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
3. Longest Substring Without Repeating Characters	Solve	Medium	Adobe+20	Hash Table Sliding Window+1
5. Longest Palindromic Substring	Solve	Medium	Accenture+50	Dynamic Programming String+1
6. Zigzag Conversion	Solve	Medium	Adobe+2	String
8. String to Integer (atoi)	Solve	Medium	Adobe+8	String
10. Regular Expression Matching	Solve	Hard	Adobe+8	Dynamic Programming Recursion+1
12. Integer to Roman	Solve	Medium	Adobe+8	Hash Table Math+1
13. Roman to Integer	Solve	Easy	Accenture+18	Hash Table Math+1
14. Longest Common Prefix	Solve	Easy	Adobe+9	String Trie
17. Letter Combinations of a Phone Number	Solve	Medium	Airtel+34	Backtracking Hash Table+1
20. Valid Parentheses	Solve	Easy	Adobe+25	Stack String
22. Generate Parentheses	Solve	Medium	Adobe+12	Backtracking Dynamic Programming+1
28. Find the Index of the First Occurrence in a String	Solve	Easy	Amazon+4	String String Matching+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
38. Count and Say	Solve	Medium	Adobe+6	String
43. Multiply Strings	Solve	Medium	Adobe+5	Math Simulation+1
44. Wildcard Matching	Solve	Hard	Amazon+5	Dynamic Programming Greedy+2
49. Group Anagrams	Solve	Medium	Adobe+23	Array Hash Table+2
58. Length of Last Word	Solve	Easy	Amazon+1	String
65. Valid Number	Solve	Hard	Facebook+1	String
67. Add Binary	Solve	Easy	Adobe+5	Bit Manipulation Math+2
68. Text Justification	Solve	Hard	Adobe+25	Array Simulation+1
71. Simplify Path	Solve	Medium	Amazon+3	Stack String
72. Edit Distance	Solve	Medium	Amazon+7	Dynamic Programming String
76. Minimum Window Substring	Solve	Hard	Adobe+9	Hash Table Sliding Window+1
79. Word Search	Solve	Medium	Amazon+8	Array Backtracking+2
87. Scramble String	Solve	Hard	Yahoo	Dynamic Programming String
91. Decode Ways	Solve	Medium	Amazon+8	Dynamic Programming String
93. Restore IP Addresses	Solve	Medium	Amazon+6	Backtracking String
97. Interleaving String	Solve	Medium	Amazon+23	Dynamic Programming String
115. Distinct Subsequences	Solve	Hard	Amazon+2	Dynamic Programming String
125. Valid Palindrome	Solve	Easy	Adobe+8	String Two Pointers
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
131. Palindrome Partitioning	Solve	Medium	Amazon+4	Backtracking Dynamic Programming+1
132. Palindrome Partitioning II	Solve	Hard	Amazon	Dynamic Programming String
139. Word Break	Solve	Medium	Accenture+38	Array Dynamic Programming+4
140. Word Break II	Solve	Hard	Adobe+7	Array Backtracking+5
151. Reverse Words in a String	Solve	Medium	Amazon+5	String Two Pointers
159. Longest Substring with At Most Two Distinct Characters	Solve	Medium	Amazon+1	Hash Table Sliding Window+1
161. One Edit Distance	Solve	Medium	Facebook+2	String Two Pointers
165. Compare Version Numbers	Solve	Medium	Amazon+3	String Two Pointers
166. Fraction to Recurring Decimal	Solve	Medium	Airbnb+3	Hash Table Math+1
168. Excel Sheet Column Title	Solve	Easy	Adobe+24	Math String
171. Excel Sheet Column Number	Solve	Easy	Apple+2	Math String
179. Largest Number	Solve	Medium	Adobe+8	Array Greedy+2
186. Reverse Words in a String II	Solve	Medium	Microsoft	String Two Pointers
187. Repeated DNA Sequences	Solve	Medium	Amazon+1	Bit Manipulation Hash Function+4
205. Isomorphic Strings	Solve	Easy	Amazon+2	Hash Table String
208. Implement Trie (Prefix Tree)	Solve	Medium	Amazon+8	Design Hash Table+2