Add Most Common Word

Author: ocimen

LeetCode/819-MostCommonWord.cs

@@ -0,0 +1,29 @@
+// Problem: https://leetcode.com/problems/most-common-word/
+using System.Collections.Generic;
+using System.Linq;
+using System.Text.RegularExpressions;
+
+namespace LeetCode {
+ public partial class Solution {
+ public string MostCommonWord(string paragraph, string[] banned) {
+ var wordList = Regex.Replace(paragraph, @"[^\w\s]", " ").ToLower().Split(' ');
+ var wordCount = new Dictionary<string, int>();
+ var bannedList = banned.ToList();
+ 
+ for(int i = 0; i < wordList.Length; i++) {
+ if(wordList[i] == string.Empty || bannedList.Contains(wordList[i])) {
+ continue;
+ }
+ if(wordCount.ContainsKey(wordList[i])) {
+ var value = wordCount.GetValueOrDefault(wordList[i]);
+ wordCount[wordList[i]] = value + 1;
+ }
+ else {
+ wordCount.Add(wordList[i], 1); 
+ } 
+ }
+ 
+ return wordCount.OrderByDescending(x => x.Value).FirstOrDefault().Key; 
+ }
+ }
+}

README.md

@@ -10,6 +10,7 @@ LeetCode C# solutions
 |**509**| **[Fibonacci Number](https://leetcode.com/problems/fibonacci-number/)** | **[C#](https://github.com/ocimen/leetcode/blob/main/LeetCode/509-FibonacciNumber.cs)** | **Easy** |
 |**682**| **[Baseball Game](https://leetcode.com/problems/baseball-game/)** | **[C#](https://github.com/ocimen/leetcode/blob/main/LeetCode/682-BaseballGame.cs)** | **Easy** |
 |**771**| **[Jewels and Stones](https://leetcode.com/problems/jewels-and-stones/)** | **[C#](https://github.com/ocimen/leetcode/blob/main/LeetCode/771-JewelsAndStones.cs)** | **Easy** |
+|**819**| **[Most Common Word](https://leetcode.com/problems/most-common-word/)** | **[C#](https://github.com/ocimen/leetcode/blob/main/LeetCode/819-MostCommonWord.cs)** | **Easy** |
 |**876**| **[Middle of the Linked List](https://leetcode.com/problems/middle-of-the-linked-list/)** | **[C#](https://github.com/ocimen/leetcode/blob/main/LeetCode/876-MiddleLinkedList.cs)** | **Easy** |
 |**933**| **[Number of Recent Calls](https://leetcode.com/problems/number-of-recent-calls/)** | **[C#](https://github.com/ocimen/leetcode/blob/main/LeetCode/933-NumberofRecentCalls.cs)** | **Easy** |
 |**1108**| **[Defanging an IP Address](https://leetcode.com/problems/defanging-an-ip-address/)** | **[C#](https://github.com/ocimen/leetcode/blob/main/LeetCode/1108-DefangingAnIPAddress.cs)** | **Easy** |