american-express Coding Problems

All C# Programs — Data Structures 167 DSA — Dynamic Programming 105 DSA — Binary Search 105 DSA — Trees 105 DSA — Hashing 105 C# Programs — Strings 105 DSA — Strings 105 DSA — Two Pointers 105 DSA — Sorting 105 C# Programs — Arrays 105 DSA — Graphs 105 DSA — Arrays 105 DSA — Stacks & Queues 105 C# Programs — LINQ 104 C# Programs — Sorting 103 C# Programs — OOP 103 C# Programs — Collections 103 SQL Server — Subqueries 101 C# Programs — Inheritance 101 SQL Server — CTEs 101 SQL Server — JOINs 101 SQL Server — DDL & constraints 101 C# Programs — Interfaces 101 SQL Server — WHERE & filtering 101 SQL Server — T-SQL procedures 101 SQL Server — Aggregates & GROUP BY 101 SQL Server — SELECT basics 101 SQL Server — Window functions 101

30 problems in this topic

#	Title	Topics	Acceptance	Pts	Difficulty
1	Group Anagrams American Express	American Express company-dsa finance	—	30	Medium	Solve
2	Two Sum II - Input Array Is Sorted American Express	American Express company-dsa finance	—	30	Medium	Solve
3	Permutation in String American Express	American Express company-dsa finance	—	30	Medium	Solve
4	Daily Temperatures American Express	American Express company-dsa finance	—	30	Medium	Solve
5	Search in Rotated Sorted Array American Express	American Express company-dsa finance	—	30	Medium	Solve
6	Copy List with Random Pointer American Express	American Express company-dsa finance	—	30	Medium	Solve
7	Invert Binary Tree American Express	American Express company-dsa finance	—	20	Easy	Solve
8	Binary Tree Level Order Traversal American Express	American Express company-dsa finance	—	30	Medium	Solve
9	Serialize and Deserialize Binary Tree American Express	American Express company-dsa finance	—	40	Hard	Solve
10	Kth Largest Element in an Array American Express	American Express company-dsa finance	—	30	Medium	Solve
11	Subsets II American Express	American Express company-dsa finance	—	30	Medium	Solve
12	Clone Graph American Express	American Express company-dsa finance	—	30	Medium	Solve
13	Course Schedule II American Express	American Express company-dsa finance	—	30	Medium	Solve
14	Network Delay Time American Express	American Express company-dsa finance	—	30	Medium	Solve
15	House Robber II American Express	American Express company-dsa finance	—	30	Medium	Solve
16	Longest Increasing Subsequence American Express	American Express company-dsa finance	—	30	Medium	Solve
17	Interleaving String American Express	American Express company-dsa finance	—	30	Medium	Solve
18	Jump Game American Express	American Express company-dsa finance	—	30	Medium	Solve
19	Insert Interval American Express	American Express company-dsa finance	—	30	Medium	Solve
20	Spiral Matrix American Express	American Express company-dsa finance	—	30	Medium	Solve
21	Single Number American Express	American Express company-dsa finance	—	20	Easy	Solve
22	Contains Duplicate American Express	American Express company-dsa finance	—	20	Easy	Solve
23	Encode and Decode Strings American Express	American Express company-dsa finance	—	30	Medium	Solve
24	Best Time to Buy and Sell Stock American Express	American Express company-dsa finance	—	20	Easy	Solve
25	Min Stack American Express	American Express company-dsa finance	—	30	Medium	Solve
26	Search a 2D Matrix American Express	American Express company-dsa finance	—	30	Medium	Solve
27	Merge Two Sorted Lists American Express	American Express company-dsa finance	—	20	Easy	Solve
28	LRU Cache American Express	American Express company-dsa finance	—	30	Medium	Solve
29	Same Tree American Express	American Express company-dsa finance	—	20	Easy	Solve
30	Kth Smallest Element in a BST American Express	American Express company-dsa finance	—	30	Medium	Solve

Problem of the day

Graph Valid Tree

Medium · +15 pts

Solve today

Weekly leaderboard

View all

Be the first to climb the board this week.

Company sheets

Toolliyo unique — practice by hiring company.

Google Amazon Microsoft Meta Apple Netflix TikTok LinkedIn Nvidia Uber

Browse all companies

Interview path

DSA Interview 150 All roadmaps 3,700+ Interview Q&A

Problems explorer