why we use *l in class we can also make a list and then in constructor we define it’s size
Adjacent list implimentation
Hey @Pranav7g
You can make a list direct without dynamic allocation of fixed size say 10^5
But to optimize space we allocate it dynamically in constructor with the size of number of nodes.
If this resolves your query then please mark it as resolved 
If we don’t give the size means we only initialize the list like: listl and when we make constructor the we efine the size
u have to use resize or something to define size in constructor then