Given the symbol of an element, return its atomic number. This is the continuation of problem 1361.
Return a list sorted by number of occurrences
Rotate a Matrix by 90 degrees
Generate N equally spaced intervals between -L and L
The Answer to Life, the Universe, and Everything
Area of an equilateral triangle
Special Relativity 101.
Change the sign
Number of lattice points within a circle
Periodic Table 101.
Basic arrays operations.
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