剑指offer：滑动窗口的最大值

class Solution {
public:
    vector<int> maxInWindows(const vector<int>& nums, unsigned int k)
    {
        vector<int>res;
        deque<int>q;
        int ans=100010;
        for(int i = 0; i < nums.size(); i++){
            if(!q.empty() && i-q.front() >= k)
                q.pop_front();
            while(!q.empty()&&nums[q.back()]<nums[i])
                q.pop_back();
            q.push_back(i);
            if(i >= k-1){
                res.push_back(nums[q.front()]);
                ans=min(ans,nums[q.front()]);
            }
        }
        return res;
        cout<<ans;
    }
};