滑动窗口

leetcode 239 滑动窗口最大值

class Solution {
    public int[] maxSlidingWindow(int[] nums, int k) {
        int len = nums.length;
        int[] res = new int[len-k+1];
        Deque<Integer> deque = new LinkedList<>();
        for(int i=0;i<len;i++){
            while(deque.size()>0&&nums[deque.peekLast()]<nums[i]){
                deque.pollLast();
            }
            deque.addLast(i);
            if(i>=k-1){
                while(deque.peek()<(i-k+1)){
                    deque.poll();
                }
                res[i-k+1] = nums[deque.peek()];
            }
        }
        return res;
    }
}