Dashboard Questions Topics Companies Sheets

String

Topic

744 coding problems covering String concepts. Master this topic and improve your problem-solving skills.

744

Problems

214

Easy

369

Medium

161

Hard

Difficulty

All744 Easy214 Medium369 Hard161

Title	Solve	Difficulty	Companies	Topics
402. Remove K Digits	Solve	Medium	Adobe+6	Greedy Monotonic Stack+2
418. Sentence Screen Fitting	Solve	Medium	Google	Array Dynamic Programming+1
423. Reconstruct Original Digits from English	Solve	Medium	JPMorgan	Hash Table Math+1
424. Longest Repeating Character Replacement	Solve	Medium	Adobe+3	Hash Table Sliding Window+1
433. Minimum Genetic Mutation	Solve	Medium	Amazon+4	Breadth-First Search Hash Table+1
438. Find All Anagrams in a String	Solve	Medium	Adobe+9	Hash Table Sliding Window+1
439. Ternary Expression Parser	Solve	Medium	Snapchat	Recursion Stack+1
443. String Compression	Solve	Medium	Amazon+8	String Two Pointers
449. Serialize and Deserialize BST	Solve	Medium	Amazon+2	Binary Search Tree Binary Tree+5
451. Sort Characters By Frequency	Solve	Medium	Amazon+4	Bucket Sort Counting+4
467. Unique Substrings in Wraparound String	Solve	Medium	Apple+1	Dynamic Programming String
468. Validate IP Address	Solve	Medium	Amazon+2	String
474. Ones and Zeroes	Solve	Medium	Apple	Array Dynamic Programming+1
481. Magical String	Solve	Medium	Google	String Two Pointers
484. Find Permutation	Solve	Medium	Goldman Sachs+1	Array Greedy+2
516. Longest Palindromic Subsequence	Solve	Medium	Amazon+5	Dynamic Programming String
522. Longest Uncommon Subsequence II	Solve	Medium	Apple	Array Hash Table+3
524. Longest Word in Dictionary through Deleting	Solve	Medium	Google	Array Sorting+2
535. Encode and Decode TinyURL	Solve	Medium	Amazon+2	Design Hash Function+2
536. Construct Binary Tree from String	Solve	Medium	Facebook	Binary Tree Depth-First Search+3
537. Complex Number Multiplication	Solve	Medium	Amazon	Math Simulation+1
539. Minimum Time Difference	Solve	Medium	Amazon+1	Array Math+2
544. Output Contest Matches	Solve	Medium	Google	Recursion Simulation+1
555. Split Concatenated Strings	Solve	Medium	Alibaba	Array Greedy+1
556. Next Greater Element III	Solve	Medium	Adobe+10	Math String+1
567. Permutation in String	Solve	Medium	Amazon+7	Hash Table Sliding Window+2
583. Delete Operation for Two Strings	Solve	Medium	Amazon	Dynamic Programming String
592. Fraction Addition and Subtraction	Solve	Medium	Goldman Sachs	Math Simulation+1
606. Construct String from Binary Tree	Solve	Medium	Adobe+3	Binary Tree Depth-First Search+2
609. Find Duplicate File in System	Solve	Medium	Apple+1	Array Hash Table+1
616. Add Bold Tag in String	Solve	Medium	Facebook	Array Hash Table+3
635. Design Log Storage System	Solve	Medium	Twitter	Design Hash Table+2
640. Solve the Equation	Solve	Medium	Amazon+1	Math Simulation+1
647. Palindromic Substrings	Solve	Medium	Expedia+2	Dynamic Programming String+1
648. Replace Words	Solve	Medium	Facebook	Array Hash Table+2
649. Dota2 Senate	Solve	Medium	Valve	Greedy Queue+1
676. Implement Magic Dictionary	Solve	Medium	Facebook+1	Depth-First Search Design+3
677. Map Sum Pairs	Solve	Medium	Google	Design Hash Table+2
678. Valid Parenthesis String	Solve	Medium	Amazon+4	Dynamic Programming Greedy+2
681. Next Closest Time	Solve	Medium	Amazon+1	Backtracking Enumeration+2
686. Repeated String Match	Solve	Medium	Google	String String Matching
692. Top K Frequent Words	Solve	Medium	Amazon+8	Bucket Sort Counting+5
712. Minimum ASCII Delete Sum for Two Strings	Solve	Medium	Activision+2	Dynamic Programming String
720. Longest Word in Dictionary	Solve	Medium	Google	Array Hash Table+3
721. Accounts Merge	Solve	Medium	Amazon+6	Array Breadth-First Search+5
722. Remove Comments	Solve	Medium	Apple+7	Array String
737. Sentence Similarity II	Solve	Medium	Amazon	Array Breadth-First Search+4
751. IP to CIDR	Solve	Medium	Airbnb+1	Bit Manipulation String
752. Open the Lock	Solve	Medium	Amazon+4	Array Breadth-First Search+2
758. Bold Words in String	Solve	Medium	Google	Array Hash Table+3