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← Roadmapsall recursion & backtracking problems
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Recursion & Backtracking

Subsets, permutations, combinations, grid solving.

5 stops · 80 problems0/51 on the path done
next ▸ Count SubsetsSilver · 1050
1

Subsets & combos

0/16 of 24you are here

Subsets, combinations, parentheses, phone letters.

○Count Subsets○Combinations (n choose k)○Count Combinations (n choose k)○Subsets With Duplicates○Generate Parentheses○Deepest Parenthesis Nesting○Count Subsets of Size K○Combination Sum○Combination Sum III — Count○Generate All Subsets (Lexicographic)○Combination Sum II○Generate Valid Parentheses○Valid Parenthesizations Count○Subsets Hitting A Target Sum○Sum Over Every Subset Sum○Coin Combinations For An Amount+8 in the arena
2

Permutations

0/6

Permutations, with duplicates.

○Count Permutations of Distinct Items○Letter Case Permutation○Permutations With Duplicates○Unique Permutations (Count)○Generate All Permutations○Beautiful Arrangement
3

Sum & partition

0/4

Combination sum, palindrome partition, IP.

○Palindrome Partitioning○Restore IP Addresses○Palindrome Partitioning (Count)○Restore IP Addresses (Count)
4

Grid & constraints

0/9

N-Queens, sudoku, word search, maze, paths.

○Validate Sudoku Board○Count Paths Avoiding Obstacles○Count Grid Paths○Word Search Exists○Grid Routes Around Blocked Cells○Knight Dialer Number Count○Word Search○Count Grid Paths With Obstacles○Valid Sudoku Board
5

More Recursion & Backtracking

0/16 of 37

Everything else in this category — keep climbing.

○Sum of Array○Count Numbers With Unique Digits○Generalized Abbreviations Count○Digital Root○Count Regions (Flood Fill)○Count Leaves In A Nested Array○Recursive Greatest Common Divisor○Repeated Digit-Sum Root○Domino Tilings Of A Two By N Strip○Recursively Reverse An Array○Largest Value In A Nested Array○Total Of A Nested Integer Array○Maximum Nesting Depth Of An Array○Fully Flatten A Nested Array○Binary Strings Without Adjacent Ones○Monotonic Lattice Path Count+21 in the arena
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