In an adjacency list representation of an undirected simple graph \(G =…

In an adjacency list representation of an undirected simple graph $G = (V,E)$, each edge $(u, v)$ has two adjacency list entries: [$v$] in the adjacency list of $u$, and [$u$] in the adjacency list of $v$. These are called twins of each other. A twin pointer is a pointer from an adjacency list entry to its twin. If |$E$| = $m$ and |$V$| = $n$, and the memory size is not a constraint, what is the time complexity of the most efficient algorithm to set the twin pointer in each entry in each adjacency list?