题解 | #最长无重复子数组#

package main

func maxLength(arr []int) int {
	ma := make(map[int]int)
	res := 0
	st := -1
	for i,val := range arr {
		pos,has := ma[val]
		if has {
			if st < pos {
				st = pos 
			}
		}
		ma[val] = i
		if res < i - st {
			res = i - st 
		}
	}
	return res 
}