Help me in solving UWCOI20A problem

help
,
1

My issue

“Time Limit Exceeded”

why this comes when I run or submit

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
		Scanner sc = new Scanner(System.in);
		int t = sc.nextInt();

		while(t-->0){
		    int n = sc.nextInt();
		    int[] mountain = new int[n];
		    int highest = 0;
		    for(int i = 0;i < n;i++){
		        mountain[i] = sc.nextInt();
		        if(highest < mountain[i])
		            highest = mountain[i];
		    }
		    System.out.println(highest);
		}

	}
}

Learning course: Data Structures & Algorithms using C
Problem Link: Find maximum in an Array in Data Structures & Algorithms using C