Help me in solving MISSP problem

help
,
1

My issue

How to start writing code inside codechef, i come from Leetcode. How Can i know what i have to take form user ?? Please give me code of this Question for understanding the writing way in codechef.

My code

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

class Codechef
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
        
	}
}

Learning course: Arrays, Strings & Sorting
Problem Link: Chef and Dolls Practice Problem in - CodeChef

2

@ajaymahiwal
plzz refer the following solution for better understanding

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

class Codechef
{

	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
Scanner scn=new Scanner(System.in);
int t=scn.nextInt();
while(t-->0)
{
    int n=scn.nextInt();
      int doll[]=new int[n];   
    	for( int i=0;i<n;i++)
    	{
      doll[i]=scn.nextInt();
    	}

    	Arrays.sort(doll);
    	int k=check(doll,n);
      System.out.println(k);     
}
}
    	public static int check(int[] doll,int n )
    	{
    	  	
    for (int i=0;i<n-2;i+=2)
    {
        if ((doll[i]!=doll[i+1]))
        {          // i=i+2;
        	return doll[i];
        }
       
       
    }
     return doll[n-1];
    	//return 0;
    	}



}