from typing import List
from collections import deque


class Solution:
    def maxSlidingWindow(self, nums: List[int], k: int) -> List[int]:
        dq = deque()
        res = []
        for i, n in enumerate(nums):
            if len(dq) > 0 and dq[0] <= i - k:
                dq.popleft()
            while dq and nums[dq[-1]] < n:
                dq.pop()

            dq.append(i)
            if i >= k - 1:
                res.append(nums[dq[0]])
        return res

    def test(self):

        for nums, k, target in [
            ([7, 2, 4], 2, [7, 4])
        ]:
            ans = self.maxSlidingWindow(nums, k)
            assert ans == target, f"target: {target}, ans: {ans}"


if __name__ == "__main__":
    Solution().test()