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Mock Interview
Dashboard
Jobs
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Help
PhantomCodeAI
Features
Mock Interview
Dashboard
Jobs
Pricing
Resources
Help
Features
Mock Interview
Dashboard
Jobs
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Resources
Help
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LeetCode Problems
Backtracking
Backtracking
Problems
88 Backtracking LeetCode problems · Solve with AI-powered hints & step-by-step explanations.
17
Letter Combinations of a Phone Number
Medium
22
Generate Parentheses
Medium
37
Sudoku Solver
Hard
39
Combination Sum
Medium
40
Combination Sum II
Medium
46
Permutations
Medium
47
Permutations II
Medium
51
N-Queens
Hard
52
N-Queens II
Hard
77
Combinations
Medium
78
Subsets
Medium
79
Word Search
Medium
89
Gray Code
Medium
90
Subsets II
Medium
93
Restore IP Addresses
Medium
95
Unique Binary Search Trees II
Medium
113
Path Sum II
Medium
126
Word Ladder II
Hard
131
Palindrome Partitioning
Medium
140
Word Break II
Hard
212
Word Search II
Hard
216
Combination Sum III
Medium
257
Binary Tree Paths
Easy
282
Expression Add Operators
Hard
301
Remove Invalid Parentheses
Hard
306
Additive Number
Medium
357
Count Numbers with Unique Digits
Medium
401
Binary Watch
Easy
473
Matchsticks to Square
Medium
491
Non-decreasing Subsequences
Medium
494
Target Sum
Medium
526
Beautiful Arrangement
Medium
638
Shopping Offers
Medium
679
24 Game
Hard
691
Stickers to Spell Word
Hard
698
Partition to K Equal Sum Subsets
Medium
773
Sliding Puzzle
Hard
784
Letter Case Permutation
Medium
797
All Paths From Source to Target
Medium
816
Ambiguous Coordinates
Medium
842
Split Array into Fibonacci Sequence
Medium
949
Largest Time for Given Digits
Medium
967
Numbers With Same Consecutive Differences
Medium
980
Unique Paths III
Hard
988
Smallest String Starting From Leaf
Medium
996
Number of Squareful Arrays
Hard
1079
Letter Tile Possibilities
Medium
1096
Brace Expansion II
Hard
1219
Path with Maximum Gold
Medium
1238
Circular Permutation in Binary Representation
Medium
1239
Maximum Length of a Concatenated String with Unique Characters
Medium
1240
Tiling a Rectangle with the Fewest Squares
Hard
1255
Maximum Score Words Formed by Letters
Hard
1286
Iterator for Combination
Medium
1307
Verbal Arithmetic Puzzle
Hard
1415
The k-th Lexicographical String of All Happy Strings of Length n
Medium
1467
Probability of a Two Boxes Having The Same Number of Distinct Balls
Hard
1593
Split a String Into the Max Number of Unique Substrings
Medium
1601
Maximum Number of Achievable Transfer Requests
Hard
1655
Distribute Repeating Integers
Hard
1718
Construct the Lexicographically Largest Valid Sequence
Medium
1723
Find Minimum Time to Finish All Jobs
Hard
1774
Closest Dessert Cost
Medium
1799
Maximize Score After N Operations
Hard
1849
Splitting a String Into Descending Consecutive Values
Medium
1863
Sum of All Subset XOR Totals
Easy
1947
Maximum Compatibility Score Sum
Medium
1980
Find Unique Binary String
Medium
1986
Minimum Number of Work Sessions to Finish the Tasks
Medium
2002
Maximum Product of the Length of Two Palindromic Subsequences
Medium
2014
Longest Subsequence Repeated k Times
Hard
2044
Count Number of Maximum Bitwise-OR Subsets
Medium
2048
Next Greater Numerically Balanced Number
Medium
2056
Number of Valid Move Combinations On Chessboard
Hard
2065
Maximum Path Quality of a Graph
Hard
2151
Maximum Good People Based on Statements
Hard
2178
Maximum Split of Positive Even Integers
Medium
2212
Maximum Points in an Archery Competition
Medium
2305
Fair Distribution of Cookies
Medium
2375
Construct Smallest Number From DI String
Medium
2397
Maximum Rows Covered by Columns
Medium
2597
The Number of Beautiful Subsets
Medium
2698
Find the Punishment Number of an Integer
Medium
2708
Maximum Strength of a Group
Medium
2767
Partition String Into Minimum Beautiful Substrings
Medium
3211
Generate Binary Strings Without Adjacent Zeros
Medium
3348
Smallest Divisible Digit Product II
Hard
3376
Minimum Time to Break Locks I
Medium
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