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- #include<bits/stdc++.h>
- using namespace std;
- #define op ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0)
- #define endl "\n"
- int main()
- {
- op;
- int t;
- cin>>t;
- while(t--){
- int n;
- cin>>n;
- // int a=0;
- vector<int>v(n);
- vector<pair<int,int> >p;
- for (auto &u :v ) cin>>u;
- int k;
- cin>>k;
- for(int i=0;i<n;i++){
- for(int j=0;j<n;j++){
- if(i!=j && v[i]-v[j]==k) p.push_back(make_pair(v[i],v[j]));
- }
- }
- sort(p.begin(),p.end());
- int a = unique(p.begin(),p.end())-p.begin();
- cout<<a<<endl;
- }
- }
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