Find the number of points (x,y) in square lattice with x^2 + y^2 =< n. This is related to Jame's Problem 1387. Here you have to find the number of points within a circle.
Sort a list of complex numbers based on far they are from the origin.
Find matching parenthesis
Sum all integers from 1 to 2^n
Is the Point in a Circle?
Reindex a vector
Number of vertices of a hypercube
Celsius to Kelvin
The almost-birthday problem.
Special Relativity 101.
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