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Companies
Apple
String
String
0/60 solved
Longest Substring Without Repeating Characters
MEDIUM
Longest Palindromic Substring
MEDIUM
Valid Parentheses
EASY
Generate Parentheses
MEDIUM
Group Anagrams
MEDIUM
Letter Combinations of a Phone Number
MEDIUM
Longest Common Prefix
EASY
Minimum Window Substring
HARD
Word Search
MEDIUM
Edit Distance
MEDIUM
Roman to Integer
EASY
Palindrome Partitioning
MEDIUM
Decode String
MEDIUM
Longest Valid Parentheses
HARD
Valid Anagram
EASY
Find All Anagrams in a String
MEDIUM
Regular Expression Matching
HARD
Word Ladder
HARD
Decode Ways
MEDIUM
Implement Trie (Prefix Tree)
MEDIUM
Valid Palindrome
EASY
Add Binary
EASY
Word Search II
HARD
Evaluate Division
MEDIUM
Isomorphic Strings
EASY
First Unique Character in a String
EASY
Reverse Words in a String
MEDIUM
Reverse String
EASY
Wildcard Matching
HARD
Interleaving String
MEDIUM
Zigzag Conversion
MEDIUM
Top K Frequent Words
MEDIUM
Integer to Roman
MEDIUM
Word Pattern
EASY
Multiply Strings
MEDIUM
Minimum Remove to Make Valid Parentheses
MEDIUM
Binary Tree Paths
EASY
Find the Index of the First Occurrence in a String
EASY
Simplify Path
MEDIUM
Length of Last Word
EASY
String Compression
MEDIUM
Restore IP Addresses
MEDIUM
Jewels and Stones
EASY
Minimum Deletions to Make Character Frequencies Unique
MEDIUM
String to Integer (atoi)
MEDIUM
Time Based Key-Value Store
MEDIUM
Find Common Characters
EASY
Count and Say
MEDIUM
Text Justification
HARD
Scramble String
HARD
Shortest Distance to a Character
EASY
Fizz Buzz
EASY
Reverse Only Letters
EASY
Reverse String II
EASY
Substring with Concatenation of All Words
HARD
To Lower Case
EASY
One Edit Distance
MEDIUM
Valid Number
HARD
Palindrome Partitioning III
HARD
Serialize and Deserialize N-ary Tree
HARD