acwing154. 滑动窗口

#include<iostream>
using namespace std;

const int N=1e6+10;
int a[N],q[N],n,k;
int main(){
    cin>>n>>k;
    for(int i=0;i<n;i++){
        scanf("%d",&a[i]);
    }
    int hh=0,tt=-1;
    for(int i=0;i<n;i++){
        if(hh<=tt&&i-k+1>q[hh])hh++;
        while(hh<=tt&&a[q[tt]]>=a[i])tt--;
        q[++tt]=i;
        if(i>=k-1)printf("%d ",a[q[hh]]);
    }
    puts("");
    hh=0,tt=-1;
    for(int i=0;i<n;i++){
        if(hh<=tt&&i-k+1>q[hh])hh++;
        while(hh<=tt&&a[q[tt]]<=a[i])tt--;
        q[++tt]=i;
        if(i>=k-1)printf("%d ",a[q[hh]]);
    }
    
    return 0;
}