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.
Arrange Vector in descending order
Set some matrix elements to zero
Permute diagonal and antidiagonal
Given a 4x4 matrix, swap the two middle columns
Periodic Table II 101.
Celsius to Kelvin
Fahrenheit to Celsius converter
Celsius to Fahrenheit converter
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