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3sum.cc
48 lines (45 loc) · 1.26 KB
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3sum.cc
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#include<vector>
#include<set>
#include<iostream>
using namespace std;
class Solution {
public:
vector<vector<int> > threeSum(vector<int> &num) {
vector<vector<int>> res;
sort(num.begin(), num.end());
int len = num.size();
int i = 0;
while(i < len) {
int target = -1 * num[i];
int start = i + 1, end = len - 1;
while(start < end) {
if (num[start] + num[end] == target) {
vector<int> tmp = {num[i], num[start], num[end]};
res.push_back(tmp);
int s = num[start], e = num[end];
while(start < end && num[start] == s) start++;
while(start < end && num[end] == e) end--;
} else if (num[start] + num[end] < target) {
start++;
} else {
end--;
}
}
while(i < len && num[i] == -1 * target) {
i++;
}
}
return res;
}
};
int main() {
Solution *s = new Solution();
vector<int> input = {-1, 0, 1, 2, -1, -4};
auto t = s->threeSum(input);
for(auto res : t) {
for(auto v : res) {
cout << v << " ";
}
cout << endl;
}
}