DSA · Theory

Heap memory vs. stack memory

Theory

451/810

Heap memory vs. stack memory

Heap memory vs. stack memory is a DSA topic. In plain words you use it for undo typing in a tiny editor. Don’t start with a slogan — start with that picture.

Smallest example: push / pop LIFO. Type it, run it, and say what you see. If you can do that from memory, you know Heap memory vs. stack memory.

From the example next to this theory — Heap memory vs.

Trap — pop on empty. Fix that before you talk about advanced DSA.

Viva — what is Heap memory vs. stack memory? Then show push / pop LIFO. Then name the trap.

Diagram

    | 3 |  ← top (pop)
    | 2 |
    | 1 |
    LIFO

Exam tip

What is Heap memory vs. stack memory? Show this: push / pop LIFO. Trap: pop on empty.

Example

import heapq

def heap_sort(arr):
    h = arr[:]
    heapq.heapify(h)
    return [heapq.heappop(h) for _ in range(len(h))]

print(heap_sort([5, 1, 4, 2]))

Heap memory vs. stack memory — heap sort uses a binary heap to repeatedly extract the minimum.

Short notes

DefHeap memory vs. stack memory — undo typing in a tiny editor.
Rulepush / pop LIFO
Trappop on empty
Usea tiny editor

DSA · Theory

Heap memory vs. stack memory

← All stacks

Theory

451/810

Heap memory vs. stack memory

Heap memory vs. stack memory is a DSA topic. In plain words you use it for undo typing in a tiny editor. Don’t start with a slogan — start with that picture.

Smallest example: push / pop LIFO. Type it, run it, and say what you see. If you can do that from memory, you know Heap memory vs. stack memory.

From the example next to this theory — Heap memory vs.

Trap — pop on empty. Fix that before you talk about advanced DSA.

Viva — what is Heap memory vs. stack memory? Then show push / pop LIFO. Then name the trap.

Diagram

    | 3 |  ← top (pop)
    | 2 |
    | 1 |
    LIFO

Exam tip

What is Heap memory vs. stack memory? Show this: push / pop LIFO. Trap: pop on empty.

Example

import heapq

def heap_sort(arr):
    h = arr[:]
    heapq.heapify(h)
    return [heapq.heappop(h) for _ in range(len(h))]

print(heap_sort([5, 1, 4, 2]))

Heap memory vs. stack memory — heap sort uses a binary heap to repeatedly extract the minimum.

Short notes

DefHeap memory vs. stack memory — undo typing in a tiny editor.
Rulepush / pop LIFO
Trappop on empty
Usea tiny editor

Heap memory vs. stack memory

Example

Short notes

Questions

Heap memory vs. stack memory

Example

Short notes

Questions