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funny flies 23 ffly challenge
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by
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dustin
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DUSTIN                            2022-08-21 12:14
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THA REVERSE CHALLENGE OF "FUNNY FLIES 21": FIREFLIES ARE FORCED ONTO A RECTANGULAR PATH BY NOTHING BUT BUTTERFLIES AS OBSTACLES.  
  
IT LOOKS VERY NICE TO ME! BUT HERE WE CLEARLY SEE A "PARITY PROBLEM": WHEN THE FLIES COME TO THE BOTTOM-LEFT CORNER FOR THE FIRST TIME, EVERYTHING WORKS WELL, BUT THE SECOND TIME, THE TIMING HAS CHANGED AND THE FORMATION BREAKS.   
  
THERE SEEMS TO BE NO (EASY) SOLUTION THAT WORKS ETERNALLY. IF THE SINGLE BUTTERFLY IN THE BOTTOM-LEFT CORNER IS REPLACED BY A VORTEX, IT WON'T STAY STABLE WHEN THE FIREFLIES COME.   
  
AT THE TOP-RIGHT, THE VORTEX WORKS FINE - IT STAYS STABLE WHEN THE FIREFLIES COME.  
  
THE NEXT "FUNNY FLIES" EPISODE WILL SHOW A WAY TO MAKE THE FORMATION ETERNAL, BUT AT THE COST OF PUTTING FIREFLIES INTO THE BOTTOM-LEFT CORNER. SO THAT WON'T SOLVE THE CHALLENGE EITHER, BUT IT COMES CLOSE... :D  
  
BTW, TO SOLVE THE CAVE, ^ MUST TAKE THE OPPORTUNITY WHEN IT ARISES!

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DUSTIN                            2022-08-22 14:27
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SOLUTION FREE :)