无法重现 UVa Online Judge 给我的运行时错误 [英] Can't reproduce a runtime error that UVa Online Judge gives me

问题描述

对于 UVa Online Judge 问题的 Java 解决方案，我遇到了运行时错误.我已经完成了问题 100它对我有用.任何可能导致问题的想法?

I am getting runtime errors for my Java solutions to UVa Online Judge problems. I have finished Problem 100 and it works on my end. Any ideas what could be causing the problem?

import java.util.ArrayList;
import java.util.Hashtable;
import java.util.Scanner;

class P100 {

    public static void main(String args[]) {
        Hashtable<Integer, Integer> solutions = new Hashtable<Integer, Integer>();
        Scanner input = new Scanner(System.in);

        while (input.hasNextInt()) {
            int lowerBound = input.nextInt();
            int upperBound = input.nextInt();

            int longestCount = 0;

            for (int i = lowerBound; i <= upperBound; i++) {
                int n = i;
                int count = 1;

                ArrayList<Integer> sequence = new ArrayList<Integer>();

                while (n != 1) {
                    if (solutions.containsKey(n)) {
                        count += solutions.get(n) - 1;
                        break;
                    }

                    sequence.add(n);

                    count += 1;
                    if (n % 2 == 0) n /= 2;
                    else n = 3 * n + 1;
                }

                for (int j = 0; j < sequence.size(); j++) {
                    solutions.put(sequence.get(j), count - j);
                }

                if (count > longestCount) longestCount = count;

                solutions.put(i, count);
            }

            System.out.printf("%d %d %d\n", lowerBound, upperBound, longestCount);
        }
    }

}

推荐答案

需要重命名

class P100

到

public class Main

当您将代码复制到 UVa 中时，它会告诉您未找到 Main 类.这样判断才能运行你的代码(因为java需要知道类名).我自己有时会忘记这样做.

when you copy the code into UVa or it will tell you that the class Main was not found. This is so the judge can run your code (because java needs to know the class name). I myself forget to do this sometimes.

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