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
951. Flip Equivalent Binary Trees	Solve	Medium	Google	Binary Tree Depth-First Search+1
952. Largest Component Size by Common Factor	Solve	Hard	Google	Array Hash Table+3
953. Verifying an Alien Dictionary	Solve	Easy	Amazon+3	Array Hash Table+1
954. Array of Doubled Pairs	Solve	Medium	Google	Array Greedy+2
955. Delete Columns to Make Sorted II	Solve	Medium	Google	Array Greedy+1
956. Tallest Billboard	Solve	Hard	-	Array Dynamic Programming
957. Prison Cells After N Days	Solve	Medium	SAP	Array Bit Manipulation+2
958. Check Completeness of a Binary Tree	Solve	Medium	Facebook	Binary Tree Breadth-First Search+1
959. Regions Cut By Slashes	Solve	Medium	Amazon+1	Array Breadth-First Search+4
960. Delete Columns to Make Sorted III	Solve	Hard	Google	Array Dynamic Programming+1
961. N-Repeated Element in Size 2N Array	Solve	Easy	Akamai	Array Hash Table
962. Maximum Width Ramp	Solve	Medium	Amazon+1	Array Monotonic Stack+1
963. Minimum Area Rectangle II	Solve	Medium	Google	Array Geometry+1
964. Least Operators to Express Number	Solve	Hard	Snapchat	Dynamic Programming Math+1
965. Univalued Binary Tree	Solve	Easy	Google	Binary Tree Breadth-First Search+2
966. Vowel Spellchecker	Solve	Medium	Thumbtack	Array Hash Table+1
967. Numbers With Same Consecutive Differences	Solve	Medium	Adobe+6	Backtracking Breadth-First Search
968. Binary Tree Cameras	Solve	Hard	Amazon+7	Binary Tree Depth-First Search+2
969. Pancake Sorting	Solve	Medium	Amazon+1	Array Greedy+2
970. Powerful Integers	Solve	Medium	Amazon	Enumeration Hash Table+1
971. Flip Binary Tree To Match Preorder Traversal	Solve	Medium	Amazon	Binary Tree Depth-First Search+1
972. Equal Rational Numbers	Solve	Hard	Microsoft	Math String
973. K Closest Points to Origin	Solve	Medium	Amazon+6	Array Divide and Conquer+5
974. Subarray Sums Divisible by K	Solve	Medium	Amazon+3	Array Hash Table+1
975. Odd Even Jump	Solve	Hard	Google+1	Array Dynamic Programming+3
976. Largest Perimeter Triangle	Solve	Easy	Tesla	Array Greedy+2
977. Squares of a Sorted Array	Solve	Easy	Amazon+4	Array Sorting+1
978. Longest Turbulent Subarray	Solve	Medium	-	Array Dynamic Programming+1
979. Distribute Coins in Binary Tree	Solve	Medium	Amazon+3	Binary Tree Depth-First Search+1
980. Unique Paths III	Solve	Hard	Amazon+1	Array Backtracking+2
981. Time Based Key-Value Store	Solve	Medium	Amazon+5	Binary Search Design+2
982. Triples with Bitwise AND Equal To Zero	Solve	Hard	Flipkart	Array Bit Manipulation+1
983. Minimum Cost For Tickets	Solve	Medium	Google	Array Dynamic Programming
984. String Without AAA or BBB	Solve	Medium	Zalando	Greedy String
985. Sum of Even Numbers After Queries	Solve	Medium	Indeed	Array Simulation
986. Interval List Intersections	Solve	Medium	Amazon+7	Array Two Pointers
987. Vertical Order Traversal of a Binary Tree	Solve	Hard	Amazon+4	Binary Tree Breadth-First Search+4
988. Smallest String Starting From Leaf	Solve	Medium	Apple	Backtracking Binary Tree+3
989. Add to Array-Form of Integer	Solve	Easy	Facebook	Array Math
990. Satisfiability of Equality Equations	Solve	Medium	Amazon+4	Array Graph+2
991. Broken Calculator	Solve	Medium	Arcesium	Greedy Math
992. Subarrays with K Different Integers	Solve	Hard	Adobe+10	Array Counting+2
993. Cousins in Binary Tree	Solve	Easy	Amazon+2	Binary Tree Breadth-First Search+2
994. Rotting Oranges	Solve	Medium	Amazon+3	Array Breadth-First Search+1
995. Minimum Number of K Consecutive Bit Flips	Solve	Hard	Akuna Capital+1	Array Bit Manipulation+3
996. Number of Squareful Arrays	Solve	Hard	Apple+1	Array Backtracking+5
997. Find the Town Judge	Solve	Easy	Adobe+3	Array Graph+1
998. Maximum Binary Tree II	Solve	Medium	Facebook	Binary Tree Tree
999. Available Captures for Rook	Solve	Easy	Square	Array Matrix+1
1000. Minimum Cost to Merge Stones	Solve	Hard	Amazon+3	Array Dynamic Programming+1