Tree Travarsal

Tree

Recursion

Template

Two pointers - Template 1

Array

Two Pointers

Template

Two pointers - Template 2

Array

Two Pointers

Template

Prefix Sum

Array

Template

Efficient string building

Array

String

Template

Find number of subarrays that fit an exact criteria

Array

Template

Monotonic increasing stack

Array

Stack

Template

Binary search: duplicate elements, left-most insertion point

Search

Template

Binary search: duplicate elements, right-most insertion point

Search

Template

Binary search: for greedy problems

Search

Template

Backtracking

Search

Template

Sliding Window

Array

Two Pointers

Template