Available question text
Determine whether a given permutation popped can be the result of push/pop operations on an initially empty stack when elements are pushed in the order of pushed. This is the classic stack-permutation check: simulate pushing from pushed and greedily pop whenever the stack top matches the next popped value to verify validity in O(n) time.
Related questions
Continue with questions that share topics or the same question type.
- Build an Array With Stack Operations
Coding
- Compute Exclusive Time from Stack Events
Coding
- Compute exclusive times and call stack from logs
Coding · Stacks & Queues
- Convert Stack Samples into Trace Events
Coding · Arrays & Strings · Simulation & State Machines · Stacks & Queues
Sources · 1 reference
These records explain where the question appears. A company tag or candidate report does not guarantee a future interview question.
Hello Interview · 1 record
No company association
Leetcode 946. Validate Stack Sequences
Reported date not specified · 0 source reports
Source snapshot: Nov 12, 2026
View source