Counting Node Pairs Requiring Two Hubs in a Connected Graph
Given a connected undirected graph with $n$ nodes and $m$ edges, and two distinct nodes $a$ and $b$, count unordered pairs $(u, v)$ where $u < v$ such that: $u \neq a$, $u \neq b$, $v \neq a$, $v \neq b$ Every path from $u$ to $v$ passes through both $a$ and $b$ Approach The solution involves ide...