Categories

Arrays & Strings

Master array manipulation and string algorithms

Data Structures

Linked Lists

Learn linked list operations and patterns

Trees & Graphs

Explore tree traversals and graph algorithms

Dynamic Programming

Solve optimization problems with DP

Sorting & Searching

Efficient sorting and searching techniques

Stack & Queue

LIFO and FIFO data structure problems

Hash Tables

Efficient lookups and counting problems

Recursion & Backtracking

Recursive solutions and backtracking patterns

Greedy Algorithms

Locally optimal choices for global solutions

Mathematical Problems

Number theory and mathematical algorithms

Bit Manipulation

Binary operations and bit tricks

Heap & Priority Queue

Heap data structure and priority queues

Trie

Prefix trees and string matching

Union Find

Disjoint set data structure

Segment Tree

Range queries and updates

Binary Indexed Tree

Fenwick tree for prefix operations

Matrix

2D array problems and transformations

Intervals

Interval scheduling and merging

Design & OOP

System design and object-oriented problems

Simulation

Process simulation problems

Number Theory

Prime numbers, GCD, modular arithmetic

Geometry

Computational geometry problems

Combinatorics

Permutations, combinations, counting

Game Theory

Minimax and optimal play strategies