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copied!<p>I have a similar issue, but for word occurrences! so, I hope this can help. I used <code>SortedDictionary</code> and a binary search tree</p> <pre><code>/* Application counts the number of occurrences of each word in a string and stores them in a generic sorted dictionary. */ using System; using System.Text.RegularExpressions; using System.Collections.Generic; public class SortedDictionaryTest { public static void Main( string[] args ) { // create sorted dictionary SortedDictionary< string, int > dictionary = CollectWords(); // display sorted dictionary content DisplayDictionary( dictionary ); } // create sorted dictionary private static SortedDictionary< string, int > CollectWords() { // create a new sorted dictionary SortedDictionary< string, int > dictionary = new SortedDictionary< string, int >(); Console.WriteLine( "Enter a string: " ); // prompt for user input string input = Console.ReadLine(); // split input text into tokens string[] words = Regex.Split( input, @"\s+" ); // processing input words foreach ( var word in words ) { string wordKey = word.ToLower(); // get word in lowercase // if the dictionary contains the word if ( dictionary.ContainsKey( wordKey ) ) { ++dictionary[ wordKey ]; } else // add new word with a count of 1 to the dictionary dictionary.Add( wordKey, 1 ); } return dictionary; } // display dictionary content private static void DisplayDictionary< K, V >( SortedDictionary< K, V > dictionary ) { Console.WriteLine( "\nSorted dictionary contains:\n{0,-12}{1,-12}", "Key:", "Value:" ); /* generate output for each key in the sorted dictionary by iterating through the Keys property with a foreach statement*/ foreach ( K key in dictionary.Keys ) Console.WriteLine( "{0,- 12}{1,-12}", key, dictionary[ key ] ); Console.WriteLine( "\nsize: {0}", dictionary.Count ); } } </code></pre>

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