DAILY43

Practice these 43 problems to build your foundation in Data Structures and Algorithms. If you are struggling with DSA or have no knowledge in problem solving, this is the best place to start. At the end, you will master core DSA concepts and will be able to solve any EASY-tagged problem within 15 minutes. No prerequisite needed.

DAILY43: Algorithmic Problems for Coding Interviews: Easy level, C++ edition. Get the book to follow along this repository with detailed explanation of related concepts and level up.

Problem #	Difficulty Level	Concepts	Time to solve (in minutes)
Problem 1	Easy	Hash Set, Binary Search, Two Pointer	15 min
Problem 2	Easy	Stack	20 min
Problem 3	Easy	Linked List, Bi-Traversal	20 min
Problem 4	Easy	Array, Dynamic Programming	15 min
Problem 5	Easy	String, Two Pointer approach	15 min
Problem 6	Easy	Binary Tree, Recursion	15 min
Problem 7	Easy	String, Frequency counting	15 min
Problem 8	Easy	Graph / Matrix, BFS / DFS	15 min
Problem 9	Easy	Graph, BFS / DFS	15 min
Problem 10	Easy	Binary Tree, Height, Recursion	15 min
Problem 11	Easy	Linked List, Fast Slow Pointer	15 min
Problem 12	Easy	Queue, Stack, Augmented Data Structure	20 min
Problem 13	Easy	Array, Search, Binary Search	15 min
Problem 14	Easy	Fibonacci sequence, Dynamic Programming, Binet Formula	15 min
Problem 15	Easy	String, Frequency counting	15 min
Problem 16	Easy	Linked List	15 min
Problem 17	Easy	Array, Frequency counting	20 min
Problem 18	Easy	String, Bitwise operations	20 min
Problem 19	Easy	Binary Tree, Height, Recursion	20 min
Problem 20	Easy	Binary Tree, Height, Recursion	20 min
Problem 21	Easy	Linked List, Fast Slow Pointer	20 min
Problem 22	Easy	Array, Frequency Counting, Hash Set	20 min
Problem 23	Easy	Array, Mapping / Hash Set	20 min
Problem 24	Easy	String, Stack, Two Pointer	20 min
Problem 25	Easy	Bitwise operation, Dynamic Programming	20 min
Problem 26	Easy	Binary Tree, Recursion	20 min
Problem 27	Easy	Bitwise operation	20 min
Problem 28	Easy	Array, Frequency counting, XOR	20 min
Problem 29	Easy	Array, Two Pointer Approach, Swap	20 min
Problem 30	Easy	Array, Sorting, XOR	20 min
Problem 31	Easy	Bitwise operation	20 min
Problem 32	Easy	Linked List, Slow Fast Pointer	20 min
Problem 33	Easy	Binary Tree, Recursion	20 min
Problem 34	Easy	Array, Sorting, Two Pointer Approach	20 min
Problem 35	Easy	Triangle, Mathematics	20 min
Problem 36	Easy	Array, Prefix Sum	20 min
Problem 37	Easy	Array, Greedy	20 min
Problem 38	Easy	Array, Sorting, Hash Set	20 min
Problem 39	Easy	Array, Frequency counting	20 min
Problem 40	Easy	String, Dynamic Programming, Two Pointer Approach	20 min
Problem 41	Easy	Game Theory, Dynamic Programming	20 min
Problem 42	Easy	Array, Dynamic Programming	20 min
Problem 43	Easy	String, Sliding Window	20 min