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.
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Energy of a photon
Make a random, non-repeating vector.
Max index of 3D array
Integer sequence - 2 : Kolakoski sequence
Periodic Table II 101.
Celsius to Fahrenheit converter
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