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Companies
Apple
Backtracking
Backtracking
0/20 solved
Generate Parentheses
MEDIUM
Permutations
MEDIUM
Combination Sum
MEDIUM
Letter Combinations of a Phone Number
MEDIUM
Subsets
MEDIUM
Word Search
MEDIUM
Palindrome Partitioning
MEDIUM
N-Queens
HARD
Combination Sum II
MEDIUM
Subsets II
MEDIUM
Sudoku Solver
HARD
Word Search II
HARD
Permutations II
MEDIUM
Combinations
MEDIUM
Unique Binary Search Trees II
MEDIUM
Binary Tree Paths
EASY
Restore IP Addresses
MEDIUM
Gray Code
MEDIUM
Binary Watch
EASY
Number of Squareful Arrays
HARD