three_sum
three_sum.cpp 源码
//
// Created by roseduan on 2021/9/18.
//
#include "iostream"
#include "vector"
using namespace std;
class Solution{
public:
vector<vector<int>> threeSum(vector<int>& nums) {
if (nums.size() < 3) {
return {};
}
std::sort(nums.begin(), nums.end());
vector<vector<int>> res;
for (int i = 0; i < nums.size() - 2; i++) {
if (nums[i] > 0) {
break;
}
if (i > 0 && nums[i] == nums[i - 1]) {
continue;
}
int j = i + 1, k = (int) nums.size() - 1;
while (j < k) {
if (nums[j] + nums[k] > -nums[i]) {
k--;
} else if (nums[j] + nums[k] < -nums[i]) {
j++;
} else {
res.push_back({nums[i], nums[j], nums[k]});
j++;
k--;
while (j < k && nums[j] == nums[j - 1]) {
j++;
}
while (j < k && nums[k] == nums[k + 1]) {
k--;
}
}
}
}
return res;
}
};
// -5 -3 5 6 8
int main() {
vector<int> data {-1, 0, 1};
Solution sol;
const vector<vector<int>> &res = sol.threeSum(data);
cout << res.size() << endl;
}
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