代码在 IntelliJ 中有效，但在 Hackerrank 编辑器中无效

Question

我在 hackerrank 上做这个问题：https://www.hackerrank.com/challenges/ctci-bubble-sort/problem?h_l=interview&playlist_slugs%5B%5D=interview-preparation-kit&playlist_slugs%5B%5D=sorting

我用 intellij 写了解决方案，它在那里给了我正确的输出，但是当我把它复制到 hackerrank ide 时，它给了我一个错误。

这是我正在谈论的代码：

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;

class Results {

    /*
     * Complete the 'countSwaps' function below.
     *
     * The function accepts INTEGER_ARRAY a as parameter.
     */

    public static void countSwaps(List<Integer> a) {
        int count = 0;
        boolean flag = false;
        while (!flag) {
            flag = true;
            for (int i = 0; i < a.size() - 1; i++) {
                if (a.get(i) > a.get(i + 1)) {
                    int temp = a.get(i);
                    a.set(i, a.get(i + 1));
                    a.set(i + 1, temp);
                    flag = false;
                    count++;
                }
            }
        }

        System.out.println(String.format(
                "Array is sorted in %d swaps.%n" +
                        "First Element: %d%n" +
                        "Last Element: %d%n",
                count,
                a.get(0),
                a.get(a.size() - 1)));
    }

    public static 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<Integer> a = Stream.of(bufferedReader.readLine().replaceAll("\s+$", "").split(" "))
                    .map(Integer::parseInt)
                    .collect(toList());

            Results.countSwaps(a);

            bufferedReader.close();
        }
    }
}

这是错误：无法找到或加载主要 class 解决方案。

你有什么 idea 为什么我会在这里收到这个错误？我该如何解决它。

Answer 1

您已将解决方案 class 放入结果 class 中。 HackerRank 希望您将解决方案 class 作为它自己的 class，像这样：

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;

class Results {

    /*
     * Complete the 'countSwaps' function below.
     *
     * The function accepts INTEGER_ARRAY a as parameter.
     */

    public static void countSwaps(List<Integer> a) {
        int count = 0;
        boolean flag = false;
        while (!flag) {
            flag = true;
            for (int i = 0; i < a.size() - 1; i++) {
                if (a.get(i) > a.get(i + 1)) {
                    int temp = a.get(i);
                    a.set(i, a.get(i + 1));
                    a.set(i + 1, temp);
                    flag = false;
                    count++;
                }
            }
        }

        System.out.println(String.format(
                "Array is sorted in %d swaps.%n" +
                        "First Element: %d%n" +
                        "Last Element: %d%n",
                count,
                a.get(0),
                a.get(a.size() - 1)));
    }
}

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<Integer> a = Stream.of(bufferedReader.readLine().replaceAll("\s+$", "").split(" "))
                .map(Integer::parseInt)
                .collect(toList());

        Results.countSwaps(a);

        bufferedReader.close();
    }
}

请检查您的代码语法并阅读 IDE 给您的错误。它确实明确告诉您 Error: Could not find or load main class Solution 并且只需快速检查自动缩进就会向您显示问题所在。

Answer 2

在线编程竞赛平台通常要求您遵守特定的提交规则。

参见： Sample Problem Statement

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
{
  /*
   * Complete the 'countSwaps' function below.
   *
   * The function accepts INTEGER_ARRAY a as parameter.
   */

  public static void countSwaps (List < Integer > a)
  {
    int count = 0;
    boolean flag = false;
    while (!flag)
      {
    flag = true;
    for (int i = 0; i < a.size () - 1; i++)
      {
        if (a.get (i) > a.get (i + 1))
          {
        int temp = a.get (i);
          a.set (i, a.get (i + 1));
          a.set (i + 1, temp);
          flag = false;
          count++;
          }
      }
      }

    System.out.println (String.format ("Array is sorted in %d swaps.%n" +
                       "First Element: %d%n" +
                       "Last Element: %d%n",
                       count,
                       a.get (0), a.get (a.size () - 1)));
  }

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

    int n = Integer.parseInt (bufferedReader.readLine ().trim ());

      List < Integer > a =
      Stream.of (bufferedReader.readLine ().replaceAll ("\s+$",
                            "").split (" ")).
      map (Integer::parseInt).collect (toList ());

      countSwaps (a);

      bufferedReader.close ();
  }
}

error: could not find or load main class solution. 表示无法访问 Solution class 中的 main() 方法。

代码在 IntelliJ 中有效，但在 Hackerrank 编辑器中无效

Code Works in IntelliJ but Not in Hackerrank Editor

java

runtime-error