CodingMediumcod-g103

Subject StacksLevel Mid–Senior~20 minCommon in Algorithms & data structures interviewsIndustries Software development

Question

Given two integer sequences pushed and popped, each a permutation of distinct values with no repeats, determine whether popped could be the result of a sequence of push and pop operations on an initially empty stack, where the values are pushed strictly in the order given by pushed. Return True or False. Both sequences have the same length, 0 to 1000.

Implement

validate_stack_sequences(pushed: list[int], popped: list[int]) → bool

Examples

in[[1,2,3,4,5],[4,5,3,2,1]]outtrue

What a strong answer looks like

State your approach and its time/space complexity out loud before you optimize. Handle the edge cases (empty input, duplicates, overflow), and say why you chose this over the brute force. Green tests are the floor, not the grade.

Learn the concepts

Vibe coding: describe the solution in plain language (or narrate it) and the coach grades your approach. Generating runnable code from your description is coming next.

Run or narrate your approach, then ask the coach.