package q128

func longestConsecutive(nums []int) int {
	set := make(map[int]struct{}, len(nums))
	for _, n := range nums {
		set[n] = struct{}{}
	}

	longest := 0
	for n := range set {
		if _, ok := set[n-1]; ok {
			continue
		}
		r := n
		for {
			if _, ok := set[r+1]; ok {
				r++
			} else {
				break
			}
		}
		longest = max(longest, r-n+1)
	}
	return longest
}

var _ = longestConsecutive