Kyselyt

import java.util.*;
/*
 * Datatähti 2018
 * Tuomas Karjalainen, Nurmeksen lukio
 */
public class Kyselyt {
  public static void main(String[] args) {
    Scanner input = new Scanner(System.in);
    int queries = Integer.parseInt(input.nextLine());
    while (queries-- > 0) {
      long k = Long.parseLong(input.nextLine());
      System.out.println(query(k));
    }
  }

  private static char query(long k) {
    long index = 1;
    long currentNumber = 1;
    while (index + numberLength(currentNumber) <= k) {
      index += numberLength(currentNumber);
      currentNumber++;
    }
    return Long.toString(currentNumber).charAt((int)(k - index));
  }

  private static long numberLength(long number) {
    long length = 0;
    while (number > 0) {
      number /= 10;
      length++;
    }
    return length;
  }
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 3

Group: 3

Verdict: TIME LIMIT EXCEEDED