Edge Cases Interview Questions

Reverse the portion of an array lying between two given positions, and survive every bad argument the caller might pass. This Meta question is explicitly about the guards: positions out of order, positions outside the array, and a missing array altogether are all named in the statement. You will swap inward from both ends, decide whether to clamp or reject invalid positions, and leave the rest of the array untouched. A subscription unlocks the full problem and the reference solution.

A classic string validation challenge frequently presented by Meta, this interview problem requires you to parse a text sequence to determine if it represents a legally formatted numeric value according to strict grammar rules. Because standard parsing shortcuts are explicitly forbidden, you must carefully construct a robust state machine or parsing logic to handle signs, decimals, exponents, and tricky edge cases. View the detailed parsing logic, corner cases, and production-ready solution by obtaining a subscription.

A coding question on pricing an evening of child care when the hourly rate changes with the time of day. It tests careful handling of awkward inputs: shifts that cross midnight, schedules that wrap around the clock, overlapping or incomplete rate bands, and invalid times that must be rejected rather than priced.

A coding question on arrays: find the largest sum of any contiguous stretch of an integer list. It tests inputs that trip up quick answers, such as lists made only of negative values, a single element, zeros, very large numbers and an empty list, and how each case should be reported.

This coding challenge, featured in interviews at Hudson River Trading, tests your ability to convert a numerical value into its textual base representation without relying on standard library functions. Candidates must carefully handle edge cases, negative signs, and extreme lower bounds typical of 32-bit integer limits. It thoroughly examines your low-level manipulation skills and logical precision. Access to the full problem statement and expert model solution requires a paid subscription.