String is basic. But it could be very tough as well.
The most impressive problems to me:
See all string problems: #string.
- Review: String Problems
- LintCode: Word Sorting
- LintCode: String to Integer
- Lintcode: String Replace
- LintCode: Simple Calculator
- LintCode: Lowercase to Uppercase II
- LintCode: Delete Characters
- LintCode: Char to Integer
- Leetcode: Word Subsets
- Leetcode: Word Ladder II
- Leetcode: Word Ladder
- Leetcode: Validate IP Address
- Leetcode: Valid Word Abbreviation
- Leetcode: Valid Parenthesis String
- Leetcode: Unique Morse Code Words
- Leetcode: Unique Letter String
- Leetcode: To Lower Case
- Leetcode: Text Justification
- Leetcode: Substring with Concatenation of All Words
- Leetcode: Student Attendance Record I
- Leetcode: Strobogrammatic Number II
- Leetcode: Strobogrammatic Number
- Leetcode: String Compression
- Leetcode: Split Array into Fibonacci Sequence
- Leetcode: Special Binary String
- Leetcode: Similar RGB Color
- Leetcode: Shifting Letters
- Leetcode: Rotated Digits
- Leetcode: Rotate String
- Leetcode: Reverse Words in a String III
- Leetcode: Reverse Words in a String II
- Leetcode: Reverse Words in a String
- Leetcode: Reverse Vowels of a String
- Leetcode: Reverse String II
- Leetcode: Reverse String
- Leetcode: Reverse Only Letters
- Leetcode: Repeated String Match
- Leetcode: Reorganize String
- Leetcode: Remove All Adjacent Duplicates In String
- Leetcode: Ransom Note
- Leetcode: Positions of Large Groups
- Leetcode: One Edit Distance
- Leetcode: Occurrences After Bigram
- Leetcode: Number of Segments in a String
- Leetcode: Number of Lines To Write String
- Leetcode: Most Common Word
- Leetcode: Masking Personal Information
- Leetcode: Magical String
- Leetcode: Longest Word in Dictionary through Deleting
- Leetcode: Longest Substring with At Most Two Distinct Characters
- Leetcode: Longest Substring with At Most K Distinct Characters
- Leetcode: Longest Repeating Character Replacement
- Leetcode: License Key Formatting
- Leetcode: Length of Last Word
- Leetcode: Isomorphic Strings II
- Leetcode: Interleaving String
- Leetcode: Integer to English Words
- Leetcode: Groups of Special-Equivalent Strings
- Leetcode: Group Shifted Strings
- Leetcode: Goat Latin
- Leetcode: Flip Game II
- Leetcode: Flip Game
- Leetcode: First Unique Character in a String
- Leetcode: Find the Difference
- Leetcode: Find And Replace in String
- Leetcode: Expressive Words
- Leetcode: Encode and Decode Strings
- Leetcode: Detect Capital
- Leetcode: Defanging an IP Address
- Leetcode: Custom Sort String
- Leetcode: Count and Say
- Leetcode: Bulls and Cows
- Leetcode: Buddy Strings
- Leetcode: Binary Gap
- Leetcode: Backspace String Compare
- Leetcode: Add Bold Tag in String
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