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 :-)
Replace NaNs with the number that appears to its left in the row.
radius of a spherical planet
Sorted highest to lowest?
Replace May with April
Back to basics 25 - Valid variable names
The sliding puzzle: 15
The sliding puzzle: 3D
The glass half full
Return the sequence element I
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