Java array 有朋友会的吗?

太痛苦了 这一题写了一上午还是有问题 各位帮忙看看哇
0基础刚入门两周 写了一上午真的崩溃

Magical Series

In this task, we need to check whether a given series is a Magical Series.

A magical series of size n is a permutation of integers [0, n-1] such that the differences between adjacent integers are a permutation of [1, n-1].

Example:

Consider a series of 6 integers (4, 2, 3, 0, 5, 1). As we can see from the above figure, the differences between adjacent integers are a permutation of [1, 5]. So, this is a Magical Series of size 6.

Input:

The input will have 2 lines. 

First line contains the size (N) of a series and 
The second line contains a series of N integers.
Output:

The first line must contain a positive non-zero integer, N > 1. If not, print "Error in input" and quit the program.

The second line must contain exactly N non-negative integers. If not, print "Invalid input" and quit the program.

After making sure the inputs are valid, check whether the given series satisfies all the conditions of a magical series. 

If yes, print "It is a Magical Series". 
Otherwise print "It is not a Magical Series". 
Sample Input1:
6
4 2 3 0 5 1

Sample output1:
It is a Magical Series
Sample Input2:
11
3 7 4 6 5 0 10 1 9 2 8

Sample output2:
It is a Magical Series
Sample Input3:
-3
0 1 3

Sample output3:
Error in input
Sample Input4:
3
0 -1 3

Sample output4:
Invalid input
Sample Input5:
6
5 0 4 3 1 2

Sample output5:
It is not a Magical Series


重复的问题

【以下回答由 GPT 生成】

首先,我们看到输入包含两行内容,第一行是一个正整数N,表示序列的长度,第二行是N个非负整数,表示序列中的元素。

我们可以按照以下步骤来解决这个问题:

  1. 首先,我们需要读取输入,并将其解析为两个变量,一个是序列的长度N,另一个是包含N个非负整数的数组。我们可以使用Scanner类来读取输入,并使用split方法将第二行的内容解析为一个字符串数组。
import java.util.Scanner;

// 读取输入
Scanner scanner = new Scanner(System.in);
int N = scanner.nextInt();
scanner.nextLine(); // 清空输入缓冲区
String[] input = scanner.nextLine().split(" ");

// 将字符串数组解析为整数数组
int[] sequence = new int[N];
for (int i = 0; i < N; i++) {
    sequence[i] = Integer.parseInt(input[i]);
}
  1. 接下来,我们需要检查输入的有效性。首先,我们需要确保序列的长度N大于1。如果N不满足这个条件,我们可以直接输出"Error in input"并退出程序。
// 检查输入的有效性
if (N <= 1) {
    System.out.println("Error in input");
    System.exit(0);
}
  1. 然后,我们需要确保输入的序列中所有的元素都是非负整数。我们可以使用一个循环遍历整个序列,如果发现任何一个元素小于0,我们可以直接输出"Invalid input"并退出程序。
for (int i = 0; i < N; i++) {
    if (sequence[i] < 0) {
        System.out.println("Invalid input");
        System.exit(0);
    }
}
  1. 最后,我们需要检查给定的序列是否满足魔法序列的所有条件。我们可以通过比较相邻整数之间的差来判断是否满足条件。我们可以使用一个循环遍历整个序列,对于每一个元素,我们可以计算它与下一个元素之间的差,并检查这个差是否在[1, N-1]的范围内。如果发现任何一个差不在这个范围内,我们可以直接输出"It is not a Magical Series"并退出程序。如果所有的差都在这个范围内,我们可以输出"It is a Magical Series"。
boolean isValid = true;
for (int i = 0; i < N-1; i++) {
    int diff = Math.abs(sequence[i] - sequence[i+1]);
    if (diff < 1 || diff > N-1) {
        isValid = false;
        break;
    }
}

if (isValid) {
    System.out.println("It is a Magical Series");
} else {
    System.out.println("It is not a Magical Series");
}

完整的代码如下所示:

import java.util.Scanner;

public class MagicalSeries {
    public static void main(String[] args) {
        // 读取输入
        Scanner scanner = new Scanner(System.in);
        int N = scanner.nextInt();
        scanner.nextLine(); // 清空输入缓冲区
        String[] input = scanner.nextLine().split(" ");

        // 将字符串数组解析为整数数组
        int[] sequence = new int[N];
        for (int i = 0; i < N; i++) {
            sequence[i] = Integer.parseInt(input[i]);
        }

        // 检查输入的有效性
        if (N <= 1) {
            System.out.println("Error in input");
            System.exit(0);
        }

        for (int i = 0; i < N; i++) {
            if (sequence[i] < 0) {
                System.out.println("Invalid input");
                System.exit(0);
            }
        }

        // 检查魔法序列的条件
        boolean isValid = true;
        for (int i = 0; i < N-1; i++) {
            int diff = Math.abs(sequence[i] - sequence[i+1]);
            if (diff < 1 || diff > N-1) {
                isValid = false;
                break;
            }
        }

        // 输出结果
        if (isValid) {
            System.out.println("It is a Magical Series");
        } else {
            System.out.println("It is not a Magical Series");
        }
    }
}

希望这个解决方案对你有帮助!如果你有任何问题,请随时提问。



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