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
3101. Count Alternating Subarrays	Solve	Medium	-	Array Math
3102. Minimize Manhattan Distances	Solve	Hard	-	Array Geometry+3
3103. Find Trending Hashtags II	Solve	Hard	-	Database
3104. Find Longest Self-Contained Substring	Solve	Hard	-	Binary Search Hash Table+2
3105. Longest Strictly Increasing or Strictly Decreasing Subarray	Solve	Easy	-	Array
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
3108. Minimum Cost Walk in Weighted Graph	Solve	Hard	-	Array Bit Manipulation+2
3109. Find the Index of Permutation	Solve	Medium	-	Array Binary Indexed Tree+5
3110. Score of a String	Solve	Easy	-	String
3111. Minimum Rectangles to Cover Points	Solve	Medium	-	Array Greedy+1
3112. Minimum Time to Visit Disappearing Nodes	Solve	Medium	-	Array Graph+2
3113. Find the Number of Subarrays Where Boundary Elements Are Maximum	Solve	Hard	-	Array Binary Search+2
3114. Latest Time You Can Obtain After Replacing Characters	Solve	Easy	-	Enumeration String
3115. Maximum Prime Difference	Solve	Medium	-	Array Math+1
3116. Kth Smallest Amount With Single Denomination Combination	Solve	Hard	-	Array Binary Search+4
3117. Minimum Sum of Values by Dividing Array	Solve	Hard	-	Array Binary Search+4
3118. Friday Purchase III	Solve	Medium	-	Database
3119. Maximum Number of Potholes That Can Be Fixed	Solve	Medium	GEICO	Greedy Sorting+1
3120. Count the Number of Special Characters I	Solve	Easy	-	Hash Table String
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
3123. Find Edges in Shortest Paths	Solve	Hard	-	Breadth-First Search Depth-First Search+3
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
3127. Make a Square with the Same Color	Solve	Easy	-	Array Enumeration+1
3128. Right Triangles	Solve	Medium	-	Array Combinatorics+3
3129. Find All Possible Stable Binary Arrays I	Solve	Medium	-	Dynamic Programming Prefix Sum
3130. Find All Possible Stable Binary Arrays II	Solve	Hard	-	Dynamic Programming Prefix Sum
3131. Find the Integer Added to Array I	Solve	Easy	-	Array
3132. Find the Integer Added to Array II	Solve	Medium	-	Array Enumeration+2
3133. Minimum Array End	Solve	Medium	-	Bit Manipulation
3134. Find the Median of the Uniqueness Array	Solve	Hard	-	Array Binary Search+2
3135. Equalize Strings by Adding or Removing Characters at Ends	Solve	Medium	-	Binary Search Dynamic Programming+3
3136. Valid Word	Solve	Easy	-	String
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
3139. Minimum Cost to Equalize Array	Solve	Hard	-	Array Enumeration+1
3140. Consecutive Available Seats II	Solve	Medium	-	Database
3141. Maximum Hamming Distances	Solve	Hard	-	Array Bit Manipulation+1
3142. Check if Grid Satisfies Conditions	Solve	Easy	-	Array Matrix
3143. Maximum Points Inside the Square	Solve	Medium	-	Array Binary Search+3
3144. Minimum Substring Partition of Equal Character Frequency	Solve	Medium	-	Counting Dynamic Programming+2
3145. Find Products of Elements of Big Array	Solve	Hard	-	Array Binary Search+1
3146. Permutation Difference between Two Strings	Solve	Easy	-	Hash Table String
3147. Taking Maximum Energy From the Mystic Dungeon	Solve	Medium	-	Array Prefix Sum
3148. Maximum Difference Score in a Grid	Solve	Medium	-	Array Dynamic Programming+1
3149. Find the Minimum Cost Array Permutation	Solve	Hard	-	Array Bit Manipulation+2
3150. Invalid Tweets II	Solve	Easy	-	Database