# Wrong answer? Could you tell me the reason,thanks a lot!

• The solution below.when i test [1,2] with target=5,the result is null and it`s correct,but when i submit the result is wrong! Can someone tell me why?

``````class Solution {
public:
vector<vector<int>>rlt;
vector<int>can;
int t;
vector<vector<int>> combinationSum2(vector<int>& candidates, int target) {
vector<int> nums;
can=candidates;
t=can.size()-1;
sort(can.begin(),can.end());
run(0,nums,target);
return rlt;
}
void run(int i,vector<int>nums,int target){
if(target<0) return;
else if(target==0) {
rlt.push_back(nums);
return;
}
if(i>t) return;
if(target<can[i]) return;
int j=i;
for(;can[j]==can[i];j++){}
//from i to j the candidate is same,we just push back all kind of different sum
for(;i<j;i++){
nums.insert(nums.end(),j-i,can[i]);
//nums.push_back(can[i]);
run(j,nums,target-(j-i)*can[i]);
//nums.pop_back();
nums.erase(nums.end()-(j-i),nums.end());
}

run(j,nums,target);
return;
}
};

``````

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