Available question text
Given lists where each entry names a parent region followed by its immediate subregions and two region names, find their smallest common region — the lowest common ancestor in that region hierarchy. This is essentially an LCA-on-strings problem on a rooted tree defined by parent→children relationships.
Related questions
Continue with questions that share topics or the same question type.
- Smallest String With Swaps
Coding · Array · Breadth-First Search · Depth-First Search
- Accounts Merge
Coding · Array · Breadth-First Search · Depth-First Search
- Step-By-Step Directions From a Binary Tree Node to Another
Coding · Binary Lifting · Binary Tree · Depth-First Search
- Lowest Common Ancestor of a Binary Tree
Coding · Binary Lifting · Binary Tree · Depth-First Search
Sources · 2 references
These records explain where the question appears. A company tag or candidate report does not guarantee a future interview question.
Hello Interview · 1 record
Airbnb
Leetcode 1257. Smallest Common Region
Reported Apr 21, 2026 · 1 source report
SENIOR
Source snapshot: Nov 12, 2026
View source
LeetCode company tags · 1 record
Airbnb
Smallest Common Region
Reported date not specified · Source window: 6mo
Source snapshot: Oct 20, 2026
Source frequency score: 81.8. This is not an interview probability.
View source