1、C++
vector<vector<int>> threeSum(vector<int>& nums) {
vector<vector<int>>res;
sort(nums.begin(), nums.end());
int n = nums.size();
for (int i = 0; i < n - 2; i++)
{
int L = i + 1;
int R = n - 1;
if (nums[i] > 0) continue;
while (L < R) {
if (nums[i] + nums[L] + nums[R] == 0) {
vector<int> resList = { nums[i],nums[L],nums[R] };
res.push_back(resList);
}
if (nums[i] + nums[L] + nums[R] <= 0) {
while (L <= n - 2 && nums[L] == nums[L + 1])
L++;
L++;
}
else {
while (R >= 1 && nums[R] == nums[R - 1])
R--;
R--;
}
}
while (i < n - 1 && nums[i] == nums[i + 1])
i++;
}
return res;
}