package q1493

func longestSubarray(nums []int) int {
	prev, cur := 0, 0
	longest := 0
	has0 := false
	for _, a := range nums {
		if a == 1 {
			cur++
		}
		longest = max(longest, prev+cur)
		if a == 0 {
			prev, cur = cur, 0
			has0 = true
		}
	}

	if !has0 {
		longest--
	}
	return longest
}

var _ = longestSubarray