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  1. #include"bits/stdc++.h"
  2. #define int long long
  3. using namespace std;
  4.  
  5. void TEST_CASE() {
  6.     int n;
  7.     cin >> n;
  8.     vector<string>s(n);
  9.     for (int i = 0; i < n; i++) {
  10.         cin >> s[i];
  11.     }
  12.     vector<bitset<2005>>bit(n), bit2(n);
  13.     for (int i = 0; i < n; i++) {
  14.         for (int j = 0; j < n; j++) {
  15.             if (s[i][j] == '1') {
  16.                 bit[i][j] = 1;
  17.                 bit2[i][j] = 1;
  18.             }
  19.         }
  20.     }
  21.     int ans = 0;
  22.     for (int i = 0; i < n; i++) {
  23.         for (int j = i + 1; j < n; j++) {
  24.             bit[i] &= bit[j];
  25.             int cnt = bit[i].count();
  26.             ans += (cnt * (cnt - 1)) / 2;
  27.             bit[i] |= bit2[i];
  28.         }
  29.     }
  30.     cout << ans << endl;
  31. }
  32.  
  33. signed main() {
  34.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  35.     int t = 1;
  36.     //cin >> t;
  37.     while (t--) {
  38.         TEST_CASE();
  39.     }
  40.     return 0;
  41. }
  42.  
Success #stdin #stdout 0.03s 5456KB
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https://ideone.com/acQblg
language:
C++14 (gcc 8.3)
created:
1 year ago
visibility:
public

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