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-   -   September 2021 (https://www.mersenneforum.org/showthread.php?t=27116)

 Xyzzy 2021-09-02 11:05

September 2021

[url]https://www.research.ibm.com/haifa/ponderthis/challenges/September2021.html[/url]

 dg211 2021-09-07 14:07

I'd be interested to see what the best values people can find are. My best solutions so far are 40 and 149.

 Dieter 2021-09-13 09:57

[QUOTE=dg211;587442]I'd be interested to see what the best values people can find are. My best solutions so far are 40 and 149.[/QUOTE]

That are very good values. I'm happy to have found a 50-solution this morning - too late for being listed.
It's consoling for me that there are not many solvers until 11/09.
I have no code producing a complete solution, but only codes optimizing versions found with pencil and paper.

 dg211 2021-09-13 10:12

Yeah, I think this is one of the toughest puzzles there has been recently.

I slightly improved the bonus solution to 147, but I'm still on 40 for the first part.

 Kebbaj 2021-09-13 18:10

I'm blocked at 54 damage. Normal pencil and paper cannot give a solution easily.
I only want to abandoned. So Difficult question!!

[8976 "," 4238 "," 8297 "," 4735 "," 3279 "]
31415926535897932384626433832795028841971693993751058209749445923078164
3-2-79-4735897642384735423832793-2798-97-68297473--582-9747354753-89-76
54 damage.

This solution does not spoil the challenge, it's blocked at 54.We have to start at the beginning, if we want another winning solution. But it can help!:smile:

 dg211 2021-09-13 18:36

Remember you can use hyphens in both strings.

I'm impressed people managed to get solutions that good with pen and paper, I didn't even try that approach because I thought it would be too hard.

 Kebbaj 2021-09-13 20:12

[QUOTE=dg211;587822]Remember you can use hyphens in both strings.

I'm impressed people managed to get solutions that good with pen and paper, I didn't even try that approach because I thought it would be too hard.[/QUOTE]

I am also impressed by the strength of formalizing the question and being able to code it. A question not easy to formalize.
But there, I'am obliged to get help with the calculation.
There are 1680 possible permutations from 2 to 9 for each quadruplet. I leave the 0's and 1's, they don't do a lot of damage.

Congrats, for this impressed solution 40 and 147.

 Dieter 2021-09-14 05:39

[QUOTE=Kebbaj;587819]I'm blocked at 54 damage. Normal pencil and paper cannot give a solution easily.
I only want to abandoned. So Difficult question!!

[8976 "," 4238 "," 8297 "," 4735 "," 3279 "]
31415926535897932384626433832795028841971693993751058209749445923078164
3-2-79-4735897642384735423832793-2798-97-68297473--582-9747354753-89-76
54 damage.

This solution does not spoil the challenge, it's blocked at 54.We have to start at the beginning, if we want another winning solution. But it can help!:smile:[/QUOTE]

Your last 4735 has changed to 4753 ("Zahlendreher"), but without consequences for the damage.

 Kebbaj 2021-09-14 09:49

[QUOTE=Dieter;587841]Your last 4735 has changed to 4753 ("Zahlendreher"), but without consequences for the damage.[/QUOTE]

"Unaufmerksamkeitsfehler" "خطء فني"
Well seen this Permutation typing error without consequences for the damage. Thanks Dieter!
Question:
Can we find less than 54 damage without any pulling on the sequance pi?
**
Congrats Dieter, for solving with the manual "to tear out"!

 Kebbaj 2021-09-14 14:48

I'm stubborn as a mule!

Finally, I had score 50, with a lot of damage to my neurons !!
Nice Challenge sept 2021.

I can go to work now!!
Liberation!:smile:

 kruoli 2021-09-14 15:33

[QUOTE=Kebbaj;587845]"Unaufmerksamkeitsfehler"[/QUOTE]

Personally, I never heard that word. But as always with German compound words, it is understandable. I'd suggest "Flüchtigkeitsfehler", which of course is slightly different, literally, but more about what you wanted, I think.
[/PEDANTIC]

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