Practice problems across 75+ categories
Practice problems frequently asked at String • 803 problems | 228 Easy | 390 Medium | 177 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 766 | Uncommon Words from Two Sentences | Easy | Hash TableStringCounting |
| 767 | Unique Email Addresses | Easy | ArrayHash TableString |
| 768 | Unique Length-3 Palindromic Subsequences | Medium | Hash TableStringBit Manipulation |
| 769 | Unique Morse Code Words | Easy | ArrayHash TableString |
| 770 | Unique Substrings in Wraparound String | Medium | StringDynamic Programming |
| 771 | Unique Word Abbreviation | Medium | ArrayHash TableString |
| 772 | Using a Robot to Print the Lexicographically Smallest String | Medium | Hash TableStringStack |
| 773 | Valid Anagram | Easy | Hash TableStringSorting |
| 774 | Valid Number | Hard | String |
| 775 | Valid Palindrome | Easy | Two PointersString |
| 776 | Valid Palindrome II | Easy | Two PointersStringGreedy |
| 777 | Valid Palindrome III | Hard | StringDynamic Programming |
| 778 | Valid Palindrome IV | Medium | Two PointersString |
| 779 | Valid Parentheses | Easy | StringStack |
| 780 | Valid Parenthesis String | Medium | StringDynamic ProgrammingStack |
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