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  1. class Ruler
  2. {
  3.     /*public static boolean f(int[] a){
  4.         int l=a.length,i=0,b=0,e=l-1;
  5.         int[] x=new int[l];
  6.         for(;i<l;i++)x[i]=i;
  7.         for(i--;i>0;i--)
  8.             if(a[i]==x[b]) b++;
  9.             else if(a[i]==x[e]) e--;
  10.             else return false;
  11.         return true;
  12.     }*/
  13.     public static
  14.     boolean f(int[]a){int l=a.length,i=0,b=0,e=l-1;int[]x=new int[l];for(;i<l;i++)x[i]=i;for(i--;i>0;i--)if(a[i]==x[b])b++;else if(a[i]==x[e])e--;else return 0>1;return 1>0;}
  15.  
  16. 	public static void main(String[] args) throws java.lang.Exception
  17. 	{
  18. 	    int[] antsy={4, 3, 5, 2, 1, 0};
  19. 	    System.out.println(f(antsy));
  20. 	    int[] notAntsy={3, 2, 5, 4, 1, 0};
  21. 	    System.out.println(f(notAntsy));
  22. 	    int[] antsy2={6, 5, 4, 7, 3, 8, 9, 2, 1, 0};
  23. 	    System.out.println(f(antsy2));
  24. 	    int[] notAntsy2={4, 3, 5, 6, 7, 2, 9, 1, 0, 8};
  25. 	    System.out.println(f(notAntsy2));
  26. 	}
  27. }
Success #stdin #stdout 0.04s 711168KB
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https://ideone.com/bV6LcM
Antsy
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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