鏈結串列的抽象資料結構 以下是鏈結串列的抽象資料結構 (ADT): L is a list sub IsEmpty(L): bool sub PeekFront(L): result sub PeekRear(L): result sub At(L, index): result, 0 <= index < size sub SetAt(L, index, value): bool, 0 <= index < size sub Unshift(L, value): bool sub Push(L, value):