Backtracking Interview Questions

Array String Backtracking Depth-First Search Matrix

Rank

#1007MediumFrequency: 76.6%

Numbers With Same Consecutive Differences

Backtracking Breadth-First Search

Rank

#787HardFrequency: 75.6%

Sliding Puzzle

Array Dynamic Programming Backtracking Breadth-First Search Memoization Matrix Heuristic Search Bidirectional Search A* Search

Rank

#51HardFrequency: 73.6%

N-Queens

Array Backtracking Algorithm X

Rank

#17MediumFrequency: 73.6%

Letter Combinations of a Phone Number

Rank

#212HardFrequency: 73.4%

Word Search II

Array String Backtracking Simulation

Array String Backtracking Trie Matrix

Rank

#2166HardFrequency: 73.2%

Number of Valid Move Combinations On Chessboard

Asked at PayPal

Rank

#698MediumFrequency: 69.2%

Partition to K Equal Sum Subsets

Array Dynamic Programming Backtracking Bit Manipulation Memoization Bitmask

Rank

#22MediumFrequency: 69.1%

Generate Parentheses

String Dynamic Programming Backtracking Bracket Sequences

Rank

#757MediumFrequency: 65.5%

Pyramid Transition Matrix

Hash Table String Backtracking Bit Manipulation

#10

Rank

#638MediumFrequency: 65.5%

Shopping Offers

Array Dynamic Programming Backtracking Bit Manipulation Memoization Bitmask Knapsack Problem Complete Knapsack

#11

Rank

#78MediumFrequency: 64%

Subsets

#12

Rank

#2696MediumFrequency: 62.5%

The Number of Beautiful Subsets

Array Hash Table Math Dynamic Programming Backtracking Sorting Combinatorics

#13

Rank

#865HardFrequency: 62.4%

Robot Room Cleaner

Backtracking Interactive

#14

Rank

#39MediumFrequency: 59.5%

Combination Sum

#15

Rank

#140HardFrequency: 59.3%

Word Break II

Array Hash Table String Dynamic Programming Backtracking Trie Memoization

#16

Rank

#282HardFrequency: 58.8%

Expression Add Operators

Math String Backtracking

#17

Rank

#46MediumFrequency: 58.6%

Permutations

#18

Rank

#254MediumFrequency: 57.5%

Factor Combinations

Backtracking Prime Factorization

#19

Rank

#4071MediumFrequency: 55.8%

Word Squares II

Array String Backtracking Sorting Enumeration

#20

Rank

#3294MediumFrequency: 55.1%

Number of Self-Divisible Permutations

Array Math Dynamic Programming Backtracking Bit Manipulation Number Theory Bitmask

#21

Rank

#93MediumFrequency: 53.4%

Restore IP Addresses

Array Backtracking Bit Manipulation Matrix Hamiltonian Path

#22

Rank

#1022HardFrequency: 52.4%

Unique Paths III

Asked at Databricks

#23

Rank

#37HardFrequency: 52.1%

Sudoku Solver

Array Hash Table Backtracking Matrix Algorithm X Dancing Links

#24

Rank

#1038HardFrequency: 51%

Number of Squareful Arrays

Array Hash Table Math Dynamic Programming Backtracking Bit Manipulation Bitmask

#25

Rank

#131MediumFrequency: 50.4%

Palindrome Partitioning

String Dynamic Programming Backtracking

#26

Rank

#301HardFrequency: 50.1%

Remove Invalid Parentheses

String Backtracking Breadth-First Search

#27

Rank

#257EasyFrequency: 48.7%

Binary Tree Paths

String Backtracking Tree Depth-First Search Binary Tree

#28

Rank

#2482MediumFrequency: 48.7%

Maximum Rows Covered by Columns

Array Backtracking Bit Manipulation Matrix Enumeration

#29

Rank

#473MediumFrequency: 48%

Matchsticks to Square

Array Dynamic Programming Backtracking Bit Manipulation Bitmask

#30

Rank

#291MediumFrequency: 47.5%

Word Pattern II

#31

Rank

#465HardFrequency: 47.5%

Optimal Account Balancing

Array Dynamic Programming Backtracking Bit Manipulation Bitmask

#32

Rank

#47MediumFrequency: 46.9%

Permutations II

Array Backtracking Sorting

#33

Rank

#90MediumFrequency: 44.8%

Subsets II

#34

Rank

#126HardFrequency: 44.1%

Word Ladder II

Hash Table String Backtracking Breadth-First Search Bidirectional Search

#35

Rank

#494MediumFrequency: 44.1%

Target Sum

Array Dynamic Programming Backtracking Knapsack Problem 0-1 Knapsack

#36

Rank

#113MediumFrequency: 43.2%

Path Sum II

Backtracking Tree Depth-First Search Binary Tree

#37

Rank

#1331MediumFrequency: 41.2%

Path with Maximum Gold

#38

Rank

#77MediumFrequency: 40.2%

Combinations

#39

Rank

#40MediumFrequency: 39.1%

Combination Sum II

#40

Rank

#679HardFrequency: 39%

24 Game

Array Math Backtracking

#41

Rank

#800MediumFrequency: 35%

Letter Case Permutation

#42

Rank

#2189HardFrequency: 35%

Maximum Path Quality of a Graph

Array Backtracking Graph Theory

#43

Rank

#1076MediumFrequency: 35%

Brace Expansion

String Backtracking Stack Breadth-First Search Sorting

#44

Rank

#3951HardFrequency: 34.2%

Next Special Palindrome Number

#45

Rank

#2272HardFrequency: 33.3%

Maximum Good People Based on Statements

#46

Rank

#3092MediumFrequency: 33%

Minimum Moves to Spread Stones Over Grid

Array Dynamic Programming Backtracking Bit Manipulation Matrix Bitmask

#47

Rank

#1516MediumFrequency: 32.8%

The k-th Lexicographical String of All Happy Strings of Length n

#48

Rank

#89MediumFrequency: 32.3%

Gray Code

Math Backtracking Bit Manipulation

#49

Rank

#2823MediumFrequency: 31.1%

The Knight’s Tour

#50

Rank

#351MediumFrequency: 29.7%

Android Unlock Patterns

Dynamic Programming Backtracking Bit Manipulation Bitmask

#51

Rank

#691HardFrequency: 29.5%

Stickers to Spell Word

Array Hash Table String Dynamic Programming Backtracking Bit Manipulation Memoization Bitmask

#52

Rank

#1993EasyFrequency: 29.1%

Sum of All Subset XOR Totals

Array Math Backtracking Bit Manipulation Combinatorics Enumeration

#53

Rank

#357MediumFrequency: 28.1%

Count Numbers with Unique Digits

Math Dynamic Programming Backtracking

#54

Rank

#95MediumFrequency: 28.1%

Unique Binary Search Trees II

Dynamic Programming Backtracking Tree Binary Search Tree Binary Tree

#55

Rank

#52HardFrequency: 27.8%

N-Queens II

Backtracking Algorithm X

#56

Rank

#216MediumFrequency: 27.8%

Combination Sum III

#57

Rank

#2456MediumFrequency: 27.8%

Construct Smallest Number From DI String

String Backtracking Stack Greedy

#58

Rank

#1360MediumFrequency: 26.7%

Maximum Length of a Concatenated String with Unique Characters

#59

Rank

#1825HardFrequency: 26.5%

Find Minimum Time to Finish All Jobs

Array Dynamic Programming Backtracking Bit Manipulation Bitmask

#60

Rank

#1160MediumFrequency: 25.3%

Letter Tile Possibilities

Hash Table String Backtracking Counting

#61

Rank

#813MediumFrequency: 25.1%

All Paths From Source to Target

Backtracking Depth-First Search Breadth-First Search Graph Theory Directed Acyclic Graph

#62

Rank

#1381HardFrequency: 25.1%

Maximum Score Words Formed by Letters

Array Hash Table String Dynamic Programming Backtracking Bit Manipulation Counting Bitmask

#63

Rank

#1418MediumFrequency: 25.1%

Fair Distribution of Cookies

Array Dynamic Programming Backtracking Bit Manipulation Bitmask

#64

Rank

#294MediumFrequency: 24.6%

Flip Game II

Math Dynamic Programming Backtracking Memoization Minimax Game Theory Sprague–Grundy Theorem Impartial Game

#65

Rank

#401EasyFrequency: 24.4%

Binary Watch

#66

Rank

#3453MediumFrequency: 23.6%

Generate Binary Strings Without Adjacent Zeros

#67

Rank

#1819MediumFrequency: 23.4%

Construct the Lexicographically Largest Valid Sequence

#68

Rank

#1361HardFrequency: 23.3%

Tiling a Rectangle with the Fewest Squares

#69

Rank

#1030MediumFrequency: 23.3%

Smallest String Starting From Leaf

String Backtracking Tree Depth-First Search Binary Tree

#70

Rank

#1715MediumFrequency: 22.1%

Split a String Into the Max Number of Unique Substrings

#71

Rank

#2802MediumFrequency: 22.1%

Find the Punishment Number of an Integer

#72

Rank

#872MediumFrequency: 21.9%

Split Array into Fibonacci Sequence

#73

Rank

#1723HardFrequency: 21.9%

Maximum Number of Achievable Transfer Requests

#74

Rank

#2078MediumFrequency: 21.5%

Maximum Compatibility Score Sum

Array Dynamic Programming Backtracking Bit Manipulation Bitmask Hungarian Algorithm Bipartite Graph Successive Shortest Path Algorithm Matching (Graph)Perfect Matching Minimum-Cost Flow Flow Network

#75

Rank

#2140HardFrequency: 21.5%

Longest Subsequence Repeated k Times

Hash Table Two Pointers String Backtracking Counting Enumeration

#76

Rank

#681MediumFrequency: 20.9%

Next Closest Time

Hash Table String Backtracking Enumeration

#77

Rank

#2279MediumFrequency: 19.5%

Maximum Split of Positive Even Integers

Math Backtracking Greedy

#78

Rank

#526MediumFrequency: 19.5%

Beautiful Arrangement

Array Dynamic Programming Backtracking Bit Manipulation Bitmask

#79

Rank

#2107MediumFrequency: 19.5%

Find Unique Binary String

Array Hash Table String Backtracking

#80

Rank

#1188HardFrequency: 18%

Brace Expansion II

Hash Table String Backtracking Stack Breadth-First Search Sorting

#81

Rank

#1758HardFrequency: 18%

Distribute Repeating Integers

Array Hash Table Dynamic Programming Backtracking Bit Manipulation Counting Bitmask

#82

Rank

#320MediumFrequency: 16.4%

Generalized Abbreviation

#83

Rank

#411HardFrequency: 16.4%

Minimum Unique Word Abbreviation

#84

Rank

#425HardFrequency: 16.4%

Word Squares

Array String Backtracking Trie

#85

Rank

#834MediumFrequency: 16.4%

Ambiguous Coordinates

String Backtracking Enumeration

#86

Rank

#1067MediumFrequency: 16.4%

Campus Bikes II

Array Dynamic Programming Backtracking Bit Manipulation Bitmask Hungarian Algorithm Bipartite Graph Successive Shortest Path Algorithm Matching (Graph)Minimum-Cost Flow Flow Network

#87

Rank

#1077HardFrequency: 16.4%

Confusing Number II

#88

Rank

#1211MediumFrequency: 16.4%

Iterator for Combination

String Backtracking Design Iterator

#89

Rank

#1900MediumFrequency: 16.4%

Closest Dessert Cost

Array Dynamic Programming Backtracking Knapsack Problem Mixed Knapsack

#90

Rank

#306MediumFrequency: 16.4%

Additive Number

#91

Rank

#2174MediumFrequency: 16.4%

Next Greater Numerically Balanced Number

Hash Table Math Backtracking Counting Enumeration

#92

Rank

#2170MediumFrequency: 14.6%

Count Number of Maximum Bitwise-OR Subsets

#93

Rank

#3635HardFrequency: 12.6%

Smallest Divisible Digit Product II

Math String Backtracking Greedy Number Theory

#94

Rank

#986MediumFrequency: 7.3%

Largest Time for Given Digits

Array String Backtracking Enumeration

#95

Rank

#491MediumFrequency: 7.3%

Non-decreasing Subsequences

Array Hash Table Backtracking Bit Manipulation

#96

Rank

#1429HardFrequency: 5.5%

Verbal Arithmetic Puzzle

Array Math String Backtracking

#97

Rank

#2130MediumFrequency: 5.5%

Maximum Product of the Length of Two Palindromic Subsequences

String Dynamic Programming Backtracking Bit Manipulation Bitmask

#98

Rank

#3947MediumFrequency: 5%

Balanced K-Factor Decomposition

Math Backtracking Number Theory

#99

Rank

#2114MediumFrequency: 5%

Minimum Number of Work Sessions to Finish the Tasks

Array Dynamic Programming Backtracking Bit Manipulation Bitmask

#100

Rank

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Backtracking Interview Questions

Master 100 backtracking problems frequently asked in technical interviews. These questions test your understanding of backtrackingconcepts and are essential for coding interview success.

100

Total Problems

Easy

Medium

Hard

Word Search

Array String Backtracking Depth-First Search Matrix

Rank

#1007MediumFrequency: 76.6%

Numbers With Same Consecutive Differences

Backtracking Breadth-First Search

Rank

#787HardFrequency: 75.6%

Sliding Puzzle

Array Dynamic Programming Backtracking Breadth-First Search Memoization Matrix Heuristic Search Bidirectional Search A* Search

Rank

#51HardFrequency: 73.6%

N-Queens

Array Backtracking Algorithm X

Rank

#17MediumFrequency: 73.6%

Letter Combinations of a Phone Number

Rank

#212HardFrequency: 73.4%

Word Search II

Array String Backtracking Simulation

Array String Backtracking Trie Matrix

Rank

#2166HardFrequency: 73.2%

Number of Valid Move Combinations On Chessboard

Asked at PayPal

Rank

#698MediumFrequency: 69.2%

Partition to K Equal Sum Subsets

Array Dynamic Programming Backtracking Bit Manipulation Memoization Bitmask

Rank

#22MediumFrequency: 69.1%

Generate Parentheses

String Dynamic Programming Backtracking Bracket Sequences

Rank

#757MediumFrequency: 65.5%

Pyramid Transition Matrix

Hash Table String Backtracking Bit Manipulation

#10

Rank

#638MediumFrequency: 65.5%

Shopping Offers

Array Dynamic Programming Backtracking Bit Manipulation Memoization Bitmask Knapsack Problem Complete Knapsack

#11

Rank

#78MediumFrequency: 64%

Subsets

#12

Rank

#2696MediumFrequency: 62.5%

The Number of Beautiful Subsets

Array Hash Table Math Dynamic Programming Backtracking Sorting Combinatorics

#13

Rank

#865HardFrequency: 62.4%

Robot Room Cleaner

Backtracking Interactive

#14

Rank

#39MediumFrequency: 59.5%

Combination Sum

#15

Rank

#140HardFrequency: 59.3%

Word Break II

Array Hash Table String Dynamic Programming Backtracking Trie Memoization

#16

Rank

#282HardFrequency: 58.8%

Expression Add Operators

Math String Backtracking

#17

Rank

#46MediumFrequency: 58.6%

Permutations

#18

Rank

#254MediumFrequency: 57.5%

Factor Combinations

Backtracking Prime Factorization

#19

Rank

#4071MediumFrequency: 55.8%

Word Squares II

Array String Backtracking Sorting Enumeration

#20

Rank

#3294MediumFrequency: 55.1%

Number of Self-Divisible Permutations

Array Math Dynamic Programming Backtracking Bit Manipulation Number Theory Bitmask

#21

Rank

#93MediumFrequency: 53.4%

Restore IP Addresses

Array Backtracking Bit Manipulation Matrix Hamiltonian Path

#22

Rank

#1022HardFrequency: 52.4%

Unique Paths III

Asked at Databricks

#23

Rank

#37HardFrequency: 52.1%

Sudoku Solver

Array Hash Table Backtracking Matrix Algorithm X Dancing Links

#24

Rank

#1038HardFrequency: 51%

Number of Squareful Arrays

Array Hash Table Math Dynamic Programming Backtracking Bit Manipulation Bitmask

#25

Rank

#131MediumFrequency: 50.4%

Palindrome Partitioning

String Dynamic Programming Backtracking

#26

Rank

#301HardFrequency: 50.1%

Remove Invalid Parentheses

String Backtracking Breadth-First Search

#27

Rank

#257EasyFrequency: 48.7%

Binary Tree Paths

String Backtracking Tree Depth-First Search Binary Tree

#28

Rank

#2482MediumFrequency: 48.7%

Maximum Rows Covered by Columns

Array Backtracking Bit Manipulation Matrix Enumeration

#29

Rank

#473MediumFrequency: 48%

Matchsticks to Square

Array Dynamic Programming Backtracking Bit Manipulation Bitmask

#30

Rank

#291MediumFrequency: 47.5%

Word Pattern II

#31

Rank

#465HardFrequency: 47.5%

Optimal Account Balancing

Array Dynamic Programming Backtracking Bit Manipulation Bitmask

#32

Rank

#47MediumFrequency: 46.9%

Permutations II

Array Backtracking Sorting

#33

Rank

#90MediumFrequency: 44.8%

Subsets II

#34

Rank

#126HardFrequency: 44.1%

Word Ladder II

Hash Table String Backtracking Breadth-First Search Bidirectional Search

#35

Rank

#494MediumFrequency: 44.1%

Target Sum

Array Dynamic Programming Backtracking Knapsack Problem 0-1 Knapsack

#36

Rank

#113MediumFrequency: 43.2%

Path Sum II

Backtracking Tree Depth-First Search Binary Tree

#37

Rank

#1331MediumFrequency: 41.2%

Path with Maximum Gold

#38

Rank

#77MediumFrequency: 40.2%

Combinations

#39

Rank

#40MediumFrequency: 39.1%

Combination Sum II

#40

Rank

#679HardFrequency: 39%

24 Game

Array Math Backtracking

#41

Rank

#800MediumFrequency: 35%

Letter Case Permutation

#42

Rank

#2189HardFrequency: 35%

Maximum Path Quality of a Graph

Array Backtracking Graph Theory

#43

Rank

#1076MediumFrequency: 35%

Brace Expansion

String Backtracking Stack Breadth-First Search Sorting

#44

Rank

#3951HardFrequency: 34.2%

Next Special Palindrome Number

#45

Rank

#2272HardFrequency: 33.3%

Maximum Good People Based on Statements

#46

Rank

#3092MediumFrequency: 33%

Minimum Moves to Spread Stones Over Grid

Array Dynamic Programming Backtracking Bit Manipulation Matrix Bitmask

#47

Rank

#1516MediumFrequency: 32.8%

The k-th Lexicographical String of All Happy Strings of Length n

#48

Rank

#89MediumFrequency: 32.3%

Gray Code

Math Backtracking Bit Manipulation

#49

Rank

#2823MediumFrequency: 31.1%

The Knight’s Tour

#50

Rank

#351MediumFrequency: 29.7%

Android Unlock Patterns

Dynamic Programming Backtracking Bit Manipulation Bitmask

#51

Rank

#691HardFrequency: 29.5%

Stickers to Spell Word

Array Hash Table String Dynamic Programming Backtracking Bit Manipulation Memoization Bitmask

#52

Rank

#1993EasyFrequency: 29.1%

Sum of All Subset XOR Totals

Array Math Backtracking Bit Manipulation Combinatorics Enumeration

#53

Rank

#357MediumFrequency: 28.1%

Count Numbers with Unique Digits

Math Dynamic Programming Backtracking

#54

Rank

#95MediumFrequency: 28.1%

Unique Binary Search Trees II

Dynamic Programming Backtracking Tree Binary Search Tree Binary Tree

#55

Rank

#52HardFrequency: 27.8%

N-Queens II

Backtracking Algorithm X

#56

Rank

#216MediumFrequency: 27.8%

Combination Sum III

#57

Rank

#2456MediumFrequency: 27.8%

Construct Smallest Number From DI String

String Backtracking Stack Greedy

#58

Rank

#1360MediumFrequency: 26.7%

Maximum Length of a Concatenated String with Unique Characters

#59

Rank

#1825HardFrequency: 26.5%

Find Minimum Time to Finish All Jobs

Array Dynamic Programming Backtracking Bit Manipulation Bitmask

#60

Rank

#1160MediumFrequency: 25.3%

Letter Tile Possibilities

Hash Table String Backtracking Counting

#61

Rank

#813MediumFrequency: 25.1%

All Paths From Source to Target

Backtracking Depth-First Search Breadth-First Search Graph Theory Directed Acyclic Graph

#62

Rank

#1381HardFrequency: 25.1%

Maximum Score Words Formed by Letters

Array Hash Table String Dynamic Programming Backtracking Bit Manipulation Counting Bitmask

#63

Rank

#1418MediumFrequency: 25.1%

Fair Distribution of Cookies

Array Dynamic Programming Backtracking Bit Manipulation Bitmask

#64

Rank

#294MediumFrequency: 24.6%

Flip Game II

Math Dynamic Programming Backtracking Memoization Minimax Game Theory Sprague–Grundy Theorem Impartial Game

#65

Rank

#401EasyFrequency: 24.4%

Binary Watch

#66

Rank

#3453MediumFrequency: 23.6%

Generate Binary Strings Without Adjacent Zeros

#67

Rank

#1819MediumFrequency: 23.4%

Construct the Lexicographically Largest Valid Sequence

#68

Rank

#1361HardFrequency: 23.3%

Tiling a Rectangle with the Fewest Squares

#69

Rank

#1030MediumFrequency: 23.3%

Smallest String Starting From Leaf

String Backtracking Tree Depth-First Search Binary Tree

#70

Rank

#1715MediumFrequency: 22.1%

Split a String Into the Max Number of Unique Substrings

#71

Rank

#2802MediumFrequency: 22.1%

Find the Punishment Number of an Integer

#72

Rank

#872MediumFrequency: 21.9%

Split Array into Fibonacci Sequence

#73

Rank

#1723HardFrequency: 21.9%

Maximum Number of Achievable Transfer Requests

#74

Rank

#2078MediumFrequency: 21.5%

Maximum Compatibility Score Sum

Array Dynamic Programming Backtracking Bit Manipulation Bitmask Hungarian Algorithm Bipartite Graph Successive Shortest Path Algorithm Matching (Graph)Perfect Matching Minimum-Cost Flow Flow Network

#75

Rank

#2140HardFrequency: 21.5%

Longest Subsequence Repeated k Times

Hash Table Two Pointers String Backtracking Counting Enumeration

#76

Rank

#681MediumFrequency: 20.9%

Next Closest Time

Hash Table String Backtracking Enumeration

#77

Rank

#2279MediumFrequency: 19.5%

Maximum Split of Positive Even Integers

Math Backtracking Greedy

#78

Rank

#526MediumFrequency: 19.5%

Beautiful Arrangement

Array Dynamic Programming Backtracking Bit Manipulation Bitmask

#79

Rank

#2107MediumFrequency: 19.5%

Find Unique Binary String

Array Hash Table String Backtracking

#80

Rank

#1188HardFrequency: 18%

Brace Expansion II

Hash Table String Backtracking Stack Breadth-First Search Sorting

#81

Rank

#1758HardFrequency: 18%

Distribute Repeating Integers

Array Hash Table Dynamic Programming Backtracking Bit Manipulation Counting Bitmask

#82

Rank

#320MediumFrequency: 16.4%

Generalized Abbreviation

#83

Rank

#411HardFrequency: 16.4%

Minimum Unique Word Abbreviation

#84

Rank

#425HardFrequency: 16.4%

Word Squares

Array String Backtracking Trie

#85

Rank

#834MediumFrequency: 16.4%

Ambiguous Coordinates

String Backtracking Enumeration

#86

Rank

#1067MediumFrequency: 16.4%

Campus Bikes II

Array Dynamic Programming Backtracking Bit Manipulation Bitmask Hungarian Algorithm Bipartite Graph Successive Shortest Path Algorithm Matching (Graph)Minimum-Cost Flow Flow Network

#87

Rank

#1077HardFrequency: 16.4%

Confusing Number II

#88

Rank

#1211MediumFrequency: 16.4%

Iterator for Combination

String Backtracking Design Iterator

#89

Rank

#1900MediumFrequency: 16.4%

Closest Dessert Cost

Array Dynamic Programming Backtracking Knapsack Problem Mixed Knapsack

#90

Rank

#306MediumFrequency: 16.4%

Additive Number

#91

Rank

#2174MediumFrequency: 16.4%

Next Greater Numerically Balanced Number

Hash Table Math Backtracking Counting Enumeration

#92

Rank

#2170MediumFrequency: 14.6%

Count Number of Maximum Bitwise-OR Subsets

#93

Rank

#3635HardFrequency: 12.6%

Smallest Divisible Digit Product II

Math String Backtracking Greedy Number Theory

#94

Rank

#986MediumFrequency: 7.3%

Largest Time for Given Digits

Array String Backtracking Enumeration

#95

Rank

#491MediumFrequency: 7.3%

Non-decreasing Subsequences

Array Hash Table Backtracking Bit Manipulation

#96

Rank

#1429HardFrequency: 5.5%

Verbal Arithmetic Puzzle

Array Math String Backtracking

#97

Rank

#2130MediumFrequency: 5.5%

Maximum Product of the Length of Two Palindromic Subsequences

String Dynamic Programming Backtracking Bit Manipulation Bitmask

#98

Rank

#3947MediumFrequency: 5%

Balanced K-Factor Decomposition

Math Backtracking Number Theory

#99

Rank

#2114MediumFrequency: 5%

Minimum Number of Work Sessions to Finish the Tasks