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.
Finding Perfect Squares
surface of a spherical planet
All your base are belong to us
CONVERT TAN TO SIN
The almost-birthday problem.
Fahrenheit to Celsius converter
Change the sign
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