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I think your problem is the pointer reference "temp = headFinal", since you are using C++, once you change temp->next, it actually changes headFinal->next as well. As you can imagine, at the end of the while loop, your headFinal only points to end elements.
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I think your problem is the pointer reference "temp = headFinal", since you are using C++, once you change temp->next, it actually changes headFinal->next as well. As you can imagine, at the end of the while loop, your headFinal only points to end elements.