Stack Machines and Parsers
A small stack machine is one of Jump's longest-running online test problems, first on Codility and then on the tools that replaced it. It looks like a warm-up. Then the hidden tests feed it bad input, and every one of those cases has to be caught.
The other problems here need the same habit. You make one pass over the input and check for every bad case along the way. They come from live rounds and C++ tests, and the newest one parses a small spec and lists everything it allows.
Before you write the loop, list the bad inputs you can think of and give each one a test of its own. Some formats change between versions of the task, so ask for the exact format on the day.
Jump TradingPremium lesson · Coding round
The 4 Jump Trading problems are below.
- A Premium questionCoding · Easy · Signature problem
- A Premium questionCoding · Medium
- A Premium questionCoding · Medium
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Each with hints, the follow-up and a tested solution.
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