Recursion and backtracking in C#
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Problems to practice
- Permutations
- Subsets
- Combination Sum
- N-Queens
- Sudoku
- Fibonacci
Example: permutations
public void Backtrack(int[] nums, List<int> path, List<List<int>> result) {
if (path.Count == nums.Length) {
result.Add(new List<int>(path));
return;
}
for (int i = 0; i < nums.Length; i++) {
if (path.Contains(nums[i])) continue;
path.Add(nums[i]);
Backtrack(nums, path, result);
path.RemoveAt(path.Count - 1);
}
}Interview guidance
Backtracking explores choices recursively and removes the last choice when a path fails.
Adapted from 17_DSA_DOTNET.md · “6. Recursion and backtracking in C#”. Code examples are study fragments. Difficulty and core labels are editorial estimates; version-specific behavior should be checked against your project.