Longest Consecutive Sequence LeetCode solution in Python

1
class Solution(object):
2
    def longestConsecutive(self, nums):
3
        ans = 0
4
        nums = set(nums)
5
        count = 0
6
        for i in nums:
7
            if i - 1 not in nums:
8
                j = i
9
                count = 0
10
                while j in nums:
11
                    count += 1
12
                    j += 1
13
                ans = max(ans, count)
14
        return ans