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
981. Time Based Key-Value Store	Solve	Medium	Amazon+5	Binary Search Design+2
984. String Without AAA or BBB	Solve	Medium	Zalando	Greedy String
988. Smallest String Starting From Leaf	Solve	Medium	Apple	Backtracking Binary Tree+3
990. Satisfiability of Equality Equations	Solve	Medium	Amazon+4	Array Graph+2
1002. Find Common Characters	Solve	Easy	Amazon	Array Hash Table+1
1003. Check If Word Is Valid After Substitutions	Solve	Medium	Nutanix	Stack String
1016. Binary String With Substrings Representing 1 To N	Solve	Medium	Amazon+1	String
1021. Remove Outermost Parentheses	Solve	Easy	Microsoft	Stack String
1023. Camelcase Matching	Solve	Medium	Amazon+1	Array String+3
1028. Recover a Tree From Preorder Traversal	Solve	Hard	Amazon+2	Binary Tree Depth-First Search+2
1032. Stream of Characters	Solve	Hard	Amazon+3	Array Data Stream+3
1041. Robot Bounded In Circle	Solve	Medium	Adobe+6	Math Simulation+1
1044. Longest Duplicate Substring	Solve	Hard	-	Binary Search Hash Function+4
1047. Remove All Adjacent Duplicates In String	Solve	Easy	Amazon+1	Stack String
1048. Longest String Chain	Solve	Medium	Facebook+4	Array Dynamic Programming+4
1055. Shortest Way to Form String	Solve	Medium	Facebook+2	Binary Search Greedy+2
1058. Minimize Rounding Error to Meet Target	Solve	Medium	Airbnb	Array Greedy+3
1061. Lexicographically Smallest Equivalent String	Solve	Medium	Apple	String Union Find
1062. Longest Repeating Substring	Solve	Medium	VMware	Binary Search Dynamic Programming+4
1065. Index Pairs of a String	Solve	Easy	Amazon	Array Sorting+2
1071. Greatest Common Divisor of Strings	Solve	Easy	Atlassian+1	Math String
1078. Occurrences After Bigram	Solve	Easy	Google	String
1079. Letter Tile Possibilities	Solve	Medium	Google+1	Backtracking Counting+2
1081. Smallest Subsequence of Distinct Characters	Solve	Medium	Amazon+4	Greedy Monotonic Stack+2
1087. Brace Expansion	Solve	Medium	Amazon+1	Backtracking Breadth-First Search+1
1092. Shortest Common Supersequence	Solve	Hard	Amazon+4	Dynamic Programming String
1096. Brace Expansion II	Solve	Hard	Google	Backtracking Breadth-First Search+2
1100. Find K-Length Substrings With No Repeated Characters	Solve	Medium	Amazon	Hash Table Sliding Window+1
1106. Parsing A Boolean Expression	Solve	Hard	Affinity+1	Recursion Stack+1
1108. Defanging an IP Address	Solve	Easy	Amazon+1	String
1111. Maximum Nesting Depth of Two Valid Parentheses Strings	Solve	Medium	Bloomreach	Stack String
1119. Remove Vowels from a String	Solve	Easy	Amazon	String
1138. Alphabet Board Path	Solve	Medium	Amazon	Hash Table String
1143. Longest Common Subsequence	Solve	Medium	Amazon+3	Dynamic Programming String
1147. Longest Chunked Palindrome Decomposition	Solve	Hard	Google	Dynamic Programming Greedy+4
1153. String Transforms Into Another String	Solve	Hard	Amazon+4	Hash Table String
1154. Day of the Year	Solve	Easy	ZScaler	Math String
1156. Swap For Longest Repeated Character Substring	Solve	Medium	Microsoft+1	Hash Table Sliding Window+1
1160. Find Words That Can Be Formed by Characters	Solve	Easy	Amazon+3	Array Counting+2
1163. Last Substring in Lexicographical Order	Solve	Hard	Mathworks	String Two Pointers
1165. Single-Row Keyboard	Solve	Easy	Google	Hash Table String
1166. Design File System	Solve	Medium	Google	Design Hash Table+2
1169. Invalid Transactions	Solve	Medium	Amazon+2	Array Hash Table+2
1170. Compare Strings by Frequency of the Smallest Character	Solve	Medium	Google	Array Binary Search+3
1177. Can Make Palindrome from Substring	Solve	Medium	Akuna Capital	Array Bit Manipulation+3
1178. Number of Valid Words for Each Puzzle	Solve	Hard	Dropbox	Array Bit Manipulation+3
1180. Count Substrings with Only One Distinct Letter	Solve	Easy	Virtu Financial	Math String
1181. Before and After Puzzle	Solve	Medium	Clutter	Array Hash Table+2
1189. Maximum Number of Balloons	Solve	Easy	Adobe	Counting Hash Table+1
1190. Reverse Substrings Between Each Pair of Parentheses	Solve	Medium	Microsoft+1	Stack String