Similar Triangles - find the height of the tree
Back to basics 11 - Max Integer
Back to basics 19 - character types
Magic is simple (for beginners)
Generate a random matrix A of (1,-1)
How to subtract?
Given a square and a circle, please decide whether the square covers more area.
Given n, create n random numbers such that their standard deviation is also n.
Basic electricity in a dry situation
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