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Optimal Order (Posted on 2016-02-10) Difficulty: 4 of 5

Consider Erase the right 90

Find a sequence of the numbers from 1 to 100, not necessarily in that order, such that exactly ten groups of 10 form exactly ten distinct subsequences, which need not be continuous, in each of strictly increasing and strictly decreasing order.

List the 20 subsequences.

No Solution Yet Submitted by broll    
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re(2): This should work | Comment 4 of 5 |
(In reply to re: This should work by Charlie)

I dunno.  I read exactly as once it had been broken into ten subsequences. 

Once I sat down and tried to find the solution - I tried three groups of 9 - I found it in just a few minutes.  It seemed too easy for a problem broll classified as D4 (It seemed D2).  That's why I didn't title my post as a solution.

I figured if it was wrong someone would tell me or if I was misreading the problem broll would tell me.

Is my solution valid or not?

  Posted by Jer on 2016-02-14 11:48:59

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