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Grokking the Coding Interview Patterns in C++

Solution: Parallel Courses

Explore how to solve the Parallel Courses problem by applying topological sorting and depth-first search. This lesson teaches you to model course dependencies as a directed graph, detect circular prerequisites, and compute the minimum number of semesters required to complete all courses efficiently using memoization.

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Statement

You are designing a course schedule for a university with n courses, labeled from 1 to n. The prerequisite requirements are given in an array, relations, where each relations[i]=[prevCoursei,nextCoursei]\text{relations}[i] = [\text{prevCourse}_i, \text{nextCourse}_i] means that prevCoursei\text{prevCourse}_i must be completed before you can enroll in nextCoursei\text{nextCourse}_i ...