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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int n;
  6. 	cin >> n;
  7.     int m[n][n];
  8.     for(int i=0;i<n;i++)
  9.     {
  10.     	m[i][i]=1;
  11.     }
  12.     for(int i=0;i<n;i++)
  13.     {
  14.     	for(int y=0;y<n;y++)
  15.         {
  16.     	    if(m[i][y]!=1)
  17.     	    {
  18.     		    m[i][y]=0;
  19.     	    }
  20.         }
  21.     }
  22.     for(int i=0;i<n;i++)
  23.     {
  24.     	for(int y=0;y<n;y++)
  25.         {
  26.         	cout<<m[i][y]<<" ";
  27.         }
  28.         cout<<"\n";
  29.     }
  30.     return 0;
  31. }
Success #stdin #stdout 0s 3416KB
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1 0 0 
0 1 0 
0 0 1
https://ideone.com/KRFsJY
A694A
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
secret

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