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39 3-sum.cpp
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39 3-sum.cpp
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class Solution {
public:
vector<vector<int>> threeSum(vector<int>& nums) {
vector<vector<int>> res;
if (nums.size() < 2)
return res;
sort(nums.begin(), nums.end());
for (int i = 0; i < nums.size() - 2; i++) {
if (i == 0 || (i > 0 && nums[i] != nums[i - 1])) {
int lo = i + 1;
int high = nums.size() - 1;
int sum = 0 - nums[i];
while (lo < high) {
if (sum == nums[lo] + nums[high]) {
vector<int> temp;
temp.push_back(nums[i]);
temp.push_back(nums[lo]);
temp.push_back(nums[high]);
res.push_back(temp);
while (lo < high && nums[lo + 1] == nums[lo]) lo++;
while (lo < high && nums[high - 1] == nums[high]) high--;
lo++;
high--;
}
else if (nums[lo] + nums[high] < sum) lo++;
else high--;
}
}
}
return res;
}
};