HackerRank Set And Map 1.Ransom Note

題目連結：Hash Tables: Ransom Note | HackerRank

這APCS應該不會考吧？

void checkMagazine(vector<string> magazine, vector<string> note) {
    unordered_map<string,int> m,n;
    for(auto a:magazine){
        m[a]++;
    }
    for(auto a:note){
        n[a]++;
    }

    for(auto a:n){
        if(m[a.first]<n[a.first]){
            cout<<"No\n";
            return;
        }
    }
    cout<<"Yes\n";
}