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  1. class A {
  2.   public static void main(String[] args) {
  3.     int n = 10000;
  4.  
  5.     int g[][] = new int[n][n];
  6.     long st, en;
  7.  
  8.     // one
  9.     st = System.nanoTime();
  10.     for(int i = 0; i < n; i++) {
  11.       for(int j = 0; j < n; j++) {
  12.         g[i][j] = i + j; 
  13.       }
  14.     }
  15.     en = System.nanoTime();
  16.     System.out.println("\nTwo time " + (en - st)/1000000.d + " msc");
  17.  
  18.     // two
  19.     st = System.nanoTime();
  20.     for(int i = 0; i < n; i++) {
  21.       g[i][i] =  i + i;
  22.       for(int j = 0; j < i; j++) {
  23.         g[j][i] = g[i][j] = i + j; 
  24.       }
  25.     }
  26.     en = System.nanoTime();
  27.     System.out.println("\nTwo time " + (en - st)/1000000.d + " msc");
  28.  
  29.     st = System.nanoTime();
  30.         for (int i = 0; i < n; i++) {
  31.             g[i][i] = i << 1;
  32.             for (int j = i + 1; j < n; j++) {
  33.                 g[i][j] = i + j;
  34.             }
  35.         }
  36.         for (int i = 1; i < n; i++) {
  37.             System.arraycopy(g[i-1], 1, g[i], 0, i);
  38.         }
  39.         en = System.nanoTime();
  40.         System.out.println("\nThree time " + (en - st) / 1000000.d + " msc");
  41.   }
  42. }
Runtime error #stdin #stdout #stderr 0.64s 380160KB
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Standard input is empty
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Standard output is empty
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Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
	at A.main(Main.java:5)
https://ideone.com/nSNXOb
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language:
Java (HotSpot 12)
created:
10 years ago
visibility:
public

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