I am familiar with c/c++ coding ,system programming..including threads(pthread.h),semaphores
I have done decent programming on SPOJ and other sites.

In which direction ,Should i think .in order to solve the problem
do i have to execute different instances of recursion as individual threads. if yes how many maximum threads are allowed.?
i have seen some TBB code samples...it contains headers files not in ANSI C ,so in order to solve these problems, do i need those header files.?