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
2001. Number of Pairs of Interchangeable Rectangles	Solve	Medium	-	Array Counting+3
2002. Maximum Product of the Length of Two Palindromic Subsequences	Solve	Medium	Ascend+2	Backtracking Bit Manipulation+3
2003. Smallest Missing Genetic Value in Each Subtree	Solve	Hard	Codenation	Depth-First Search Dynamic Programming+2
2004. The Number of Seniors and Juniors to Join the Company	Solve	Hard	Apple	Database
2005. Subtree Removal Game with Fibonacci Tree	Solve	Hard	Sony	Binary Tree Dynamic Programming+3
2006. Count Number of Pairs With Absolute Difference K	Solve	Easy	Amazon	Array Counting+1
2007. Find Original Array From Doubled Array	Solve	Medium	Google+1	Array Greedy+2
2008. Maximum Earnings From Taxi	Solve	Medium	Apple+2	Array Binary Search+3
2009. Minimum Number of Operations to Make Array Continuous	Solve	Hard	Amazon+3	Array Binary Search+2
2010. The Number of Seniors and Juniors to Join the Company II	Solve	Hard	-	Database
2011. Final Value of Variable After Performing Operations	Solve	Easy	Apple+1	Array Simulation+1
2012. Sum of Beauty in the Array	Solve	Medium	Amazon	Array
2013. Detect Squares	Solve	Medium	Amazon+1	Array Counting+2
2014. Longest Subsequence Repeated k Times	Solve	Hard	Facebook	Backtracking Counting+3
2015. Average Height of Buildings in Each Segment	Solve	Medium	Microsoft	Array Greedy+2
2016. Maximum Difference Between Increasing Elements	Solve	Easy	Apple+4	Array
2017. Grid Game	Solve	Medium	T System	Array Matrix+1
2018. Check if Word Can Be Placed In Crossword	Solve	Medium	Google	Array Enumeration+1
2019. The Score of Students Solving Math Expression	Solve	Hard	Flipkart	Array Dynamic Programming+4
2020. Number of Accounts That Did Not Stream	Solve	Medium	Warnermedia	Database
2021. Brightest Position on Street	Solve	Medium	Robinhood	Array Ordered Set+1
2022. Convert 1D Array Into 2D Array	Solve	Easy	Google	Array Matrix+1
2023. Number of Pairs of Strings With Concatenation Equal to Target	Solve	Medium	Facebook	Array Counting+2
2024. Maximize the Confusion of an Exam	Solve	Medium	Amazon+2	Binary Search Prefix Sum+2
2025. Maximum Number of Ways to Partition an Array	Solve	Hard	Google	Array Counting+3
2026. Low-Quality Problems	Solve	Easy	-	Database
2027. Minimum Moves to Convert String	Solve	Easy	Jeavio	Greedy String
2028. Find Missing Observations	Solve	Medium	Microsoft	Array Math+1
2029. Stone Game IX	Solve	Medium	Samsung	Array Counting+3
2030. Smallest K-Length Subsequence With Occurrences of a Letter	Solve	Hard	Deutsche Bank	Greedy Monotonic Stack+2
2031. Count Subarrays With More Ones Than Zeros	Solve	Medium	Google	Array Binary Indexed Tree+5
2032. Two Out of Three	Solve	Easy	Booking.com	Array Bit Manipulation+1
2033. Minimum Operations to Make a Uni-Value Grid	Solve	Medium	Facebook	Array Math+2
2034. Stock Price Fluctuation	Solve	Medium	Google	Data Stream Design+3
2035. Partition Array Into Two Arrays to Minimize Sum Difference	Solve	Hard	Adobe+10	Array Binary Search+5
2036. Maximum Alternating Subarray Sum	Solve	Medium	Amazon	Array Dynamic Programming
2037. Minimum Number of Moves to Seat Everyone	Solve	Easy	Adobe	Array Counting Sort+2
2038. Remove Colored Pieces if Both Neighbors are the Same Color	Solve	Medium	JPMorgan+2	Game Theory Greedy+2
2039. The Time When the Network Becomes Idle	Solve	Medium	Deutsche Bank	Array Breadth-First Search+1
2040. Kth Smallest Product of Two Sorted Arrays	Solve	Hard	LinkedIn	Array Binary Search
2041. Accepted Candidates From the Interviews	Solve	Medium	-	Database
2042. Check if Numbers Are Ascending in a Sentence	Solve	Easy	Apple	String
2043. Simple Bank System	Solve	Medium	PhonePe	Array Design+2
2044. Count Number of Maximum Bitwise-OR Subsets	Solve	Medium	-	Array Backtracking+2
2045. Second Minimum Time to Reach Destination	Solve	Hard	-	Breadth-First Search Graph+1
2046. Sort Linked List Already Sorted Using Absolute Values	Solve	Medium	-	Linked List Sorting+1
2047. Number of Valid Words in a Sentence	Solve	Easy	Amazon	String
2048. Next Greater Numerically Balanced Number	Solve	Medium	Sprinklr	Backtracking Enumeration+1
2049. Count Nodes With the Highest Score	Solve	Medium	Amazon+2	Array Binary Tree+2
2050. Parallel Courses III	Solve	Hard	Google+1	Array Dynamic Programming+2