How are second and third option correct in this mcq

#1

Which of the following can be used to store a simple undirected graph with N nodes?

vector < int > graph [ N + 1 ]

bool graph [ N + 1 ][ N + 1 ]

vector < vector < int > > graph(N+1)

All of them.

#2

hello @S19APPN0069
bool graph[N+1][N+1] -> this is adjacency matrix , u can mark graph[i][j]=true if there exist edge between vertex i and vertex j otherwise false.

vector < vector < int > > graph(N+1)-> this is same as first one, only difference is that here we are using vector in place of array.

#3

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