Your comment prompted me to check for performance issues and unnecesary calculations. A slight optimization on sum of the digits did the trick. Thanks a lot for the help!
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the hint is only do the river calculation on the smaller one, and break when the two finally are equal
Thanks for all the hints above
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Itâs a very interesting problem. I solved it successfully in C.
I wonder if there are some pair of number that donât converge.
I tried 1 and 3 and loops forever. I donât know if the meeting point is too big or doesnât exist.
The convergence is a lot earlier than you think!