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//#include<iostream>
//#include<vector>
//using namespace std;
//int main(){
//    int n;
//    cin>>n;
//    vector<int>nums(n,0);
//    for(int i=0; i<n; i++){
//        cin>>nums[i];
//    }
//    sort(nums.begin(), nums.end());
//    int cnt=0;
//    for(int i=0; i<n; i++){
//        for(int j=i+1; j<n; j++){
//            int target = nums[i]+nums[j];
//            int l=0, r=n-1;
//            while(l<r){
//                if(l==i || l==j){
//                    l++; continue;
//                }
//                if(r==i || r==j){
//                    r--; continue;
//                }
//                int sum = nums[l]+nums[r];
//                if(target<sum){
//                    r--;
//                }else if(target>sum){
//                    l++;
//                }else{
//                    cout<<i<<' '<<j<<' '<<l<<' '<<r<<' '<<target<<' '<<sum<<endl;
//                    cnt++;
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