Help me in solving CNR problem

help
,
1

My issue

what is the value range about m?

My code

using System;

public class Test
{
	public static void Main()
	{
		// your code goes here
	}
}

Problem Link: Combinatorial Numbers Practice Coding Problem - CodeChef

2

@mxcpy
it can be calculate with the smallest string u make using k ones.
So there is no point for giving the value of m.

3

for this problem, m may be larger than 64-bit integer.