Notion Coding Interview Questions
25 Notion coding interview problems with full optimal solutions — 14 easy, 10 medium, 1 hard. Every problem ships with multiple approaches (brute-force first, then the optimal), complexity tables for each, company-specific tips on what an Notion interviewer values, and a FAQ section.
Showing 8 problems of 25
- #4easysometimes asked
4. Merge Two Sorted Lists
Merge two sorted singly-linked lists into one. Notion uses this to check whether you can write clean pointer code — relevant to merging two CRDT operation logs.
- #6easysometimes asked
6. Invert Binary Tree
Swap left and right children of every node in a binary tree. Notion uses this as a one-minute tree-traversal opener.
- #7easysometimes asked
7. Same Tree
Determine whether two binary trees are structurally and value-wise identical. Notion uses this to introduce the dual-recursion pattern needed for CRDT operation comparison.
- #8easysometimes asked
8. Symmetric Tree
Determine whether a binary tree is a mirror of itself. Notion likes this for the dual-pointer recursion that introduces tree-symmetry thinking.
- #9easysometimes asked
9. Balanced Binary Tree
Determine whether a binary tree is height-balanced (heights of children differ by at most 1). Notion uses this to test the single-pass DFS trick that avoids O(n^2) recomputation.
- #10easysometimes asked
10. Path Sum
Determine whether a root-to-leaf path sums to a target. Notion uses this as a base case before extending to tree-aggregate problems.
- #11easysometimes asked
11. Pascal's Triangle
Generate the first numRows of Pascal's triangle. Notion uses this as a row-building warmup before harder DP grid problems.
- #13easysometimes asked
13. Valid Palindrome
Determine whether a string is a palindrome after stripping non-alphanumerics and lowercasing. Notion uses this as a two-pointer warmup.
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