All about flooble | fun stuff | Get a free chatterbox | Free JavaScript | Avatars    
perplexus dot info

Home > Numbers > Sequences
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    
No Rating

Comments: ( Back to comment list | You must be logged in to post comments.)
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

Please log in:
Login:
Password:
Remember me:
Sign up! | Forgot password


Search:
Search body:
Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (8)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:
Copyright © 2002 - 2017 by Animus Pactum Consulting. All rights reserved. Privacy Information