**Source:**Asked to me by Piyush Sao (EE IITM 2011 Alumnus, Georgia Tech Grad Student). He got it from IBM Ponder This May 2012 (http://domino.research.ibm.com/Comm/wwwr_ponder.nsf/Challenges/May2012.html)

**Problem:**

There are six sets of jobs. Each set is performed on a different server and each set contains jobs that take 1,2,3,...,10 minutes to run.

Obviously, all six sets would end up in 55 minutes.

Schedule all the sets such that if all six servers start together, on minute 0, a job would end on every minute from 1 to 54, and all six servers would end on minute 55 together.

Please supply the solution as six lines of ten numbers.

A solution for a smaller problem of four sets of six jobs ending every minute from 1 to 20 is:

2 1 5 4 6 3

1 3 6 4 5 2

5 2 4 6 3 1

6 3 4 2 1 5

**Update:**(19-07-2012)

Solution posted by Piyush Sao (EE IITM 2011 Alumnus, Georgia Tech Grad Student) in comments! I could not solve it.