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
3151. Special Array I	Solve	Easy	-	Array
3152. Special Array II	Solve	Medium	-	Array Binary Search+1
3153. Sum of Digit Differences of All Pairs	Solve	Medium	-	Array Counting+2
3154. Find Number of Ways to Reach the K-th Stair	Solve	Hard	-	Bit Manipulation Combinatorics+3
3155. Maximum Number of Upgradable Servers	Solve	Medium	-	Array Binary Search+1
3156. Employee Task Duration and Concurrent Tasks	Solve	Hard	-	Database
3157. Find the Level of Tree with Minimum Sum	Solve	Medium	-	Binary Tree Breadth-First Search+2
3158. Find the XOR of Numbers Which Appear Twice	Solve	Easy	-	Array Bit Manipulation+1
3159. Find Occurrences of an Element in an Array	Solve	Medium	-	Array Hash Table
3160. Find the Number of Distinct Colors Among the Balls	Solve	Medium	-	Array Hash Table+1
3161. Block Placement Queries	Solve	Hard	-	Array Binary Indexed Tree+2
3162. Find the Number of Good Pairs I	Solve	Easy	-	Array Hash Table
3163. String Compression III	Solve	Medium	-	String
3164. Find the Number of Good Pairs II	Solve	Medium	-	Array Hash Table
3165. Maximum Sum of Subsequence With Non-adjacent Elements	Solve	Hard	-	Array Divide and Conquer+2
3166. Calculate Parking Fees and Duration	Solve	Medium	-	Database
3167. Better Compression of String	Solve	Medium	-	Counting Hash Table+2
3168. Minimum Number of Chairs in a Waiting Room	Solve	Easy	-	Simulation String
3169. Count Days Without Meetings	Solve	Medium	-	Array Sorting
3170. Lexicographically Minimum String After Removing Stars	Solve	Medium	-	Greedy Hash Table+3
3171. Find Subarray With Bitwise OR Closest to K	Solve	Hard	-	Array Binary Search+2
3172. Second Day Verification	Solve	Easy	-	Database
3173. Bitwise OR of Adjacent Elements	Solve	Easy	-	Array Bit Manipulation
3174. Clear Digits	Solve	Easy	-	Simulation Stack+1
3175. Find The First Player to win K Games in a Row	Solve	Medium	-	Array Simulation
3176. Find the Maximum Length of a Good Subsequence I	Solve	Medium	-	Array Dynamic Programming+1
3177. Find the Maximum Length of a Good Subsequence II	Solve	Hard	-	Array Dynamic Programming+1
3178. Find the Child Who Has the Ball After K Seconds	Solve	Easy	-	Math Simulation
3179. Find the N-th Value After K Seconds	Solve	Medium	-	Array Combinatorics+3
3180. Maximum Total Reward Using Operations I	Solve	Medium	-	Array Dynamic Programming
3181. Maximum Total Reward Using Operations II	Solve	Hard	-	Array Bit Manipulation+1
3182. Find Top Scoring Students	Solve	Medium	-	Database
3183. The Number of Ways to Make the Sum	Solve	Medium	-	Array Dynamic Programming
3184. Count Pairs That Form a Complete Day I	Solve	Easy	-	Array Counting+1
3185. Count Pairs That Form a Complete Day II	Solve	Medium	-	Array Counting+1
3186. Maximum Total Damage With Spell Casting	Solve	Medium	-	Array Binary Search+5
3187. Peaks in Array	Solve	Hard	-	Array Binary Indexed Tree+1
3188. Find Top Scoring Students II	Solve	Hard	-	Database
3189. Minimum Moves to Get a Peaceful Board	Solve	Medium	-	Array Counting Sort+2
3190. Find Minimum Operations to Make All Elements Divisible by Three	Solve	Easy	-	Array Math
3191. Minimum Operations to Make Binary Array Elements Equal to One I	Solve	Medium	-	Array Bit Manipulation+3
3192. Minimum Operations to Make Binary Array Elements Equal to One II	Solve	Medium	-	Array Dynamic Programming+1
3193. Count the Number of Inversions	Solve	Hard	-	Array Dynamic Programming
3194. Minimum Average of Smallest and Largest Elements	Solve	Easy	-	Array Sorting+1
3195. Find the Minimum Area to Cover All Ones I	Solve	Medium	-	Array Matrix
3196. Maximize Total Cost of Alternating Subarrays	Solve	Medium	-	Array Dynamic Programming
3197. Find the Minimum Area to Cover All Ones II	Solve	Hard	-	Array Enumeration+1
3198. Find Cities in Each State	Solve	Easy	-	Database
3199. Count Triplets with Even XOR Set Bits I	Solve	Easy	-	Array Bit Manipulation
3200. Maximum Height of a Triangle	Solve	Easy	-	Array Enumeration