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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		int n;
  13.         	Scanner scanIn = new Scanner(System.in);        
  14.  
  15. 		n = scanIn.nextInt();
  16.         	int[][] m = new int[n][n];
  17.         	for(int i = 0; i < n; i++) {
  18.     			m[i][i] = 1;
  19.         	}
  20.         	for(int i = 0; i < n; i++) {
  21.     	    		for(int y = 0; y < n; y++) {
  22.     	        		if(m[i][y] != 1) {
  23.     		    			m[i][y] = 0;
  24.     	        		}
  25.             		}
  26.         	}
  27.         	for(int i = 0; i < n; i++) {
  28.     	    		for(int y = 0; y < n; y++) {
  29.                 		System.out.println(m[i][y] + " ");
  30.             		}
  31.          		System.out.println("\n");
  32.         	}
  33. 	}
  34. }
Success #stdin #stdout 0.09s 2841600KB
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https://ideone.com/BySHhb
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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