CSES - Datatähti 2018 alku - Results
Submission details
Task:Kyselyt
Sender:tuomask
Submission time:2017-10-04 17:41:50 +0300
Language:Java
Status:READY
Result:100
Feedback
groupverdictscore
#1ACCEPTED12
#2ACCEPTED25
#3ACCEPTED63
Test results
testverdicttimegroup
#1ACCEPTED0.22 s1details
#2ACCEPTED0.21 s2details
#3ACCEPTED0.24 s3details

Code

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;
    long numberLength, numberCountWithLength;
    while ((numberLength = numberLength(currentNumber)) != 0 &&
          (numberCountWithLength = numberCountWithLength(numberLength)) != 0 &&
          (index + numberCountWithLength * numberLength) <= k) {
      index += numberCountWithLength * numberLength;
      currentNumber += numberCountWithLength;
    }
    long diff = (k - index);
    index += diff - diff % numberLength(currentNumber);
    currentNumber += diff / (long) numberLength(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;
  }

  private static long numberCountWithLength(long length) {
    return 9 * (long) Math.pow(10, length - 1);
  }
}

Test details

Test 1

Group: 1

Verdict: ACCEPTED

input
1000
582
214
723
273
...

correct output
0
1
7
7
6
...

user output
0
1
7
7
6
...

Test 2

Group: 2

Verdict: ACCEPTED

input
1000
615664
916441
627600
279508
...

correct output
1
2
3
2
2
...

user output
1
2
3
2
2
...

Test 3

Group: 3

Verdict: ACCEPTED

input
1000
672274832941907421
260504693279721732
646999966092970935
100853063389774434
...

correct output
7
2
2
0
9
...

user output
7
2
2
0
9
...