Reverse An Array

 1. You are given a number n, representing the size of array a.

2. You are given n numbers, representing elements of array a.
3. You are required to reverse the contents of array a.

Input Format

Input is managed for you

Output Format

Output is managed for you

Constraints
0 <= n < 10^4
-10^9 <= a[i] <= 10^9
Sample Input
5
1
2
3
4
5
Sample Output
5 4 3 2 1

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

public class Main{
  public static void display(int[] a){
    StringBuilder sb = new StringBuilder();

    for(int val: a){
      sb.append(val + " ");
    }
    System.out.println(sb);
  }

  public static void reverse(int[] a){
    // write your code here
    int lt =0,rt = a.length-1,temp;
    while(lt<rt){
        temp = a[lt];
        a[lt]=a[rt];
        a[rt]=temp;
        ++lt;
        --rt;
    }
  }

public static void main(String[] args) throws Exception {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

    int n = Integer.parseInt(br.readLine());
    int[] a = new int[n];
    for(int i = 0; i < n; i++){
       a[i] = Integer.parseInt(br.readLine());
    }

    reverse(a);
    display(a);
 }

}