American Express vs TikTok Interview Questions
American Express lists 23 LeetCode interview questions while TikTok lists 351. They share 7 problems — 30% of American Express's bank and 2% of TikTok's. Focus on the overlap first, then drill into 16 American Express-only and 344 TikTok-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 7 overlapping problems first. These are the highest-yield questions for candidates interviewing at both American Express and TikTok.
Step 2 — Company-specific depth: Add American Express-specific problems like Minimum Deletions to Make Character Frequencies Unique, Maximum Equal Frequency, Divide an Array Into Subarrays With Minimum Cost II and TikTok-specific problems from the exclusive lists below.
Step 3 — Difficulty tuning: TikTok skews harder in our data. Budget extra time for Hard problems if you are targeting that company.
Difficulty Comparison
Top Shared Topics
7 Shared Questions
High-priority problems to practice for both American Express and TikTok.
| Problem | Difficulty |
|---|---|
| Two Sum | Easy |
| Longest Substring Without Repeating Characters | Medium |
| Best Time to Buy and Sell Stock | Easy |
| 3Sum | Medium |
| Rotate Array | Medium |
| Permutations | Medium |
| Longest Common Prefix | Easy |
Unique to American Express (16)
Problems in American Express's list that do not appear at TikTok.
Unique to TikTok (344)
Problems in TikTok's list that do not appear at American Express.
| Problem | Difficulty |
|---|---|
| LRU Cache | Medium |
| Number of Islands | Medium |
| Longest Increasing Subsequence | Medium |
| Number of Distinct Islands | Medium |
| Meeting Rooms II | Medium |
| Course Schedule II | Medium |
| Merge Intervals | Medium |
| Course Schedule | Medium |
| Trapping Rain Water | Hard |
| Subarray With Elements Greater Than Varying Threshold | Hard |
| Text Justification | Hard |
| Decode String | Medium |
Frequently Asked Questions
How many LeetCode questions do American Express and TikTok share?
American Express and TikTok share 7 LeetCode interview questions. 16 problems appear only in American Express's list and 344 appear only in TikTok's list.
What topics overlap most between American Express and TikTok?
The most common shared topics between American Express and TikTok are Array (6 shared questions), Hash Table (2 shared questions), String (2 shared questions), Two Pointers (2 shared questions), Sliding Window (1 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: American Express or TikTok?
American Express has 8 Easy, 12 Medium, and 3 Hard questions. TikTok has 34 Easy, 245 Medium, and 72 Hard questions. TikTok has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both American Express and TikTok?
Start with the 7 shared problems since they cover what both companies ask most often. Then add 16 American Express-specific and 20 TikTok-specific questions to round out your prep.