Hey guys,

I am practicing the IARCS Problem Archive.

When I am trying to submit a solution in Java, I get the following error:

Runtime Error: EXIT

Description: Program did not return 0

Please help as I am new to this.

This is the code I have written for the "Tiles" program.

import java.util.*;
 
class Main {
 
  private boolean check(String s) {
 
    String s1=s;
    //If it has double 0 in it, replace it with some random special character. So only lonely zeroes will be present
    s1=s1.replace("00","$");
    char[] ch=s1.toCharArray();
    for(int i=0;i<ch.length;i++)
    {
      if(ch[i]=='0')//If there are any lonely zeroes, then return false.
        return false;
    }
    return true;
  }
  
  public static void main(String[] args) {
    Main ob=new Main();
    int count=0;
    Scanner sc=new Scanner(System.in);
    //Taking Input
    int n=sc.nextInt();
    int[] t=new int[n];
    String[] s=new String[(int) Math.pow(2,n)];
    for(int i=0;i<Math.pow(2,n);i++)
    {
      int temp=i;
 
      //Converting the integers from 0 to 2^(n-1) into binary
      for(int j=0;j<n;j++)
      {
        t[j]=temp%2;
        temp=temp/2;
      }
         
        //Concatenating the digits of the binary number into a String. Like 15 as "1111"
        for(int k=0;k<t.length;k++)
        {
          s[i]+=Integer.toString(t[k]);
        }
        //passing the String to a function that checks the given conditions
        boolean boo = ob.check(s[i]);
        if(boo==true)
          count++;
    }
    System.out.println(count);
  }
 
}