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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4.  
  5. #define int int64_t
  6.  
  7. void solve() {
  8. 	int N;
  9. 	cin >> N;
  10. 	int a[N][N], b[N][N];
  11. 	for(int i = 0; i < N; i++) {
  12. 		for(int j = 0; j < N; j++) {
  13. 			cin >> a[i][j];
  14. 			b[j][i] = a[i][j];
  15. 		}
  16. 	}
  17. 	bool ok = true;
  18. 	for(int i = 0; i < N; i++) {
  19. 		ok &= *min_element(a[i], a[i] + N) == 0 && 
  20. 		      *min_element(b[i], b[i] + N) == 0;
  21. 	}
  22. 	cout << (ok ? "YES" : "NO") << endl;
  23. }
  24.  
  25. signed main() {
  26. 	//freopen("input.txt", "r", stdin);
  27. 	ios::sync_with_stdio(0);
  28. 	cin.tie(0);
  29. 	int t;
  30. 	cin >> t;
  31. 	while(t--) {
  32. 		solve();
  33. 	}
  34. 	return 0;
  35. }
Success #stdin #stdout 0s 15240KB
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https://ideone.com/QRU6CU
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
secret

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