3.2.43 #

public static TKey MostFrequentlyKey<TKey>(IST<TKey, int> st, TKey[] keys)
{
    foreach (var s in keys)
    {
        if (st.Contains(s))
            st.Put(s, st.Get(s) + 1);
        else
            st.Put(s, 1);
    }

    var max = keys[0];
    foreach (var s in st.Keys())
        if (st.Get(s) > st.Get(max))
            max = s;

    return max;
}