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.
Distance walked 1D
vectorization in N
N-Dimensional Array Slice
Given area find sides
Dots in a Circle
Number of vertices of a hypercube
The almost-birthday problem.
Fahrenheit to Celsius converter
Periodic Table II 101.
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