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  1. //ANIK BARUA 
  2. //9.25.2023-  3:06 PM
  3. #include <bits/stdc++.h>
  4. using namespace std;
  5. #define PI 3.14159265
  6.  
  7. int calc(int a, int b)
  8. {
  9.  
  10.         return (atan2(a, b) * 180) / PI;
  11.  
  12. }
  13. int main()
  14. {
  15.     int t;
  16.     cin >> t;
  17.     while (t--)
  18.     {
  19.         int n;
  20.         cin >> n;
  21.         vector<pair<int, int>> vec;
  22.         for (int i = 0; i < n; i++)
  23.         {
  24.             int a, b;
  25.             cin >> a >> b;
  26.             vec.push_back(make_pair(a, b));
  27.         }
  28.         int count = 0;
  29.         for (int i = 0; i < n - 1; i++)
  30.         {
  31.             int x1 = vec[i].first;
  32.             int y1 = vec[i].second;
  33.  
  34.             for (int j = i + 1; j < n; j++)
  35.             {
  36.                 int x2 = vec[j].first;
  37.                 int y2 = vec[j].second;
  38.                 int angle = calc(x1 - x2, y1 - y2);
  39.                 if (angle % 45 == 0)
  40.                 {
  41.                     count++;
  42.                 }
  43.             }
  44.         }
  45.         cout << count*2 << endl;
  46.     }
  47.  
  48.     return 0;
  49. }
Time limit exceeded #stdin #stdout 5s 5532KB
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stdin
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Standard input is empty
stdout
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28896000
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28896000
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28896000
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28896000
https://ideone.com/rPMEva
language:
C++ (gcc 8.3)
created:
1 year ago
visibility:
secret

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