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.
Which doors are open?
Find the sum of the elements in the "second" diagonal
Who knows the last digit of pi?
Change the sign
The almost-birthday problem.
Basic arrays operations.
Periodic Table II 101.
Celsius to Kelvin
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