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
1984. Minimum Difference Between Highest and Lowest of K Scores	Solve	Easy	-	Array Sliding Window+1
1991. Find the Middle Index in Array	Solve	Easy	Facebook	Array Prefix Sum
1995. Count Special Quadruplets	Solve	Easy	-	Array Enumeration+1
2000. Reverse Prefix of Word	Solve	Easy	Optum	Stack String+1
2006. Count Number of Pairs With Absolute Difference K	Solve	Easy	Amazon	Array Counting+1
2011. Final Value of Variable After Performing Operations	Solve	Easy	Apple+1	Array Simulation+1
2016. Maximum Difference Between Increasing Elements	Solve	Easy	Apple+4	Array
2022. Convert 1D Array Into 2D Array	Solve	Easy	Google	Array Matrix+1
2026. Low-Quality Problems	Solve	Easy	-	Database
2027. Minimum Moves to Convert String	Solve	Easy	Jeavio	Greedy String
2032. Two Out of Three	Solve	Easy	Booking.com	Array Bit Manipulation+1
2037. Minimum Number of Moves to Seat Everyone	Solve	Easy	Adobe	Array Counting Sort+2
2042. Check if Numbers Are Ascending in a Sentence	Solve	Easy	Apple	String
2047. Number of Valid Words in a Sentence	Solve	Easy	Amazon	String
2053. Kth Distinct String in an Array	Solve	Easy	Amazon	Array Counting+2
2057. Smallest Index With Equal Value	Solve	Easy	Google	Array
2062. Count Vowel Substrings of a String	Solve	Easy	Commvault	Hash Table String
2068. Check Whether Two Strings are Almost Equivalent	Solve	Easy	Salesforce	Counting Hash Table+1
2072. The Winner University	Solve	Easy	Walmart Labs	Database
2073. Time Needed to Buy Tickets	Solve	Easy	Twitter	Array Queue+1
2078. Two Furthest Houses With Different Colors	Solve	Easy	Amazon	Array Greedy
2082. The Number of Rich Customers	Solve	Easy	Athenahealth	Database
2085. Count Common Words With One Occurrence	Solve	Easy	Jane Street	Array Counting+2
2089. Find Target Indices After Sorting Array	Solve	Easy	Facebook+1	Array Binary Search+1
2094. Finding 3-Digit Even Numbers	Solve	Easy	-	Array Enumeration+2
2099. Find Subsequence of Length K With the Largest Sum	Solve	Easy	Accenture	Array Hash Table+2
2103. Rings and Rods	Solve	Easy	Google	Hash Table String
2108. Find First Palindromic String in the Array	Solve	Easy	Amazon+1	Array String+1
2114. Maximum Number of Words Found in Sentences	Solve	Easy	Google	Array String
2119. A Number After a Double Reversal	Solve	Easy	-	Math
2124. Check if All A's Appears Before All B's	Solve	Easy	Microsoft	String
2129. Capitalize the Title	Solve	Easy	-	String
2133. Check if Every Row and Column Contains All Numbers	Solve	Easy	Instacart+1	Array Hash Table+1
2138. Divide a String Into Groups of Size k	Solve	Easy	Canonical	Simulation String
2144. Minimum Cost of Buying Candies With Discount	Solve	Easy	-	Array Greedy+1
2148. Count Elements With Strictly Smaller and Greater Elements	Solve	Easy	-	Array Counting+1
2154. Keep Multiplying Found Values by Two	Solve	Easy	Goldman Sachs	Array Hash Table+2
2160. Minimum Sum of Four Digit Number After Splitting Digits	Solve	Easy	Amazon	Greedy Math+1
2164. Sort Even and Odd Indices Independently	Solve	Easy	Zoho	Array Sorting
2169. Count Operations to Obtain Zero	Solve	Easy	payu	Math Simulation
2176. Count Equal and Divisible Pairs in an Array	Solve	Easy	zeta suite	Array
2180. Count Integers With Even Digit Sum	Solve	Easy	MindTree	Math Simulation
2185. Counting Words With a Given Prefix	Solve	Easy	Google	Array String+1
2190. Most Frequent Number Following Key In an Array	Solve	Easy	Google	Array Counting+1
2194. Cells in a Range on an Excel Sheet	Solve	Easy	Amazon	String
2200. Find All K-Distant Indices in an Array	Solve	Easy	Google	Array Two Pointers
2205. The Number of Users That Are Eligible for Discount	Solve	Easy	Analytics Quotient	Database
2206. Divide Array Into Equal Pairs	Solve	Easy	Microsoft	Array Bit Manipulation+2
2210. Count Hills and Valleys in an Array	Solve	Easy	Facebook	Array
2215. Find the Difference of Two Arrays	Solve	Easy	Google	Array Hash Table