I'm getting runtime error (NZEC) when running the following code over at SPOJ. I'd be very thankful if any of you would kindly point out what's going on.
//0<=A<=B<=10^18, 1<=N<=10^18
using System;
class any
{
static void Main()
{
long t = long.Parse(Console.ReadLine());
ulong a, b, n;
for(long k = 0; k < t; k++)
{
string[]s = Console.ReadLine().Split(' ');
a = ulong.Parse(s[0]);
b = ulong.Parse(s[1]);
n = ulong.Parse(s[2]);
Console.WriteLine(diviEntre2(a, b, n));
}
}
static ulong diviEntre2(ulong f, ulong c, ulong n)
{
ulong k, s, m;
if (f == c && c % n == 0 && f != 0) k = c/n;
else
{
s = f/n;
m = c/n;
k = m - s;
}
return k;
}
}
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