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  1. #include<bits/stdc++.h>
  2. #define ll long long
  3. using namespace std;
  4. ll ary[10000][2];
  5. int caso;
  6. vector<map<ll,ll>> maap;
  7. ll dist(int i,int j){
  8.     ll x1,x2,y1,y2;
  9.     x1=ary[i][0],x2=ary[j][0];
  10.     y1=ary[i][1],y2=ary[j][1];
  11.     return (x1-x2)*(x1-x2) + (y1-y2)*(y1-y2);
  12. }
  13. int main(){
  14.     ios_base::sync_with_stdio(false);
  15.     cin.tie(0);
  16.     cout.tie(0);
  17.     cin>>caso;
  18.     for(int t=1;t<=caso;t++){
  19.         ll n;
  20.         cin>>n;
  21.         for(int i=0;i<n;i++)
  22.             cin>>ary[i][0]>>ary[i][1];
  23.  
  24.         maap.clear();
  25.         maap.resize(2001);
  26.         ll resp=0;
  27.         for(int i=0;i<n;i++){
  28.             for(int j=i+1;j<n;j++){
  29.                 ll d=dist(i,j);
  30.                 maap[i][d]++;
  31.                 maap[j][d]++;
  32.             }
  33.         }
  34.         for(int i=0;i<n;i++){
  35.             for(auto itr : maap[i]){
  36.                 ll d=itr.second;
  37.                 resp+=d*(d-1)/2;
  38.             }
  39.         }
  40.         cout<<"Case #"<<t<<": "<<resp<<'\n';
  41.     }
  42. return 0;
  43. }
  44.  
Success #stdin #stdout 0s 3616KB
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https://ideone.com/SuTf2u
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
secret

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