CODE

public class WordDictionary {

  List<List<char>> dictionary;

  public WordDictionary() {
    dictionary = new List<List<char>>();
  }
  
  public void AddWord(string word) {
    List<char> w = new List<char>();
    foreach (var c in word)
      w.Add(c);
    dictionary.Add(w);        
  }
  
  public bool Search(string word) {
    foreach (var w in dictionary)
    {
      int m = 0;
      int n = 0;
      for (int i = 0; i < w.Count; i++)
      {
        if (i > word.Length-1)
          break;
        if (word[i] == '.')
        {
          n++; m++; continue;
        }
        if (word[i] != w[i])
          break;
        m++; n++;
      }
      if (m == word.Length && n == w.Count)
        return true;
    }
    return false;        
  }
}