Solution: Find a Mother Vertex in a Directed Graph

Statement

Given a directed graph as input, determine a mother vertex within it. A mother vertex in a graph $G = (V, E)$, is vertex $V$ such that all other vertices in $G$ can be reached by a path from $V$. Although a graph might feature multiple mother vertices, your goal is to identify at least one.

Constraints:

• $0\le$ ...