时间限制是3S
数据：https://www.udebug.com/UVa/12174
求大神解答
代码

#include<iostream>
#include<cstring>
#include<cstdio>
using namespace std;
int t,n,s,pd,ans,a[100010],book[100010];
int main()
{
    freopen("uva12174.in","r",stdin);
    freopen("uva12174.out","w",stdout);
    scanf("%d",&t);
    while(t--)
    {
        scanf("%d%d",&s,&n);
        memset(a,0,sizeof a);
        memset(book,0,sizeof book);
        pd=0;ans=0;
        for(int i=1;i<=n;i++) scanf("%d",a+i);
        for(int j=1;j<=s;j++)
        {
            pd=0;
            memset(book,0,sizeof book);
            for(int i=1;i<=n;i++)
            {
                if(i==j+1||pd>=s) {memset(book,0,sizeof book); pd=0;}
                if(i<=j)
                {
                    if(book[a[i]]) break;
                    else if(a[i]) book[a[i]]=1;
                    pd++;
                }
                else
                {
                    if(book[a[i]]) break;
                    else if(a[i]) book[a[i]]=1;
                    pd++;
                }
                if(i==n)ans++;
            }
        }
        printf("%d\n",ans);
    }
    return 0;
}