Kit Library / Computer Science / Data Structures
Quick KitShared by a Veda learner · Generated with Veda AI
Veda Bites are swipeable micro-lessons — each one teaches exactly one idea. Here's a taste from this kit; the app has the full deck.
Last in, first out!
A stack is a linear data structure that follows the LIFO (Last In, First Out) principle. The last element added is the first one removed. Think of a stack of plates: you add and remove from the top only.
↳ A stack is LIFO: the most recent addition is the first to be removed.
Four essential operations.
The primary operations are push (insert), pop (delete), peek (top element), and isEmpty (check if empty). Some implementations also include isFull for fixed-size arrays.
↳ Push, pop, peek, and isEmpty are the fundamental stack operations.
Plates in a cafeteria.
Imagine a spring-loaded stack of plates in a cafeteria. You always take the top plate (pop) and add new plates on top (push). You never access plates from the bottom or middle directly.
↳ The plate stack is a perfect real-world model of LIFO behavior.
A stack is a LIFO data structure with push, pop, peek, and isEmpty operations. Array implementation uses a fixed-size array and a top index, offering O(1) operations but requiring overflow/underflow checks. Stacks are fu...
~8 min · full explanation, examples & memory tricks in the app
22 questions laddered from warm-up to topper-level, each with an explanation. A taste:
What is the fundamental principle followed by a stack data structure?
BeginnerLast In, First Out (LIFO)
A stack follows LIFO: the last element pushed is the first to be popped.
In an array-based stack, which end is used as the top of the stack?
BeginnerThe last used index (top)
The top pointer indicates the index of the most recently added element; push/pop operate at that end.
What does the 'top' variable in an array-based stack represent?
BeginnerThe index of the last element pushed
The top variable stores the index of the most recent element; it is updated on push/pop.
What is the time complexity of the push operation in an array-based stack (without resizing)?
BeginnerO(1)
Push only updates the top index and places the element, so it takes constant time.
18 flashcards in this kit — the app reviews them with spaced repetition so the right card returns on the right day.
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