Parsing and Formatting Text

Parsing and formatting problems give you rules that fill a paragraph and code that fits on one screen. Simulation and parsing is the problem type HRT comes back to most often, and the comment-length counter in The Online Assessment is one example. The five problems here push the same skill further.

Two are warm-ups that take away the usual shortcut, so you write by hand what a library call would normally do. The other three give you a small grammar or rule set and ask you to follow it. None of them needs a clever algorithm. The points go to the small rules, like a range boundary or the smallest 32-bit integer.

Before you submit, type each worked example in as a test of your own. On the online assessment you see only a few cases, and a small misread can pass every one of them and still fail the hidden tests.

Hudson River TradingPremium lesson · Coding round

The 5 Hudson River Trading problems are below.

1. 1A Premium questionCoding · Easy · Frequently asked
2. 2A Premium questionCoding · Hard
3. 3A Premium questionCoding · Easy

+ 2 more in this lesson

Each with hints, the follow-up and a tested solution.

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