資料結構

The adjacency-matrix representation of a graph $G=(V, E)$ assumes that the vertices are numbered $1, 2, \ldots, |V|$. Then the adjacency-matrix representation of a graph $G$ consists of a $|V| \times |V|$ matrix $A = (a_{ij})$ such that

$a_{ij} = \begin{cases} 1 & \text{if } (i,j) \in E \\ 0 & \text{otherwise.} \end{cases}$

Let V = {1,2,3,4,5} and its adjacency matrix be

Which of the following descriptions is WRONG or the least accurate?