How to solve http://ift.tt/1f7Wyso on spoj?

Vote count:

-1

How to solve this problem Optimal Marks. I have read topcoder discussions on it here : http://ift.tt/1f7WAR6, but still i am unable to relate it to maxflow-mincut problem. Please give a detailed explanation.Thanks :)

asked 40 secs ago

Swapnil R Mehta

157