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  1. #include <bits/stdc++.h>
  2. #define FOR(i, a, b) for(int i = (a), _b = (b); i <= _b; ++i)
  3. #define fi first
  4. #define se second
  5. #define el "\n"
  6. #define pb push_back
  7. #define sz(a) (int)a.size()
  8. #define FILL(a, x) memset(a, x, sizeof(a))
  9.  
  10. using namespace std;
  11. typedef long long ll;
  12. typedef pair<string, string> ii;
  13. const int N = (int)1e6+3;
  14. ii a[60];
  15. int n;
  16. ll ans;
  17.  
  18. int main()
  19. {
  20.     ios_base::sync_with_stdio(false);
  21.     cin.tie(NULL);    cout.tie(NULL);
  22.     freopen("bff.inp", "r", stdin);
  23.     freopen("bff.out", "w", stdout);
  24.     cin >> n;
  25.     FOR(i, 1, n) cin >> a[i].fi >> a[i].se;
  26.     FOR(i, 1, n)
  27.      FOR(j, 1, n)
  28.       if (i != j && a[i].fi == a[j].se) ++ans;
  29.     cout << ans;
  30.     return 0;
  31. }
  32.  
Success #stdin #stdout 0.01s 5336KB
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https://ideone.com/qcS4bE
language:
C++14 (clang 8.0)
created:
1 day ago
visibility:
public

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