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Datatähti 2018 alku

Start:2017-10-02 00:00:00
End:2017-10-16 00:00:00
 

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CSES - Datatähti 2018 alku - Results
History
2017-10-04 17:41:50100
2017-10-03 21:52:4337
2017-10-03 21:50:190
2017-10-03 21:26:320
2017-10-03 21:20:0412
Task:Kyselyt
Sender:tuomask
Submission time:2017-10-04 17:41:50
Language:Java
Status:READY
Score:100

Feedback

groupverdictscore
#1ACCEPTED12
#2ACCEPTED25
#3ACCEPTED63

Test results

testverdicttime (s)group
#1ACCEPTED0.22 / 1.001details
#2ACCEPTED0.21 / 1.002details
#3ACCEPTED0.24 / 1.003details

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
480
280
237
204
134
210
565
640
784
508
846
532
465
952
205
...
view   save

correct output
0
1
7
7
6
1
5
4
7
6
2
2
2
2
8
2
1
3
1
8
...
view   save

user output
0
1
7
7
6
1
5
4
7
6
2
2
2
2
8
2
1
3
1
8
...
view   save

Test 2

Group: 2

Verdict: ACCEPTED

input
1000
615664
916441
627600
279508
126605
944125
25887
440405
352957
206746
951305
821686
716797
333476
430123
167570
619834
411383
459670
...
view   save

correct output
1
2
3
2
2
8
7
9
8
3
7
1
9
8
4
3
1
9
9
6
...
view   save

user output
1
2
3
2
2
8
7
9
8
3
7
1
9
8
4
3
1
9
9
6
...
view   save

Test 3

Group: 3

Verdict: ACCEPTED

input
1000
672274832941907421
260504693279721732
646999966092970935
100853063389774434
469646937576313460
292789544562527987
202678876957048242
921044261294332160
293497307441838185
889420403130803486
887773296767104352
272588988734184089
900854413164191389
306838570888252671
321818592757748092
632312861733842235
590425060048634753
921705179835679834
711775852688052272
...
view   save

correct output
7
2
2
0
9
7
7
2
0
4
0
3
0
5
9
9
3
1
2
7
...
view   save

user output
7
2
2
0
9
7
7
2
0
4
0
3
0
5
9
9
3
1
2
7
...
view   save