String Interview Questions
663 real interview questions test String. Practice any of them in the code editor and get AI feedback on your solution.
- Junior30% (202)
- Mid/Senior48% (317)
- Staff22% (144)
Companies that ask String the most
Questionspage 1 of 7
- Valid Parentheses119 companiesJunior
- Longest Substring Without Repeating Characters112 companiesMid/Senior
- Group Anagrams91 companiesMid/Senior
- Longest Palindromic Substring76 companiesMid/Senior
- Longest Common Prefix57 companiesJunior
- Roman to Integer45 companiesJunior
- Valid Palindrome44 companiesJunior
- Letter Combinations of a Phone Number40 companiesMid/Senior
- Generate Parentheses40 companiesMid/Senior
- Text Justification40 companiesStaff
- Word Search40 companiesMid/Senior
- Word Ladder40 companiesStaff
- Decode String40 companiesMid/Senior
- Valid Anagram38 companiesJunior
- String Compression38 companiesMid/Senior
- Minimum Window Substring34 companiesStaff
- Basic Calculator II33 companiesMid/Senior
- Integer to Roman32 companiesMid/Senior
- Word Break32 companiesMid/Senior
- Edit Distance31 companiesMid/Senior
- Reverse Words in a String29 companiesMid/Senior
- Longest Valid Parentheses28 companiesStaff
- Regular Expression Matching27 companiesStaff
- First Unique Character in a String26 companiesJunior
- Simplify Path25 companiesMid/Senior
- Palindromic Substrings25 companiesMid/Senior
- Top K Frequent Words24 companiesMid/Senior
- Decode Ways23 companiesMid/Senior
- Basic Calculator23 companiesStaff
- Integer to English Words23 companiesStaff
- Evaluate Division23 companiesMid/Senior
- Remove K Digits23 companiesMid/Senior
- Largest Number22 companiesMid/Senior
- Reconstruct Itinerary22 companiesStaff
- Longest Repeating Character Replacement22 companiesMid/Senior
- Reorganize String21 companiesMid/Senior
- Search Suggestions System21 companiesMid/Senior
- Word Search II20 companiesStaff
- Longest Common Subsequence20 companiesMid/Senior
- Zigzag Conversion19 companiesMid/Senior
- String to Integer (atoi)19 companiesMid/Senior
- Fizz Buzz19 companiesJunior
- Wildcard Matching18 companiesStaff
- Restore IP Addresses18 companiesMid/Senior
- Count Binary Substrings18 companiesJunior
- Accounts Merge18 companiesMid/Senior
- Remove All Adjacent Duplicates in String II18 companiesMid/Senior
- Find the Index of the First Occurrence in a String17 companiesJunior
- Multiply Strings17 companiesMid/Senior
- Find the Length of the Longest Common Prefix17 companiesMid/Senior
- Word Ladder II16 companiesStaff
- Word Break II16 companiesStaff
- Find All Anagrams in a String16 companiesMid/Senior
- Permutation in String16 companiesMid/Senior
- Valid Palindrome II16 companiesJunior
- Remove All Adjacent Duplicates In String16 companiesJunior
- Longest String Chain16 companiesMid/Senior
- Isomorphic Strings15 companiesJunior
- Reverse String15 companiesJunior
- Is Subsequence15 companiesJunior
- Sort Characters By Frequency15 companiesMid/Senior
- Valid Parenthesis String15 companiesMid/Senior
- Open the Lock15 companiesMid/Senior
- Distinct Subsequences14 companiesStaff
- Add Strings14 companiesJunior
- Longest Palindromic Subsequence14 companiesMid/Senior
- Backspace String Compare14 companiesJunior
- Count and Say13 companiesMid/Senior
- Add Binary13 companiesJunior
- Interleaving String13 companiesMid/Senior
- Remove Duplicate Letters13 companiesMid/Senior
- Next Greater Element III13 companiesMid/Senior
- Remove All Occurrences of a Substring13 companiesMid/Senior
- Minimum Number of Swaps to Make the String Balanced13 companiesMid/Senior
- Reverse Vowels of a String12 companiesJunior
- Ransom Note12 companiesJunior
- Validate IP Address12 companiesMid/Senior
- Special Binary String12 companiesStaff
- Rotate String12 companiesJunior
- Count Vowel Substrings of a String12 companiesJunior
- Count Palindromic Subsequences12 companiesStaff
- Robot Bounded In Circle11 companiesMid/Senior
- Minimum Remove to Make Valid Parentheses11 companiesMid/Senior
- Find All Possible Recipes from Given Supplies11 companiesMid/Senior
- Substring with Concatenation of All Words10 companiesStaff
- Palindrome Partitioning II10 companiesStaff
- Compare Version Numbers10 companiesMid/Senior
- Fraction to Recurring Decimal10 companiesMid/Senior
- Excel Sheet Column Number10 companiesJunior
- Remove Invalid Parentheses10 companiesStaff
- Minimum Number of Steps to Make Two Strings Anagram10 companiesMid/Senior
- Merge Strings Alternately10 companiesJunior
- Palindrome Partitioning9 companiesMid/Senior
- Shortest Palindrome9 companiesStaff
- Word Pattern9 companiesJunior
- Longest Substring with At Least K Repeating Characters9 companiesMid/Senior
- Longest Palindrome9 companiesJunior
- Minimum Time Difference9 companiesMid/Senior
- Strange Printer9 companiesStaff
- Partition Labels9 companiesMid/Senior