
class Solution:
def longestSubarray(self, nums: List[int]) -> int:
ans = 0
tmp = 0
idx = -1
for i in range(len(nums)):
if nums[i] == 1:
tmp += 1
else:
tmp = i - idx - 1
idx = i
ans = max(ans, tmp)
return ans if idx != -1 else ans - 1