nonzero return code 런타임 에러가 뜨는데 eclipse에서는 경고도 뜨지 않아서 어떻게 해결해야 할지 막막하네요 ㅜ
답변 부탁드립니다.

PI

package pi;

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

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        ArrayList<String> num = new ArrayList<>();
        int cases = sc.nextInt();
        while (cases-- > 0) {
            String input = sc.next();
            num.add(input);
        }
        // int numInt = Integer.parseInt(num);
        for (int i = 0; i < num.size(); i++) {
            String now = num.get(i);
            int sum = 0;
            while (now.isEmpty() != true) {
                int three = 11, four = 11, five = 11;
                if (now.length() > 5) {
                    three = chk(now.substring(0, 3));
                    four = chk(now.substring(0, 4));
                    five = chk(now.substring(0, 5));
                } else if (now.length() == 4) {
                    four = chk(now.substring(0, 4));
                } else {
                    three = chk(now.substring(0, 3));
                }
                if (five > four) {
                    if (four > three) {
                        now = now.substring(3);
                        sum += three;
                    } else {
                        now = now.substring(4);
                        sum += four;
                    }
                } else if (five == four) {
                    if (four > three) {
                        now = now.substring(3);
                        sum += three;
                    } else {
                        now = now.substring(5);
                        sum += five;
                    }
                } else {
                    if (three < five) {
                        now = now.substring(3);
                        sum += three;
                    } else {
                        now = now.substring(5);
                        sum += five;
                    }
                }
            }
            System.out.println(sum);
        }
        sc.close();
    }

    static public int chk(String str) {
        ArrayList<Integer> arr = new ArrayList<>();
        for (int i = 0; i < str.length(); i++) {
            int each = Integer.parseInt(str.substring(i, i + 1));
            arr.add(each);
        }
        int diff = arr.get(1) - arr.get(0);
        if (diff == 0) {
            for (int i = 2; i < arr.size(); i++) { // 11111
                if (arr.get(i - 1) == arr.get(i)) {
                    if (i == arr.size() - 1)
                        return 1;
                    else
                        continue;
                } else
                    return 10;
            }
        } else {
            if (arr.get(0) == arr.get(2)) {
                if (arr.size() == 5) {
                    if (arr.get(0) == arr.get(4) && arr.get(1) == arr.get(3))
                        return 4;
                    else
                        return 10;
                } else if (arr.size() == 4) {
                    if (arr.get(1) == arr.get(3))
                        return 4;
                    else
                        return 10;
                } else {
                    return 4;
                }
            } else {
                if (arr.get(1) - arr.get(0) == arr.get(2) - arr.get(1)) {
                    if (diff == 1 || diff == -1) {
                        if (arr.size() == 5) {
                            if (arr.get(3) - arr.get(2) == diff
                                    && arr.get(4) - arr.get(3) == diff)
                                return 2;
                            else
                                return 10;
                        } else if (arr.size() == 4) {
                            if (arr.get(3) - arr.get(2) == diff)
                                return 2;
                            else
                                return 10;
                        } else {
                            return 2;
                        }
                    } else {
                        if (arr.size() == 5) {
                            if (arr.get(3) - arr.get(2) == diff
                                    && arr.get(4) - arr.get(3) == diff)
                                return 5;
                            else
                                return 10;
                        } else if (arr.size() == 4) {
                            if (arr.get(3) - arr.get(2) == diff)
                                return 5;
                            else
                                return 10;
                        } else {
                            return 5;
                        }
                    }
                }
            }
        }
        return 0;
    }
}