Make a checkerboard matrix
First non-zero element in each column
Back to basics 9 - Indexed References
Add two numbers
Sum of the Matrix Elements
Trace the path of a harmful chemical in an ecological network
Convert a temperature reading from Celsius to an unknown scale
Design a minimum-cost cable network for a power grid
Design a tubesheet for shell-and-tube heat exchangers
Count the number of reaction chains achievable in T mins
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