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Grokking the Coding Interview Patterns

Parallel Courses

Understand how to apply topological sort to efficiently schedule parallel courses with prerequisites. Learn to identify circular dependencies and calculate the minimum number of semesters required for completion. This lesson builds your ability to solve dependency-based problems common in coding interviews.

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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 ...