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How to form the recursion tree for this type of problems ?

I am trying to solve this problem on topcoder.I read the editorial but I am not able to get the recurrence.Can any please help in finding the recursion tree for this type of problems.

asked 10 Jan '16, 10:30

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question asked: 10 Jan '16, 10:30

question was seen: 741 times

last updated: 10 Jan '16, 10:30