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18.4 sum.cpp
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18.4 sum.cpp
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class Solution {
public:
vector<vector<int>> fourSum(vector<int>& nums, int target) {
sort(nums.begin(),nums.end());
vector<vector<int>> result;
map<vector<int>, int> TestDuplicate;
int target1;
int target2;
for(int i = 0; i< nums.size(); i++){
target1 = target-nums[i];
for(int j = i+1; j<nums.size(); j++){
target2 = target1 - nums[j];
int start = j+1;
int end = nums.size()-1;
while(start<end){
if(target2 == nums[start]+nums[end]){
vector<int> PreResult;
PreResult.push_back(nums[i]);
PreResult.push_back(nums[j]);
PreResult.push_back(nums[start]);
PreResult.push_back(nums[end]);
if(TestDuplicate[PreResult] ==0){
result.push_back(PreResult);
TestDuplicate[PreResult] = 1;
}
start++;
end--;
}else if(target2<nums[start]+nums[end]){
end--;
}else
start++;
}
}
}
return result;
}
};