Chris problems are kinda my favourite :)
Very nice problem
Similar Triangles - find the height of the tree
Make a run-length companion vector
Oh Zero Zero Zero!!!
Find nth maximum
Let's get back to school, and create multiplication tables
Find terms in the Connell sequence
Identify Ruth-Aaron numbers
Solve an ODE: equidimensional equation
Play Outside In with primes
Determine whether a square can be drawn on a grid of dots
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