longest-non-decreasing-subarray-from-two-arrays.py

# Time:  O(n)
# Space: O(1)

# dp
class Solution(object):
    def maxNonDecreasingLength(self, nums1, nums2):
        """
        :type nums1: List[int]
        :type nums2: List[int]
        :rtype: int
        """
        result = 1
        dp = [1]*2
        for i in xrange(len(nums1)-1):
            dp = [max((dp[0]+1 if nums1[i] <= nums1[i+1] else 1), (dp[1]+1 if nums2[i] <= nums1[i+1] else 1)),
                  max((dp[0]+1 if nums1[i] <= nums2[i+1] else 1), (dp[1]+1 if nums2[i] <= nums2[i+1] else 1))]
            result = max(result, max(dp))
        return result