codechef - isolation centers

#include<bits/stdc++.h>
using namespace std;
#define fastread()(ios_base::sync_with_stdio(false),cin.tie(NULL));
#define ll long long
int main()
{
    fastread()
    ll t ;
    cin>>t;
    while (t--)
    {
        ll n,q;
        cin>>n>>q;
        string s;
        cin>>s;
        map<char,ll>mp;
        for(ll i =0;i<n;i++)mp[s[i]]++;
        while(q--)
        {
            ll x,cnt=0;
            cin>>x;
            map<char,ll>::iterator it=mp.begin();
            while(it!=mp.end())
            {
                if(it->second>x)cnt+=(it->second-x);
                it++;
            }
            cout<<cnt<<endl;
            //cnt=0;
        }
    }
}