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.
Determine whether a vector is monotonically increasing
Triangle Numbers Below N
Getting the indices from a matrice
Set a diagonal
The almost-birthday problem.
Basic arrays operations.
Change the sign
Periodic Table 101.
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