Sort Colors

public class Solution {    public void sortColors(int[] A) {        int r=0;        int b=A.length-1;        int i=0;        while(i<=b){            if(A[i]==0){                swap(A,r,i);                r++;                i++;            }else{                if(A[i]==2){                    swap(A,b,i);                    b--;                                   }                else{                    i++;                }            }        }    }    public void swap(int[] A,int a,int b){        int tmp=A[a];        A[a]=A[b];        A[b]=tmp;    }}

Given an array with n objects colored red, white or blue, sort them so that objects of the same color are adjacent, with the colors in the order red, white and blue.

Here, we will use the integers 0, 1, and 2 to represent the color red, white, and blue respectively.

Note:
You are not suppose to use the library's sort function for this problem.

左右指针 从头开始依次判断 若为0则置于左边 若为2 则置于右边 代码如下：