> threeSum(vector<int>& nums) {
vector<vector<int>> triplets;
if(nums.size()<3) return triplets;
vector<int> sortedNums;
copy(nums.begin(),nums.end(),back_inserter(sortedNums));
sort(sortedNums.begin(),sortedNums.end());
int indexA,indexB,indexC,a,sum;
for(int i=0;i<sortedNums.size()-2;i++){
indexA=i;
a=sortedNums[indexA];
if(a>0) return triplets;
if(i>0 && a==sortedNums[indexA-1]) continue;
indexB=i+1;
indexC=sortedNums.size()-1;
while(indexB<indexC){
sum=sortedNums[indexA]+sortedNums[indexB]+sortedNums[indexC];
if(sum==0){
triplets.push_back({a,sortedNums[indexB],sortedNums[indexC]});
while(indexB<indexC && sortedNums[indexB]==sortedNums[indexB+1]) indexB++;
while(indexC>indexB && sortedNums[indexC]==sortedNums[indexC-1]) indexC--;
indexB++;
indexC--;
}else if(sum<0){
indexB++;
}else{
indexC--;
}
}
}
return triplets;
}
};