public class Solution {    public bool WordPattern(string pattern, string str) {        var list = str.Split(' ').ToList();            int type1 = 0;            int type2 = 0;            StringBuilder sb1 = new StringBuilder();            StringBuilder sb2 = new StringBuilder();            Dictionary
     
       dic1 = new Dictionary
      
       ();            Dictionary
       
         dic2 = new Dictionary
        
         ();            foreach (var word in list)            {                if (!dic1.ContainsKey(word))                {                    dic1.Add(word, type1);                                         sb1.Append(type1);                    type1++;                }                else                {                    sb1.Append(dic1[word]);                }            }            foreach (var c in pattern)            {                if (!dic2.ContainsKey(c))                {                    dic2.Add(c, type2);                                        sb2.Append(type2);                    type2++;                }                else                {                    sb2.Append(dic2[c]);                }            }            if (sb1.ToString() != sb2.ToString())            {                return false;            }            else            {                return true;            }    }}