题解 | #滑动窗口的最大值#

#include <deque>
#include <vector>
class Solution {
public:
    /**
     * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
     *
     * 
     * @param num int整型vector 
     * @param size int整型 
     * @return int整型vector
     */
    vector<int> maxInWindows(vector<int>& num, int size) {
        // write code here
        vector<int> res;
        if (size > num.size() || size == 0) {
            return res;
        }
        deque<int> window;
        for (int i = 0; i < size; i++) {
            while(!window.empty() && num[window.back()] < num[i]) {
                window.pop_back();
            }
            window.push_back(i);
        }
        res.push_back(num[window.front()]);
        for (int i = size; i < num.size(); i++) {
            while(!window.empty() && num[window.back()] < num[i]) {
                window.pop_back();
            }
            while(!window.empty() && i - window.front() >= size) {
                window.pop_front();
            }
            window.push_back(i);
            res.push_back(num[window.front()]);
        }
        return res;
    }
};