Medium csharp

Dictionary — word count #2

Problem

Count occurrences with Dictionary<string,int>.

Hints

TryGetValue or dict[key]

Your practice code

Ready — edit the code above and click Run.

Solution

using System;

class Program
{
    static void Main()
    {
        using System.Collections.Generic;
        var freq = new Dictionary<string, int> { ["a"] = 2, ["b"] = 1 };
        Console.WriteLine(freq["a"]);
    }
}

Try solving on your own first, then reveal the official answer.

Explanation

Dictionary gives O(1) average lookup—hash map interviews.

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