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Molecule to atoms

molecules-

Here is a interested algorithm question on codewars site. For a given chemical formula represented by a string, count the number of atoms of each element contained in the molecule and return an object. For example: water = ‘H2O’ parse_molecule(water)

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Performance on sum of many ints by Python

sum

There is a such question  at codewars(http://www.codewars.com) site. Write a function to do calculation according below formula: for i from 1 to n, do i % m and return this sum for example: f(n=10,m=5) //return 20 (1+2+3+5+0+1+2+3+4+0) actually it is

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