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Q. Reverse the order of the elements on a stack S
(i) by using two additional stacks
(ii) by using one additional queue.
Ans: Let S be the stack having n number of elements. Now we need to reverse the elements of S (i) using the two additional stack S1 and S2
while not empty (S)
{ C=pop(S);
push(S1,C);
}
While not empty(S1)
{ C=pop(S1);
push(S2,C);
While not empty(S3)
{ C=pop(S3);
push(S,C);
(ii) using one additional queue Q
enque(Q,C);
While not empty(Q)
{ C=deque(Q);
* Initialise d & pi* for each vertex v within V( g ) g.d[v] := infinity g.pi[v] := nil g.d[s] := 0; * Set S to empty * S := { 0 } Q := V(g) * While (V-S)
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