Minimum Operations to Maximize Last Elements in Arrays — Python

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

import itertools


# simulation
class Solution(object):
    def minOperations(self, nums1, nums2):
        """
        :type nums1: List[int]
        :type nums2: List[int]
        :rtype: int
        """
        cnt = [0]*2
        for x, y in itertools.izip(nums1, nums2):
            if not (min(x, y) <= min(nums1[-1], nums2[-1]) and max(x, y) <= max(nums1[-1], nums2[-1])):
                return -1
            if not (x <= nums1[-1] and y <= nums2[-1]):
                cnt[0] += 1
            if not (x <= nums2[-1] and y <= nums1[-1]):
                cnt[1] += 1
        return min(cnt)


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


# simulation
class Solution2(object):
    def minOperations(self, nums1, nums2):
        """
        :type nums1: List[int]
        :type nums2: List[int]
        :rtype: int
        """
        INF = float("inf")
        def count(mx1, mx2):
            return sum(1 if y <= mx1 and x <= mx2 else INF for x, y in itertools.izip(nums1, nums2) if not (x <= mx1 and y <= mx2))

        result = min(count(nums1[-1], nums2[-1]), count(nums2[-1], nums1[-1]))
        return result if result != INF else -1