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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Interface
{
class MyClass : IComparable
{
private int key;
private int value;
public int CompareTo(object obj)
{
MyClass target = obj as MyClass;
if (target == null)
throw new InvalidCastException();
return this.key.CompareTo(target.key);
}
}
}