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// @Title: 颜色分类 (Sort Colors)
// @Author: 15816537946@163.com
// @Date: 2020-12-04 17:29:24
// @Runtime: 0 ms
// @Memory: 2 MB
// 荷兰国旗问题
func sortColors(nums []int) {
	if len(nums) <= 1 {
		return
	}
	lo, hi, cursor := 0, len(nums)-1, 0
	for cursor <= hi {
		if nums[cursor] == 0 {
			nums[cursor], nums[lo] = nums[lo], nums[cursor]
			lo++
			cursor++
		} else if nums[cursor] == 2 {
			nums[cursor], nums[hi] = nums[hi], nums[cursor]
			hi--
		} else {
			cursor++
		}
	}
}