What are Complexity Classes? (P, NP, NP-Hard, NP-Complete) | 1st Year Computer Science

Lecture 08: Complexity Classes (P, NP, NP-Hard, NP-Complete) - 1st Year Computer Science Chapter 03: Algorithms and Problem Solving In this lecture, we will learn about one of the most important concepts in computer science: Complexity Classes. After understanding solvable vs. unsolvable problems, the next step is: how efficiently can we solve them? To answer this, computer scientists use Complexity Classes. You will learn in this lecture: What is Class P? (Efficiently solvable problems like Sorting) What is Class NP? (Easy to check, hard to solve problems like Sudoku) What are NP-Hard problems? (Examples: Traveling Salesman Problem) What are NP-Complete problems? (Examples: Knapsack Problem) The famous P vs NP Question explained in easy words Taught by: Sir Muhammad Iqbal Subject: 1st Year Computer Science – Punjab Board 2025 Book: New Syllabus – Chapter 3 (Algorithms and Problem Solving) Don’t forget to: Like the video Ask your questions in comments Share with your classmates Next up: Lecture 09 – Problem Analysis #1stYearComputerScience #ComplexityClasses #PandNP #NPComplete #NPHard #AlgorithmsAndProblemSolving #PunjabBoard2025 #CSwithSirIqbal