Solution: Compilation Order

Explore the topological sort pattern to solve class compilation order problems. This lesson teaches you how to build a graph from dependencies, identify sources, and produce a valid compilation sequence while handling cycles. Understand how to apply BFS for topological ordering, optimize time and space complexity, and implement the solution effectively in C++.

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Statement
Solution
- Naive approach
- Optimized approach using topological sort

Statement

There are a total of $n$ classes labeled with the English alphabet ( $A$ , $B$ , $C$ , and so on). Some classes are dependent on other classes for compilation. For example, if class $B$ extends class $A$ , then $B$ has a dependency on $A$ . Therefore, $A$ must be compiled before $B$ .

Given a list of the dependency pairs, find the order in which the classes should be compiled.

Constraints:

Class name should be a character.
$0 \leq$ dependencies.length $\leq 676$
dependencies[i].length $= 2$

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