What's wrong in this code?
#include <bits/stdc++.h>
using namespace std;
int main () {
    setlocale(LC_ALL, "Russian");
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    string k;
    map <int,int> mp;
    int i,j,m,n,s=0;
    cin>>n;
    for (i=0;i<n;i++){
        cin>>j;
        mp[j]=1;
    }
    cin>>m;
    for (i=0;i<m;i++){
        cin>>s;
        if (mp[s]>=1)
            mp[s]++;

    }
    int d=0;
    for (auto q:mp){
        if (q.second>1)
            cout<<q.second-1<<endl;
        else
            d++;
    }
    if (d==mp.size()) cout<<0<<endl;
}