求助！为什么有两个RE和三个WA

#include<iostream>
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<stack>
#include<queue>
#include<cmath>
#include<algorithm>
using namespace std;
deque<long long>q;
long long a[100009],n,k;
int main()
{
    cin>>n;
    scanf("%lld",&k);
    for(int i=1;i<=n;i++)
    {
        scanf("%lld",&a[i]);
    }

        for(int i=1;i<=n;i++)
    {
        while(!q.empty()&&q.front()<i-k+1)
        q.pop_front();
        while(!q.empty()&&a[q.back()]>=a[i])
        {
            q.pop_back();
        }
        q.push_back(i);
        if(i>k-1) printf("%lld ",a[q.front()]);
    }
    printf("\n");//求最小值
    q.clear();//清空
    for(int i=1;i<=n;i++)
    {
        while(!q.empty()&&q.front()<i-k+1)
        q.pop_front();
        while(!q.empty()&&a[q.back()]<=a[i])
        {
            q.pop_back();
        }
        q.push_back(i);
        if(i>k-1) printf("%lld ",a[q.front()]);
    }
    return 0;
}//求最大值

谢谢各位大佬！！