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I'm forcing myself to write my own programming language and then solve leetcode with it to stand a chance in today's interview rodeo. If you're interested: https://github.com/glouw/rr/tree/master/examples/leetcode

That sounds like a terrible idea?

interviewer: we're going to do a small coding exercise. you can use ANY programming language you would like. ANY PROGRAMMING LANGUAGE!

"The standard library has a built-in function to invert a binary tree in optimal time..."

That's...intense.