Question: Assume there is a stock classs and a stocknode class and DBdlink stores stocks in a doubly linked list which has first,last and current members.

Assume there is a stock classs and a stocknode class and DBdlink stores stocks in a doubly linked list which has first,last and current members.

Write a hasloop member function for DBdlink to check if it has a loop

bool DBdlink::hasloop()

{

} hint:fast and slow, similar to find_middle

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