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
10. Regular Expression Matching	Solve	Hard	Adobe+8	Dynamic Programming Recursion+1
30. Substring with Concatenation of All Words	Solve	Hard	Amazon+4	Hash Table Sliding Window+1
32. Longest Valid Parentheses	Solve	Hard	Amazon+6	Dynamic Programming Stack+1
44. Wildcard Matching	Solve	Hard	Amazon+5	Dynamic Programming Greedy+2
65. Valid Number	Solve	Hard	Facebook+1	String
68. Text Justification	Solve	Hard	Adobe+25	Array Simulation+1
76. Minimum Window Substring	Solve	Hard	Adobe+9	Hash Table Sliding Window+1
87. Scramble String	Solve	Hard	Yahoo	Dynamic Programming String
115. Distinct Subsequences	Solve	Hard	Amazon+2	Dynamic Programming String
126. Word Ladder II	Solve	Hard	Amazon+4	Backtracking Breadth-First Search+2
127. Word Ladder	Solve	Hard	Adobe+8	Breadth-First Search Hash Table+1
132. Palindrome Partitioning II	Solve	Hard	Amazon	Dynamic Programming String
140. Word Break II	Solve	Hard	Adobe+7	Array Backtracking+5
212. Word Search II	Solve	Hard	Amazon+9	Array Backtracking+3
214. Shortest Palindrome	Solve	Hard	Apple+3	Hash Function Rolling Hash+2
224. Basic Calculator	Solve	Hard	Adobe+8	Math Recursion+2
248. Strobogrammatic Number III	Solve	Hard	Google	Array Recursion+1
269. Alien Dictionary	Solve	Hard	Airbnb+8	Array Breadth-First Search+4
273. Integer to English Words	Solve	Hard	Amazon+7	Math Recursion+1
282. Expression Add Operators	Solve	Hard	Facebook	Backtracking Math+1
297. Serialize and Deserialize Binary Tree	Solve	Hard	Amazon+8	Binary Tree Breadth-First Search+4
301. Remove Invalid Parentheses	Solve	Hard	Amazon+1	Backtracking Breadth-First Search+1
336. Palindrome Pairs	Solve	Hard	Airbnb+5	Array Hash Table+2
358. Rearrange String k Distance Apart	Solve	Hard	Google+3	Counting Greedy+4
411. Minimum Unique Word Abbreviation	Solve	Hard	Google	Array Backtracking+2
420. Strong Password Checker	Solve	Hard	Amazon+1	Greedy Heap (Priority Queue)+1
425. Word Squares	Solve	Hard	Google	Array Backtracking+2
428. Serialize and Deserialize N-ary Tree	Solve	Hard	Amazon+7	Breadth-First Search Depth-First Search+2
466. Count The Repetitions	Solve	Hard	Amazon	Dynamic Programming String
471. Encode String with Shortest Length	Solve	Hard	Google	Dynamic Programming String
472. Concatenated Words	Solve	Hard	Amazon+1	Array Depth-First Search+3
488. Zuma Game	Solve	Hard	Baidu+2	Breadth-First Search Dynamic Programming+3
499. The Maze III	Solve	Hard	Google	Array Breadth-First Search+6
514. Freedom Trail	Solve	Hard	DE Shaw+1	Breadth-First Search Depth-First Search+2
527. Word Abbreviation	Solve	Hard	Google+1	Array Greedy+3
564. Find the Closest Palindrome	Solve	Hard	Amazon+5	Math String
588. Design In-Memory File System	Solve	Hard	Amazon+5	Design Hash Table+3
591. Tag Validator	Solve	Hard	Airbnb+1	Stack String
639. Decode Ways II	Solve	Hard	Microsoft	Dynamic Programming String
642. Design Search Autocomplete System	Solve	Hard	Amazon+5	Data Stream Depth-First Search+5
664. Strange Printer	Solve	Hard	Google+2	Dynamic Programming String
691. Stickers to Spell Word	Solve	Hard	Facebook	Array Backtracking+4
726. Number of Atoms	Solve	Hard	Amazon+5	Hash Table Sorting+2
727. Minimum Window Subsequence	Solve	Hard	Google	Dynamic Programming Sliding Window+1
730. Count Different Palindromic Subsequences	Solve	Hard	Apple+3	Dynamic Programming String
736. Parse Lisp Expression	Solve	Hard	Affirm	Hash Table Recursion+2
745. Prefix and Suffix Search	Solve	Hard	Facebook+2	Array Design+3
761. Special Binary String	Solve	Hard	Coursera+1	Recursion String
770. Basic Calculator IV	Solve	Hard	Adobe+1	Hash Table Math+3
772. Basic Calculator III	Solve	Hard	Amazon+12	Math Recursion+2