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
3044. Most Frequent Prime	Solve	Medium	-	Array Counting+5
3047. Find the Largest Area of Square Inside Two Rectangles	Solve	Medium	-	Array Geometry+1
3048. Earliest Second to Mark Indices I	Solve	Medium	-	Array Binary Search
3050. Pizza Toppings Cost Analysis	Solve	Medium	-	Database
3054. Binary Tree Nodes	Solve	Medium	-	Database
3055. Top Percentile Fraud	Solve	Medium	-	Database
3056. Snaps Analysis	Solve	Medium	-	Database
3058. Friends With No Mutual Friends	Solve	Medium	-	Database
3064. Guess the Number Using Bitwise Questions I	Solve	Medium	-	Bit Manipulation Interactive
3066. Minimum Operations to Exceed Threshold Value II	Solve	Medium	-	Array Heap (Priority Queue)+1
3067. Count Pairs of Connectable Servers in a Weighted Tree Network	Solve	Medium	-	Array Depth-First Search+1
3070. Count Submatrices with Top-Left Element and Sum Less Than k	Solve	Medium	-	Array Matrix+1
3071. Minimum Operations to Write the Letter Y on a Grid	Solve	Medium	-	Array Counting+2
3073. Maximum Increasing Triplet Value	Solve	Medium	-	Array Ordered Set
3075. Maximize Happiness of Selected Children	Solve	Medium	-	Array Greedy+1
3076. Shortest Uncommon Substring in an Array	Solve	Medium	-	Array Hash Table+2
3078. Match Alphanumerical Pattern in Matrix I	Solve	Medium	-	Array Hash Table+2
3080. Mark Elements on Array by Performing Queries	Solve	Medium	-	Array Hash Table+3
3081. Replace Question Marks in String to Minimize Its Value	Solve	Medium	-	Counting Greedy+4
3084. Count Substrings Starting and Ending with Given Character	Solve	Medium	-	Counting Math+1
3085. Minimum Deletions to Make String K-Special	Solve	Medium	-	Counting Greedy+3
3087. Find Trending Hashtags	Solve	Medium	-	Database
3089. Find Bursty Behavior	Solve	Medium	-	Database
3091. Apply Operations to Make Sum of Array Greater Than or Equal to k	Solve	Medium	-	Enumeration Greedy+1
3092. Most Frequent IDs	Solve	Medium	-	Array Hash Table+2
3094. Guess the Number Using Bitwise Questions II	Solve	Medium	-	Bit Manipulation Interactive
3096. Minimum Levels to Gain More Points	Solve	Medium	-	Array Prefix Sum
3097. Shortest Subarray With OR at Least K II	Solve	Medium	-	Array Bit Manipulation+1
3100. Water Bottles II	Solve	Medium	-	Math Simulation
3101. Count Alternating Subarrays	Solve	Medium	-	Array Math
3106. Lexicographically Smallest String After Operations With Constraint	Solve	Medium	-	Greedy String
3107. Minimum Operations to Make Median of Array Equal to K	Solve	Medium	-	Array Greedy+1
3109. Find the Index of Permutation	Solve	Medium	-	Array Binary Indexed Tree+5
3111. Minimum Rectangles to Cover Points	Solve	Medium	-	Array Greedy+1
3112. Minimum Time to Visit Disappearing Nodes	Solve	Medium	-	Array Graph+2
3115. Maximum Prime Difference	Solve	Medium	-	Array Math+1
3118. Friday Purchase III	Solve	Medium	-	Database
3119. Maximum Number of Potholes That Can Be Fixed	Solve	Medium	GEICO	Greedy Sorting+1
3121. Count the Number of Special Characters II	Solve	Medium	-	Hash Table String
3122. Minimum Number of Operations to Satisfy Conditions	Solve	Medium	-	Array Dynamic Programming+1
3124. Find Longest Calls	Solve	Medium	-	Database
3125. Maximum Number That Makes Result of Bitwise AND Zero	Solve	Medium	-	Greedy Sorting+1
3126. Server Utilization Time	Solve	Medium	-	Database
3128. Right Triangles	Solve	Medium	-	Array Combinatorics+3
3129. Find All Possible Stable Binary Arrays I	Solve	Medium	-	Dynamic Programming Prefix Sum
3132. Find the Integer Added to Array II	Solve	Medium	-	Array Enumeration+2
3133. Minimum Array End	Solve	Medium	-	Bit Manipulation
3135. Equalize Strings by Adding or Removing Characters at Ends	Solve	Medium	-	Binary Search Dynamic Programming+3
3137. Minimum Number of Operations to Make Word K-Periodic	Solve	Medium	-	Counting Hash Table+1
3138. Minimum Length of Anagram Concatenation	Solve	Medium	-	Counting Hash Table+1