[Hackerrank] Arrays

[Hackerrank] Arrays

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Objective

Today, we will learn about the Array data structure. Check out the Tutorial tab for learning materials and an instructional video.

Task

Given an array, A, of N integers, print A's elements in reverse order as a single line of space-separated numbers.

Example

A = [1, 2, 3, 4]

Print 4 3 2 1. Each integer is separated by one space.

Input Format

The first line contains an integer, N (the size of our array).

The second line contains N space-separated integers that describe array 's elements.

Constraints

1 <= N <= 1000

1 < A[i] <= 10000, where A[i] is the i(th) integer in the array.

Output Format

Print the elements of array A in reverse order as a single line of space-separated numbers.

Sample Input

4 1 4 3 2

Sample Output

2 3 4 1

N길이의 A라는 공백으로 구분된 배열을 준다.

받은 배열을 뒤집어서 출력하여준다.

import java.io.*; import java.math.*; import java.security.*; import java.text.*; import java.util.*; import java.util.concurrent.*; import java.util.function.*; import java.util.regex.*; import java.util.stream.*; import static java.util.stream.Collectors.joining; import static java.util.stream.Collectors.toList; public class Solution { public static void main(String[] args) throws IOException { BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in)); int n = Integer.parseInt(bufferedReader.readLine().trim()); List arr = Stream.of(bufferedReader.readLine().replaceAll("\\s+$", "").split(" ")) .map(Integer::parseInt) .collect(toList()); Collections.reverse(arr); for(int num : arr) { System.out.print(num + " "); } bufferedReader.close(); } }

from http://do-hyeon.tistory.com/204 by ccl(A) rewrite - 2021-10-02 20:27:43