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  1. //Source: JadArab
  2.  
  3. #include <bits/stdc++.h>
  4. using namespace std;
  5.  
  6. int main() {
  7.     int n, m;
  8.     cin >> n >> m;
  9.     vector<int> deg(n+1, 0);
  10.  
  11.     for (int i = 0; i < m; ++i) {
  12.         int x, y;
  13.         cin >> x >> y;
  14.         deg[x]++, deg[y]++;
  15.     }
  16.  
  17.     int d1 = 0, d2 = 0, dn = 0;
  18.     for (int i = 1; i <= n; ++i) {
  19.         if (deg[i] == 1) d1++;
  20.         else if (deg[i] == 2) d2++;
  21.         else if (deg[i] == n-1) dn++;
  22.     }
  23.  
  24.     if (m == n - 1 && d1 == 2 && d2 == n - 2) cout << "bus topology";
  25.     else if (m == n && d2 == n) cout << "ring topology";
  26.     else if (m == n - 1 && dn == 1 && d1 == n - 1) cout << "star topology";
  27.     else cout << "unknown topology";
  28.  
  29.     return 0;
  30. }
Runtime error #stdin #stdout #stderr 0.01s 5284KB
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stdin
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Standard input is empty
stdout
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Standard output is empty
stderr
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terminate called after throwing an instance of 'std::bad_alloc'
  what():  std::bad_alloc
https://ideone.com/om9eh7
language:
C++14 (gcc 8.3)
created:
10 days ago
visibility:
secret

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