Learned from Solution 883700, by Tim. run this just for checking: I reckon that function "sum" in that solution is redundant, and my guessing seems to be right.
Quick response! Seems 0 is better than infinity...
lol~ yes, in terms of code size, 0 is better than Inf :-)
Find the peak 3n+1 sequence value
Angle of triangle
2 b | ~ 2 b
Check if number exists in vector
Replicate elements in vectors
Number construction II
Sum of logarithms
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