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3sum.cpp
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3sum.cpp
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//Problem : https://leetcode.com/problems/3sum/
class Solution {
public:
vector<vector<int>> threeSum(vector<int>& nums) {
vector<vector<int>> res;
set<vector<int>> temp_res;
sort(nums.begin(), nums.end());
int n = nums.size();
vector<int> v;
int left, right, sum, req_sum;
for(int i=0;i<n-2;i++){
req_sum = -nums[i];
left = i+1;
right = n-1;
while(left<right){
sum = nums[left]+nums[right];
if( sum == req_sum){
v = {nums[i], nums[left], nums[right]};
temp_res.insert(v);
left++;
right--;
}
else if(sum<req_sum){
left++;
}
else{
right--;
}
}
}
for(auto it = temp_res.begin(); it!= temp_res.end(); it++){
res.push_back(*it);
}
return res;
}
};