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Data Structures and Algorithms Stack Queue

Practice Patterns Stack

Lesson 46/87

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Interactive DSA Laboratory

Practice Patterns Stack

A stack is a linear data structure that follows LIFO (Last-In-First-Out): items are added and removed from the top.

TopicStack Fundamentals

PatternLIFO Stack

TimeO(1) Core Operations

SpaceO(N) Total Storage

Current Step

Initialize Structure

Allocate a standard LIFO Stack buffer structure.

Playback Speed850ms

Timeline1 / 6

Custom Input Data

Structural Invariants

▪LIFO access pattern

▪Push/Pop happen at the top

▪Peek/top reads without removing

Invariants

⠿

A stack is a linear data structure that follows LIFO (Last-In-First-Out): items are added and removed from the top.

Variables

⠿

size0

Code Tracker

:::

1void push(int x) { st.push(x); }

2int pop() {

3 int x = st.top();

4 st.pop();

5 return x;

6}