Recursion and backtracking
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Recursion
A function calls itself to solve smaller subproblems.
Problems to practice
- Fibonacci
- Factorial
- Tower of Hanoi
- Binary tree traversal
- permutations
- subsets
- combinations
- N-Queens
- Sudoku solver
Backtracking
Try a choice, recurse, then undo if it fails.
Example
Generate all subsets or permutations by exploring choices and removing the last choice when it does not work.
Important considerations
Always have a base case and avoid infinite recursion.
Adapted from 14_DSA_MASTER.md · “7. Recursion and backtracking”. Code examples are study fragments. Difficulty and core labels are editorial estimates; version-specific behavior should be checked against your project.