819-MostCommonWord.cs

// Problem: https://leetcode.com/problems/most-common-word/
usingSystem.Collections.Generic;
usingSystem.Linq;
usingSystem.Text.RegularExpressions;

namespaceLeetCode{
publicpartialclassSolution{
publicstringMostCommonWord(stringparagraph,string[]banned){
varwordList=Regex.Replace(paragraph,@"[^\w\s]"," ").ToLower().Split(' ');
varwordCount=newDictionary<string,int>();
varbannedList=banned.ToList();

for(inti=0;i<wordList.Length;i++){
if(wordList[i]==string.Empty||bannedList.Contains(wordList[i])){
continue;
}
if(wordCount.ContainsKey(wordList[i])){
varvalue=wordCount.GetValueOrDefault(wordList[i]);
wordCount[wordList[i]]=value+1;
}
else{
wordCount.Add(wordList[i],1);
}
}

returnwordCount.OrderByDescending(x =>x.Value).FirstOrDefault().Key;
}
}
}