Dashboard Questions Topics Companies Sheets

Data Structures & Algorithms

Practice 3,374+ coding problems from top companies. Master DSA concepts and ace your interviews.

3,374

Problems

840

Easy

1762

Medium

772

Hard

Difficulty

All3374 Easy840 Medium1762 Hard772

Title	Solve	Difficulty	Companies	Topics
1051. Height Checker	Solve	Easy	Apple+2	Array Counting Sort+1
1052. Grumpy Bookstore Owner	Solve	Medium	EPAM Systems+3	Array Sliding Window
1053. Previous Permutation With One Swap	Solve	Medium	Microsoft	Array Greedy
1054. Distant Barcodes	Solve	Medium	Amazon	Array Counting+4
1055. Shortest Way to Form String	Solve	Medium	Facebook+2	Binary Search Greedy+2
1056. Confusing Number	Solve	Easy	Google	Math
1057. Campus Bikes	Solve	Medium	Amazon	Array Greedy+1
1058. Minimize Rounding Error to Meet Target	Solve	Medium	Airbnb	Array Greedy+3
1059. All Paths from Source Lead to Destination	Solve	Medium	Google	Graph Topological Sort
1060. Missing Element in Sorted Array	Solve	Medium	Amazon+2	Array Binary Search
1061. Lexicographically Smallest Equivalent String	Solve	Medium	Apple	String Union Find
1062. Longest Repeating Substring	Solve	Medium	VMware	Binary Search Dynamic Programming+4
1063. Number of Valid Subarrays	Solve	Hard	Amazon+1	Array Monotonic Stack+1
1064. Fixed Point	Solve	Easy	Qualtrics	Array Binary Search
1065. Index Pairs of a String	Solve	Easy	Amazon	Array Sorting+2
1066. Campus Bikes II	Solve	Medium	Amazon+1	Array Backtracking+3
1067. Digit Count in Range	Solve	Hard	Amazon	Dynamic Programming Math
1068. Product Sales Analysis I	Solve	Easy	Adobe+2	Database
1069. Product Sales Analysis II	Solve	Easy	Amazon	Database
1070. Product Sales Analysis III	Solve	Medium	Amazon	Database
1071. Greatest Common Divisor of Strings	Solve	Easy	Atlassian+1	Math String
1072. Flip Columns For Maximum Number of Equal Rows	Solve	Medium	-	Array Hash Table+1
1073. Adding Two Negabinary Numbers	Solve	Medium	Grab	Array Math
1074. Number of Submatrices That Sum to Target	Solve	Hard	Amazon+2	Array Hash Table+2
1075. Project Employees I	Solve	Easy	Amazon+1	Database
1076. Project Employees II	Solve	Easy	Facebook	Database
1077. Project Employees III	Solve	Medium	Facebook	Database
1078. Occurrences After Bigram	Solve	Easy	Google	String
1079. Letter Tile Possibilities	Solve	Medium	Google+1	Backtracking Counting+2
1080. Insufficient Nodes in Root to Leaf Paths	Solve	Medium	Amazon	Binary Tree Depth-First Search+1
1081. Smallest Subsequence of Distinct Characters	Solve	Medium	Amazon+4	Greedy Monotonic Stack+2
1082. Sales Analysis I	Solve	Easy	Amazon	Database
1083. Sales Analysis II	Solve	Easy	Amazon	Database
1084. Sales Analysis III	Solve	Easy	Amazon	Database
1085. Sum of Digits in the Minimum Number	Solve	Easy	Amazon	Array Math
1086. High Five	Solve	Easy	Goldman Sachs	Array Hash Table+2
1087. Brace Expansion	Solve	Medium	Amazon+1	Backtracking Breadth-First Search+1
1088. Confusing Number II	Solve	Hard	Google	Backtracking Math
1089. Duplicate Zeros	Solve	Easy	Amazon+1	Array Two Pointers
1090. Largest Values From Labels	Solve	Medium	Google	Array Counting+3
1091. Shortest Path in Binary Matrix	Solve	Medium	Adobe+20	Array Breadth-First Search+1
1092. Shortest Common Supersequence	Solve	Hard	Amazon+4	Dynamic Programming String
1093. Statistics from a Large Sample	Solve	Medium	Microsoft	Array Math+1
1094. Car Pooling	Solve	Medium	Amazon+7	Array Heap (Priority Queue)+3
1095. Find in Mountain Array	Solve	Hard	Adobe+8	Array Binary Search+1
1096. Brace Expansion II	Solve	Hard	Google	Backtracking Breadth-First Search+2
1097. Game Play Analysis V	Solve	Hard	GSN Games	Database
1098. Unpopular Books	Solve	Medium	-	Database
1099. Two Sum Less Than K	Solve	Easy	Amazon+3	Array Binary Search+2
1100. Find K-Length Substrings With No Repeated Characters	Solve	Medium	Amazon	Hash Table Sliding Window+1