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NthPermutation newbie problem .. Combinatorica Package

• To: mathgroup at smc.vnet.net
• Subject: [mg49953] NthPermutation newbie problem .. Combinatorica Package
• From: BV <dont at bug.me>
• Date: Sat, 7 Aug 2004 03:51:54 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

I found that calling NthPermutation via MathLink in C++ is rather costly 
  for my purposes, therefore I'm inquiring to  re-write the function 
entirely in C++. I hope by eliminating unnecessary calls to MathLink 
this would speed up my program significantly.

As, I admit, I am not very versed in Mathematics itself can anyone point 
me in the direction where to start; how this function works; what 
formula is used, etc.
Thank you