Messaged a recruiter over LinkedIn and was sent a HackerRank coding challenge.

After passing that, a 30-minute chat with a recruiter was scheduled. Questions were asked in-depth about projects, work experience, and career goals.

Then, a 45-minute technical phone interview was scheduled. I got rejected after this round; however, the final round would have been on-site.

Balanced Chemical Reactions

For a chemical reaction represented by a string, verify that the chemical reaction is a balanced reaction (i.e., that we didn't somehow lose or gain an atom during the reaction). If the reaction is balanced, return true; otherwise, return false.

For example, for the hydrogen combustion reaction:

'2 H2 + O2 -> 2 H2O'

would output true because the number of atoms in the reactants match up with the number of atoms in the product.

However, for the precipitation of silver-chloride:

'NaCl + AgNO3 -> NaNO3 + Ag'

the output should be false because we're missing the chlorine atom in the products.

The reactants and products will always be separated by a right-pointing arrow "->", and the individual molecules within the reactants/products are always separated by a "+" sign. Multiple molecules are represented by a number and space prefacing the molecule (e.g., "2 H2O").