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  1. /*
  2. Task: Problem 7.08
  3. Date: Dec 24, 2020
  4. Author: aLittleLove (Minh Vu)
  5. */
  6.  
  7. #include<bits/stdc++.h>
  8.  
  9. using namespace std;
  10. const int N = 2e3 + 5;
  11.  
  12. double a[N][N];
  13.  
  14. int main()
  15. {
  16.     ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
  17.     //freopen("input.txt","r",stdin);
  18.     int n; cin >> n >> n;
  19.     for (int i=0; i<n; i++)
  20.         for (int j=0; j<n; j++)
  21.             cin >> a[i][j]; 
  22.     int col = -1; //danh dau cot duy nhat co phan tu bat ki
  23.     for (int i=0; i<n; i++)
  24.         for (int j=0; j<n; j++)
  25.             {
  26.                 if (i==j && a[i][j]!=1) //duong cheo chinh
  27.                 {
  28.                     cout << "No";
  29.                     return 0;
  30.                 }
  31.                 if (i<j && a[i][j]!=0) //phan tu phia tren duong cheo -> i<j
  32.                 {
  33.                     cout << "No";
  34.                     return 0;
  35.                 }
  36.                 if (i>j && a[i][j]!=0) //phan tu phia duoi duong cheo -> i>j
  37.                 {
  38.                     if (col==-1) col = j; //chua danh dau cot nao
  39.                     else if (col!=j) //da co cot duoc danh dau nhung khong phai cot j
  40.                     {
  41.                         cout << "No";
  42.                         return 0;
  43.                     }
  44.                 }
  45.             }
  46.     cout << "Yes";
  47.     return 0;
  48. }
Success #stdin #stdout 0s 4776KB
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stdin
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3 3
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stdout
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https://ideone.com/qUpW7b
UIT 7.08
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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