using System;
using System.Collections.Generic;
namespace ConsoleApplication_C_Sharp
{
class Program
{
static void Main(string[] args)
{
var d = new Dictionary<string, int>();
d["c#"] = 1;
d["c"] = 2;
d["c++"] = 3;
Console.WriteLine(d.Count);
d.Clear();
Console.WriteLine(d.Count);
}
}
}
/*
run:
3
0
*/