Implement a FIFO queue using only two stacks. Support push, pop, peek, and empty.
MyQueue → push(1) → push(2) → peek()→1 → pop()→1 → empty()→false
Unlock hints progressively — start gentle, go deeper only if needed.
Level 1: Gentle Nudge
A subtle direction
Level 2: Approach
The algorithm to use
Level 3: Detailed
Step-by-step guidance
to save progress and use AI features