Find the sum, given the first term t1, the common ratio r, and number of terms n.
If input t1=1, r=1, n=7 then output y=7
If input t1=10, r=10, n=5 then output y=111110.
Remove the air bubbles
Return the first and last character of a string
We love vectorized solutions. Problem 1 : remove the row average.
Given area find sides
How many jokers?
Distance walked 1D
Compress strings (not springs)
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