滑动窗口的最大值 牛客网 剑指Offer

滑动窗口的最大值 牛客网 剑指Offer

• 题目描述
• 给定一个数组和滑动窗口的大小，找出所有滑动窗口里数值的最大值。例如，如果输入数组{2,3,4,2,6,2,5,1}及滑动窗口的大小3，那么一共存在6个滑动窗口，他们的最大值分别为{4,4,6,6,6,5}； 针对数组{2,3,4,2,6,2,5,1}的滑动窗口有以下6个： {[2,3,4],2,6,2,5,1}， {2,[3,4,2],6,2,5,1}， {2,3,[4,2,6],2,5,1}， {2,3,4,[2,6,2],5,1}， {2,3,4,2,[6,2,5],1}， {2,3,4,2,6,[2,5,1]}

class Solution:
    def maxInWindows(self, num, size):
        if not num or size <= 0:
            return []
        deque = []
        last_max_index = -1
        if len(num) >= size:
            for i in range(len(num)-size+1):
                if last_max_index >= i:
                    v = num[i+size-1]
                    if v >= num[last_max_index]:
                         last_max_index = i+size-1
                    deque.append(num[last_max_index])
                else:
                    max_value = num[i]
                    for j in range(1,size):
                        v = num[i+j]
                        if v > max_value:
                            max_value = v
                            last_max_index = i+j
                    deque.append(max_value)
        return deque

    def maxInWindows2(self, num, size):
        if not num or size <= 0:
            return []
        deque = []
        if len(num) >= size:
            for i in range(len(num)-size+1):
                max_value = num[i]
                for j in range(1,size):
                    v = num[i+j]
                    if v > max_value:
                        max_value = v
                        last_max_index = i+j
                deque.append(max_value)
        return deque