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
211. Design Add and Search Words Data Structure	Solve	Medium	Amazon+6	Depth-First Search Design+2
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
227. Basic Calculator II	Solve	Medium	Amazon+9	Math Stack+1
241. Different Ways to Add Parentheses	Solve	Medium	Bloomberg+2	Dynamic Programming Math+3
242. Valid Anagram	Solve	Easy	Affirm+8	Hash Table Sorting+1
243. Shortest Word Distance	Solve	Easy	Amazon+4	Array String
244. Shortest Word Distance II	Solve	Medium	LinkedIn	Array Design+3
245. Shortest Word Distance III	Solve	Medium	Amazon+1	Array String
246. Strobogrammatic Number	Solve	Easy	Facebook+1	Hash Table String+1
247. Strobogrammatic Number II	Solve	Medium	Facebook+2	Array Recursion+1
248. Strobogrammatic Number III	Solve	Hard	Google	Array Recursion+1
249. Group Shifted Strings	Solve	Medium	Facebook+1	Array Hash Table+1
257. Binary Tree Paths	Solve	Easy	Amazon+4	Backtracking Binary Tree+3
266. Palindrome Permutation	Solve	Easy	Facebook	Bit Manipulation Hash Table+1
267. Palindrome Permutation II	Solve	Medium	Cruise Automation+1	Backtracking Hash Table+1
269. Alien Dictionary	Solve	Hard	Airbnb+8	Array Breadth-First Search+4
271. Encode and Decode Strings	Solve	Medium	Facebook+1	Array Design+1
273. Integer to English Words	Solve	Hard	Amazon+7	Math Recursion+1
282. Expression Add Operators	Solve	Hard	Facebook	Backtracking Math+1
288. Unique Word Abbreviation	Solve	Medium	Facebook+1	Array Design+2
290. Word Pattern	Solve	Easy	Adobe+3	Hash Table String
291. Word Pattern II	Solve	Medium	Bolt+2	Backtracking Hash Table+1
293. Flip Game	Solve	Easy	Google	String
297. Serialize and Deserialize Binary Tree	Solve	Hard	Amazon+8	Binary Tree Breadth-First Search+4
299. Bulls and Cows	Solve	Medium	Facebook+1	Counting Hash Table+1
301. Remove Invalid Parentheses	Solve	Hard	Amazon+1	Backtracking Breadth-First Search+1
306. Additive Number	Solve	Medium	Booking.com+1	Backtracking String
316. Remove Duplicate Letters	Solve	Medium	Amazon+6	Greedy Monotonic Stack+2
318. Maximum Product of Word Lengths	Solve	Medium	Bloomberg	Array Bit Manipulation+1
320. Generalized Abbreviation	Solve	Medium	Google	Backtracking Bit Manipulation+1
331. Verify Preorder Serialization of a Binary Tree	Solve	Medium	Google	Binary Tree Stack+2
336. Palindrome Pairs	Solve	Hard	Airbnb+5	Array Hash Table+2
340. Longest Substring with At Most K Distinct Characters	Solve	Medium	Amazon+1	Hash Table Sliding Window+1
344. Reverse String	Solve	Easy	Adobe+6	String Two Pointers
345. Reverse Vowels of a String	Solve	Easy	Bloomberg	String Two Pointers
358. Rearrange String k Distance Apart	Solve	Hard	Google+3	Counting Greedy+4
383. Ransom Note	Solve	Easy	Adobe+3	Counting Hash Table+1
385. Mini Parser	Solve	Medium	Airbnb	Depth-First Search Stack+1
387. First Unique Character in a String	Solve	Easy	Amazon+8	Counting Hash Table+2
388. Longest Absolute File Path	Solve	Medium	Amazon+1	Depth-First Search Stack+1
389. Find the Difference	Solve	Easy	Adobe+4	Bit Manipulation Hash Table+2
392. Is Subsequence	Solve	Easy	Accolite+15	Dynamic Programming String+1
394. Decode String	Solve	Medium	Adobe+16	Recursion Stack+1
395. Longest Substring with At Least K Repeating Characters	Solve	Medium	Amazon+1	Divide and Conquer Hash Table+2
399. Evaluate Division	Solve	Medium	Adobe+8	Array Breadth-First Search+5
402. Remove K Digits	Solve	Medium	Adobe+6	Greedy Monotonic Stack+2
408. Valid Word Abbreviation	Solve	Easy	Facebook+1	String Two Pointers
409. Longest Palindrome	Solve	Easy	Amazon	Greedy Hash Table+1