75. Sort Colors
Given an array with n objects colored red, white or blue, sort them in-place 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.
Example:
Input: [2,0,2,1,1,0]
Output: [0,0,1,1,2,2]
方法一:搜索计数
时间复杂度:O(n) 两遍扫描
空间复杂度:O(1)
1 | /* |
方法二:多路搜索交换(三路快排思路)
时间复杂度:O(n) 一遍扫描
空间复杂度:O(1)
1 | /* |