A medium Python interview practice problem on DataDriven. Write and execute real python code with instant grading.

Domain

Python

Difficulty

medium

Seniority

L4

Problem

Implement a FIFO queue class using two stacks. Support push(x), pop() (return popped value), peek() (return front), empty() (return bool). Test harness passes ops and returns their outputs parallel: None for push, the value for pop/peek, True/False for empty.

Summary

A queue in sheep's clothing.

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