Kyselyt

// @author Anssi

import java.math.BigInteger;
import java.util.Scanner;

public class KyselytTehtava {

    private static int appendable = 0;
    private static StringBuilder myString;
    private static int charCount = 0;

    public static void main(String[] args) {

        Scanner input = new Scanner(System.in);

        myString = new StringBuilder(Integer.toString(appendable));

        int count = Integer.parseInt(input.nextLine());
        BigInteger[] queries = new BigInteger[count];

        for (int i = 0; i < count; i++) {

            queries[i] = new BigInteger(input.nextLine());
        }


        for (int i = 0; i < count; i++) {

            System.out.println(completeQuery(queries[i]));
        }


    }

    private static char completeQuery(BigInteger index) {

        while (true) {

            if (BigInteger.valueOf(charCount).subtract(index).compareTo(BigInteger.valueOf(0)) >= 0) {

                String tempString = Integer.toString(appendable);
                return tempString.charAt(tempString.length() - 1 - Integer.parseInt(BigInteger.valueOf(charCount).subtract(index).toString()));
            }

            charCount += Integer.toString(++appendable).length();

        }
    }

}

Test 1

Group: 1

Verdict: RUNTIME ERROR

Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of...

Test 2

Group: 2

Verdict: RUNTIME ERROR

Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of...

Test 3

Group: 3

Verdict: TIME LIMIT EXCEEDED