Two stacks S1 and S2 are to be stored in a single array A[1:n], with PushS1 (x) and PushS2 (x) handling their respective push operations with regard to element x and PopS1 (x) and PopS2 (x) handling their respective pop operations, with the output variable x indicating the element popped out from the stack. Let TopS1 and TopS2 be their respective top-of-stack variables. The stacks share their storage space in such a way that their respective bottom of stacks are positioned in the middle of the array, as shown in Figure P4.1, and the stacks grow in the opposite directions. Array A: [1] [2] [3]... Stack S₁ ... [[n/2]][[n/2]+1] [n-2] [n-1] [n] Bottom of Stack S₁ PopS1 (w) PopS2 (y) PushS1 (y) PushS2 (w) Stack S₂ Figure P4.1. Two stacks are stored in a single array A with the bottom of stacks positioned in the middle of the array PopS2 (y) PopS2 (w) Bottom of Stack S₂ i) For n = 5, if S1 = {a, b} and S2 = {m, n}, how would array A look after all of the elements of stacks S1 and S2 were pushed into it invoking PushS1(x) and PushS2(x)? ii) How would array A look if the following operations were carried out in a sequence? What values do the variables w and y represent at the end of the operations?
Types of Linked List
A sequence of data elements connected through links is called a linked list (LL). The elements of a linked list are nodes containing data and a reference to the next node in the list. In a linked list, the elements are stored in a non-contiguous manner and the linear order in maintained by means of a pointer associated with each node in the list which is used to point to the subsequent node in the list.
Linked List
When a set of items is organized sequentially, it is termed as list. Linked list is a list whose order is given by links from one item to the next. It contains a link to the structure containing the next item so we can say that it is a completely different way to represent a list. In linked list, each structure of the list is known as node and it consists of two fields (one for containing the item and other one is for containing the next item address).
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