Return the first and last characters of a character array
Reindex a vector
Calculate the height of an object dropped from the sky
Is it an Armstrong number?
Divisible by 7
Convert a temperature reading from Celsius to an unknown scale
Count the number of folds needed to pack a large sheet
Place wastewater treatment processes in the correct order
Design a minimum-cost cable network for a power grid
Find an optimal placement of coolers on a grid
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