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3Sum.cpp
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33 lines (33 loc) · 954 Bytes
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class Solution {
public:
vector<vector<int> > threeSum(vector<int> &num) {
set<vector<int> > res;
//vector<int> localSum(num);
sort(num.begin(), num.end());
for(int i=0;i+2<num.size();i++) {
if(i>=1 && num[i] == num[i-1]) {
continue;
}
int j=i+1;
int k=num.size()-1;
while(j<k) {
int s = num[i]+num[j]+num[k];
if(s==0) {
vector<int> tmp;
tmp.push_back(num[i]);
tmp.push_back(num[j]);
tmp.push_back(num[k]);
res.insert(tmp);
j++;
k--;
}
else if(s<0) {
j++;
} else {
k--;
}
}
}
return vector<vector<int> >(res.begin(), res.end());
}
};