By John Mongan
Programming Interviews uncovered. second variation. The strain is on through the interview technique yet with the best practise, you could stroll away together with your dream task. This vintage publication uncovers what interviews are fairly like at America's most sensible gentle
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Now try looking for a solution without an extra data structure. It seems you have exhausted all the possibilities for going backward through the list, so try an algorithm that traverses the list from the start to the end. You still can’t immediately determine whether a node is a child. One advantage of going forward, however, is that you can find all the child nodes in the same order that you appended them to the first level. You would also know that every child began a child list in the original list.
When will you need to update these pointers? Obviously, operations in the middle of a long list will not affect either the head or tail. You need to update the pointers only when you change the list such that a different element appears at the beginning or end. More specifically, when you insert a new element at either end of the list, that element becomes the new beginning or end of the list. When you delete an element at the beginning or end of the list, the next-to-first or next-to-last element becomes the new first or last element.
It should indicate that the operation was unsuccessful, but it still has to be able to return data when it is successful. A C function has a single return value, but pop really needs to return two values: the data it popped and an error code. There are a number of possible solutions to this problem, none of which are entirely satisfactory. One approach is to use the single return value for both purposes. If pop is successful, have it return the data; if it is unsuccessful, return NULL. As long as your data is a pointer type and you never need to store null pointers on the stack, this works fine.