FilesExpand file tree

 master

/

CountAndSay.java

Copy path

Blame

More file actions

Blame

More file actions

Latest commit

 

History

History

History

51 lines (48 loc) · 1.39 KB

 master

/

CountAndSay.java

Copy path

Top

File metadata and controls

• Code
• Blame

51 lines (48 loc) · 1.39 KB

Raw

Copy raw file

Download raw file

Open symbols panel

Edit and raw actions

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

package string;

/**

* Created by gouthamvidyapradhan on 20/01/2018.

*

* <p>The count-and-say sequence is the sequence of integers with the first five terms as following:

*

* <p>1. 1 2. 11 3. 21 4. 1211 5. 111221 1 is read off as "one 1" or 11. 11 is read off as "two 1s"

* or 21. 21 is read off as "one 2, then one 1" or 1211. Given an integer n, generate the nth term

* of the count-and-say sequence.

*

* <p>Note: Each term of the sequence of integers will be represented as a string.

*

* <p>Example 1:

*

* <p>Input: 1 Output: "1" Example 2:

*

* <p>Input: 4 Output: "1211"

*/

public class CountAndSay {

/**

* Main method

*

* @param args

*/

public static void main(String[] args) throws Exception {

System.out.println(new CountAndSay().countAndSay(4));

}

public String countAndSay(int n) {

String result = "1";

for (int i = 1; i < n; i++) {

int count = 1;

char num = result.charAt(0);

StringBuilder temp = new StringBuilder();

for (int j = 1, l = result.length(); j < l; j++) {

if (result.charAt(j) == num) {

count++;

} else {

temp = temp.append(String.valueOf(count)).append(String.valueOf(num));

num = result.charAt(j);

count = 1;

}

}

temp = temp.append(String.valueOf(count)).append(String.valueOf(num));

result = temp.toString();

}

return result;

}

}