I tinkered with HackerRank just for the coding exercises, and was initially impressed by the sheer volume of languages the site supports, but quickly grew frust

I tinkered with HackerRank just for the coding exercises, and was initially impressed by the sheer volume of languages the site supports, but quickly grew frustrated with it. The use of stdio instead of a test suite like Codewars uses made writing in any languages for which they lacked I/O boilerplate tedious, and the layout was atrociously oversized, not even fitting completely in a 1000px-wide browser window.