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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. long long Solve() {
  5.   int n;
  6.   scanf("%d", &n);
  7.   vector<int> x(n), y(n);
  8.   for (int i = 0; i < n; ++i)
  9.     scanf("%d %d", &x[i], &y[i]);
  10.  
  11.   long long ans = 0;
  12.   for (int i = 0; i < n; ++i) {
  13.     unordered_map<int,int> dist_cnt;
  14.     for (int j = 0; j < n; ++j) {
  15.       int dx = x[i] - x[j], dy = y[i] - y[j];
  16.       ++dist_cnt[dx*dx + dy*dy];
  17.     }
  18.     for (const auto& p : dist_cnt) {
  19.       ans += p.second * (p.second-1) / 2;
  20.     }
  21.   } 
  22.   return ans;
  23. }
  24.  
  25. int main() {
  26.   int ntests;
  27.   scanf("%d", &ntests);
  28.   for (int nt = 1; nt <= ntests; ++nt) {
  29.     printf("Case #%d: %lld\n", nt, Solve());
  30.   }
  31.   return 0;
  32. }
  33.  
Success #stdin #stdout 0s 3464KB
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https://ideone.com/YVXMBV
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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