Leetcode

题目

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.

解析

class Solution01 {    public void sortColors(int[] nums) {        //计数排序思路：        //创建一个数组count用来统计0，1，2出现的次数        //然后将0，1，2按顺序传值进原数组        int count[] = new int[3];        for(int n : nums){            count[n]++;        }        int index = 0;        for(int j = 0; j < 3; j++){            for(int i = 0; i < count[j] ; i++){                nums[index++] = j;            }        }    }}