public static List<int> acmTeam(List<string> topic)
{
        int m = topic.Count; // member count
        int t = topic[0].Length; // topic count
        List<int> teams = new(); // team known topic counts
        for(int i=0; i < m-1; i++)
        {
                for(int j=i+1; j < m; j++)
                {
                    int known = 0;
                    for(int k=0; k < t; k++)
                    {
                        if(topic[i][k]=='1' || topic[j][k]=='1')
                        {
                                known++;
                                continue;
                        }
                    }
                    teams.Add(known);   
                }
        }
        int max = teams.Max();
        int count = teams.Count(t=> t==max);
        return new List<int>{ max, count };
}