FilesExpand file tree

 master

/

Solution41_2.java

Copy path

Blame

More file actions

Blame

More file actions

Latest commit

 

History

History

History

32 lines (27 loc) · 684 Bytes

 master

/

Solution41_2.java

Copy path

Top

File metadata and controls

• Code
• Blame

32 lines (27 loc) · 684 Bytes

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

package com.usher.algorithm.offer;

import java.util.LinkedList;

import java.util.Queue;

/**

* @Author: Usher

* @Description:

*/

public class Solution41_2 {

private int[] cnts = new int[256];

private Queue<Character> queue = new LinkedList<>();

//Insert one char from stringstream

public void Insert(char ch)

{

cnts[ch]++;

queue.add(ch);

while (!queue.isEmpty() && cnts[queue.peek()] > 1){

queue.poll();

}

}

//return the first appearence once char in current stringstream

public char FirstAppearingOnce()

{

if (queue.isEmpty())

return '#';

return queue.peek();

}

}