DSA
DSA/Stack
Stack
Coming soonFrom balanced-parentheses to the monotonic-stack pattern that answers next-greater-element in a single pass.
12
Planned lessons
11
Coding problems
6h
Est. study time
Medium
Difficulty
Overview
The stack's LIFO discipline solves matching, parsing, and next-greater-element problems. The star of this course is the monotonic stack.
Why it matters
The monotonic stack answers next-greater / next-smaller queries in a single O(n) pass — an optimisation that feels like magic until you internalise it.
What the course will cover
- Balanced parentheses and expression evaluation
- Monotonic increasing / decreasing stacks
- Next greater element and daily temperatures
- Histogram and rectangle problems
- Patterns: Valid Parentheses, Largest Rectangle in Histogram
Interview relevance
When a problem involves nearest larger/smaller elements or nested structure, interviewers expect a stack — ideally a monotonic one.
Topics you'll master
StackMonotonic StackParsing
In the meantime, dive into a published track to keep your momentum.