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Reverse Integer
Reverse Integer is one of those problems where a small math insight beats brute force. Interviewers love it because it reveals your turning constraints into math and your edge-case discipline. The trap is brute force: there's almost always a simplification hiding in the constraints.
Learn this pattern
Math & Geometry Problems
Interview math problems test a small set of number-theory tricks: modular arithmetic, GCD/LCM, fast exponentiation, and sieve of Eratosthenes. Recognizing which trick applies is the hard part -- the implementation is short.
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Talk through the problem while you code. Signed-in reps become prep memory for the next session.
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Math & Geometry Problems gives you a useful next rep while you are still on your phone.