Programming coding problems

Master programming fundamentals, data structures, algorithms, and problem-solving skills. From basic loops to advanced dynamic programming.

Programming coding problems
#	Problem	Difficulty	Topic
1	Two Sum Target Lookup	Easy	Arrays & Hashing
2	Reverse String In-Place	Easy	Strings & Two Pointers
3	Validate Binary Search Tree	Medium	Trees
4	Coin Change	Medium	Dynamic Programming
5	Longest Increasing Subsequence	Medium	Dynamic Programming
6	Container With Most Water	Medium	Two Pointers
7	Reverse Linked List	Easy	Linked Lists
8	Linked List Cycle Entry	Medium	Linked Lists
9	Lowest Common Ancestor of a Binary Tree	Medium	Trees
10	Evaluate Boolean Binary Tree	Easy	Trees
11	LRU Cache	Medium	Design
12	Design a Sliding Window Rate Limiter	Medium	Design
13	Design a URL Shortener	Medium	Design
14	Diffie-Hellman Key Agreement	Medium	Cryptography
15	Network Packet Filter Simulation	Medium	Network Security
16	Combine Two Tables	Easy	SQL
17	Consecutive Numbers	Medium	SQL
18	Print in Order	Easy	Thread Synchronization
19	Print FooBar Alternately	Medium	Thread Synchronization
20	Add Two Numbers	Medium	Linked Lists & Math
21	Median of Two Sorted Arrays	Hard	Binary Search & Divide and Conquer
22	Trapping Rain Water II	Hard	Heap & Breadth-First Search
23	Word Ladder II	Hard	Graph, BFS & Backtracking
24	Alien Dictionary	Hard	Graph & Topological Sort
25	Burst Balloons	Hard	Dynamic Programming & Divide and Conquer
26	Shortest Path Visiting All Nodes	Hard	Bit Manipulation & Graph Search