Why codechef not accepting my code, giving me java.util.NoSuchElementException

help
1 
import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Codechef
{
	public static void main (String[] args) throws java.lang.Exception
	{
	    Scanner sc= new Scanner(System.in);
		int n = sc.nextInt();
		int a[]= new int[n];
		int c[] = new int[n];
		
		for(int i=0; i<a.length; i++)
		{
		    int b=sc.nextInt();
		    a[i]=b;// your code goes here
		}
		
		for(int i=0; i<a.length; i++){
		    int b=0;
		    for(int j=a[i]; j>0; j/=10){
		        b=b*10+(j%10);
		    }
		    System.out.println(b);
		
	
	    }
	}
	
	
	
}
1 Like
2

if thats the program for reversing a number then that works fine on giving some input.

3

Please share the question link.

4

I just did that on my local IDE.

5

try to run in your local compiler or online compiler

6

Hey…What I understand from your above code is “You are trying to reverse each and every element of the given array”. It’s working fine for me atleast.

Try to run again.

7

Encapsulate the entire code which is inside main inside a try catch block

8

Try giving custom input and then run

9

Use the hasNext() function of Scanner class before taking inputs to check is if there is any input on the input stream.

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Codechef
{
	public static void main (String[] args) throws java.lang.Exception
	{
	    Scanner sc= new Scanner(System.in);
	    int n=0,b=0;
	    if(sc.hasNext())
		    n = sc.nextInt();
		int a[]= new int[n];
		int c[] = new int[n];
		
		for(int i=0; i<a.length; i++)
		{
		    if(sc.hasNext())
		        b=sc.nextInt();
		    a[i]=b;// your code goes here
		}
		
		for(int i=0; i<a.length; i++){
		    b=0;
		    for(int j=a[i]; j>0; j/=10){
		        b=b*10+(j%10);
		    }
		    System.out.println(b);
		
	
	    }
	}
}
1 Like