Doubly-linked list insert my opinion a bit difficult to understand, especially those pointers, p-> next, p-> next-> prior, as well as s-> next these
There precursor doubly linked list node, the node flooding
Understood that the p-> next, p-> next-> prior, and s-> next such that insertion of the doubly-linked list like to understand
With the above understanding, then it is deleted Ye Hao understand
