List of Recursion Programming Problems

- ALL FRACTALS (Sierpinski Triangle/Square, Koch Snowflake, Trees, Ferns, Hilbert Curve, etc.)
- fibonacci
- factorial
- GCD
- collatz sequence
- towers of hanoi
- eight queens problem
- hadamard matrix
- flood fill
- palindrome detection
- binary search
- reversing a string/linked list
- sum/multiply the numbers in a list
- sum the digits of a number
- binary tree traversal
- maze backtracking
- permutations
- combinations
- all subsets of a set
- quick sort
- merge sort
- boggle
- adding a child to a binary tree
- validating a binary tree
- making change with coins of various denominations
- find out if two nodes are connected in a graph
- editing distance/levenshtein distance
- knapsack problem (where items have value and size/weight)
- word ladders (least > last > lost > cost > coast > cast > cask > mask > mast > most)
- file system directory traversal
- number of paths through an N x N grid
- how many ways to go up N steps if you can go 1, 2, and/or 3 steps at a time
- find a magic index in a distinct (also, not distinct) sorted array, a magic index is i where A[i] == i
- get the highest stack of boxes from a set of boxes with widths/depths/heights and each box's width & depth must be equal/smaller than the one below it