Merge pull request neetcode-gh#2045 from alexprudhomme/0290-word-patt…

…ern.cs

Create: 0290-word-patterns.cs

csharp/0290-word-pattern.cs

@@ -0,0 +1,23 @@
+public class Solution {
+ public bool WordPattern(string pattern, string s) {
+ var words = s.Split(' ');
+ if (words.Length != pattern.Length) return false;
+
+ Dictionary<char,string> charToWord = new Dictionary<char, string>();
+ Dictionary<string, char> wordToChar = new Dictionary<string, char>();
+
+ for (int i = 0; i < pattern.Length; i++) {
+ char c = pattern[i];
+ string w = words[i];
+ if (charToWord.ContainsKey(c) && (charToWord[c] != w)) {
+ return false;
+ }
+ if(wordToChar.ContainsKey(w) && (wordToChar[w] != c)) {
+ return false;
+ }
+ charToWord[c] = w;
+ wordToChar[w] = c;
+ }
+ return true;
+ }
+}