panouri

#include <fstream>
using namespace std;
ifstream f("panouri.in");
ofstream g("panouri.out");
int n,k,i,t,st,nr,Min,v[200001],fr[20001],fr1[20001];
int main()
{
    f>>n>>k;
    Min=n;
    for(i=1;i<=n;i++)
        f>>v[i];
    for(i=1;i<=k;i++)
    {
        f>>t;
        fr[t]=1;
    }
    st=1;
    for(i=1;i<=n;i++)
    {
        if(fr[v[i]]==1)
        {
            fr1[v[i]]++;
            if(fr1[v[i]]==1)
                    nr++;
             if(nr==k)
                {
                    while(st<i&&(fr1[v[st]]==0||fr1[v[st]]>1))
                    {
                        fr1[v[st]]=max(0,fr1[v[st]]-1);
                        st++;
                    }
                    if(Min>i-st)
                        Min=i-st;
                }
            }

    }
    g<<Min;
    return 0;
}