力扣239. 滑动窗口最大值

class Solution {
private:
    class MyQueue {
    public:
        deque<int> que;
        void pop(const int& pt) {
            if(!que.empty() && que.front() == pt) que.pop_front();
        }

        void push(const int& pt) {
            while(!que.empty() && que.back() < pt) que.pop_back();
            que.push_back(pt);
        }

        int getMax() {
            return que.front();
        }
    };

public:
    vector<int> maxSlidingWindow(vector<int>& nums, int k) {
        MyQueue que;
        vector<int> result;
        for(int i = 0; i < k; i++) {
            que.push(nums[i]);
        }
        result.push_back(que.getMax());
        for(int slow = 0, fast = k; fast < nums.size(); slow++, fast++) {
            que.pop(nums[slow]);
            que.push(nums[fast]);
            result.push_back(que.getMax());
        }

        return result;
    }
};