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I have this problem accepted in Java on Programming Challenges website but get runtime error on UVA online judge. Here's the code. Can someone help?

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Scanner;

class Main implements Runnable{

public static ...

I have code that gets accepted. But one little modification gives me WA, not sure why.

Here's the code that gets accepted:
[cpp]
/* @JUDGE_ID: 48307RK 10038 C++ "Jolly Jumpers" */

/* @BEGIN_OF_SOURCE_CODE */

#include <cstdio>
#include <string>
#include <cmath>

const int MAX_SEQ_SIZE = 4000 ...