Recursion and backtracking in Java
Practice this questionWANT TO UNDERSTAND THE CONCEPT FIRST?Learn Recursion and backtracking in Java
Problems to practice
- Fibonacci
- Factorial
- Permutations
- Subsets
- N-Queens
- Sudoku
- Combination Sum
Example: subset generation
public void backtrack(int[] nums, int start, List<Integer> path, List<List<Integer>> result) {
result.add(new ArrayList<>(path));
for (int i = start; i < nums.length; i++) {
path.add(nums[i]);
backtrack(nums, i + 1, path, result);
path.remove(path.size() - 1);
}
}Interview guidance
Base case is critical. Backtracking means explore a choice, then undo it.
Adapted from 15_DSA_JAVA.md · “6. Recursion and backtracking in Java”. Code examples are study fragments. Difficulty and core labels are editorial estimates; version-specific behavior should be checked against your project.