readme.md

Question	Free?	Status	Difficulty	Topics	Similar Questions
801. Minimum Swaps To Make Sequences Increasing  🔗  📝	🆓		⭐️⭐️⭐️	Array  🔗 Dynamic Programming  🔗	2111. Minimum Operations to Make the Array K-Increasing  🔗  📝
802. Find Eventual Safe States  🔗  📝	🆓		⭐️⭐️	Depth-First Search  🔗 Breadth-First Search  🔗 Graph  🔗 Topological Sort  🔗
803. Bricks Falling When Hit  🔗  📝	🆓		⭐️⭐️⭐️	Array  🔗 Union Find  🔗 Matrix  🔗	1970. Last Day Where You Can Still Cross  🔗  📝 2184. Number of Ways to Build Sturdy Brick Wall  🔗  📝
804. Unique Morse Code Words  🔗  📝	🆓	✅	⭐️	Array  🔗 Hash Table  🔗 String  🔗
805. Split Array With Same Average  🔗  📝	🆓		⭐️⭐️⭐️	Array  🔗 Math  🔗 Dynamic Programming  🔗 Bit Manipulation  🔗 Bitmask  🔗	2035. Partition Array Into Two Arrays to Minimize Sum Difference  🔗  📝 2256. Minimum Average Difference  🔗  📝
806. Number of Lines To Write String  🔗  📝	🆓		⭐️	Array  🔗 String  🔗
807. Max Increase to Keep City Skyline  🔗  📝	🆓		⭐️⭐️	Array  🔗 Greedy  🔗 Matrix  🔗
808. Soup Servings  🔗  📝	🆓		⭐️⭐️	Math  🔗 Dynamic Programming  🔗 Probability and Statistics  🔗
809. Expressive Words  🔗  📝	🆓		⭐️⭐️	Array  🔗 Two Pointers  🔗 String  🔗
810. Chalkboard XOR Game  🔗  📝	🆓		⭐️⭐️⭐️	Array  🔗 Math  🔗 Bit Manipulation  🔗 Brainteaser  🔗 Game Theory  🔗
811. Subdomain Visit Count  🔗  📝	🆓	✅	⭐️⭐️	Array  🔗 Hash Table  🔗 String  🔗 Counting  🔗
812. Largest Triangle Area  🔗  📝	🆓		⭐️	Array  🔗 Math  🔗 Geometry  🔗	976. Largest Perimeter Triangle  🔗  📝
813. Largest Sum of Averages  🔗  📝	🆓		⭐️⭐️	Array  🔗 Dynamic Programming  🔗
814. Binary Tree Pruning  🔗  📝	🆓		⭐️⭐️	Tree  🔗 Depth-First Search  🔗 Binary Tree  🔗
815. Bus Routes  🔗  📝	🆓		⭐️⭐️⭐️	Array  🔗 Hash Table  🔗 Breadth-First Search  🔗	2361. Minimum Costs Using the Train Line  🔗  📝
816. Ambiguous Coordinates  🔗  📝	🆓		⭐️⭐️	String  🔗 Backtracking  🔗
817. Linked List Components  🔗  📝	🆓	✅	⭐️⭐️	Hash Table  🔗 Linked List  🔗	2181. Merge Nodes in Between Zeros  🔗  📝
818. Race Car  🔗  📝	🆓		⭐️⭐️⭐️	Dynamic Programming  🔗
819. Most Common Word  🔗  📝	🆓		⭐️	Hash Table  🔗 String  🔗 Counting  🔗
820. Short Encoding of Words  🔗  📝	🆓		⭐️⭐️	Array  🔗 Hash Table  🔗 String  🔗 Trie  🔗
821. Shortest Distance to a Character  🔗  📝	🆓		⭐️	Array  🔗 Two Pointers  🔗 String  🔗
822. Card Flipping Game  🔗  📝	🆓		⭐️⭐️	Array  🔗 Hash Table  🔗
823. Binary Trees With Factors  🔗  📝	🆓		⭐️⭐️	Array  🔗 Hash Table  🔗 Dynamic Programming  🔗
824. Goat Latin  🔗  📝	🆓		⭐️	String  🔗
825. Friends Of Appropriate Ages  🔗  📝	🆓		⭐️⭐️	Array  🔗 Two Pointers  🔗 Binary Search  🔗 Sorting  🔗
826. Most Profit Assigning Work  🔗  📝	🆓		⭐️⭐️	Array  🔗 Two Pointers  🔗 Binary Search  🔗 Greedy  🔗 Sorting  🔗	2071. Maximum Number of Tasks You Can Assign  🔗  📝 2300. Successful Pairs of Spells and Potions  🔗  📝
827. Making A Large Island  🔗  📝	🆓		⭐️⭐️⭐️	Array  🔗 Depth-First Search  🔗 Breadth-First Search  🔗 Union Find  🔗 Matrix  🔗
828. Count Unique Characters of All Substrings of a Given String  🔗  📝	🆓		⭐️⭐️⭐️	Hash Table  🔗 String  🔗 Dynamic Programming  🔗	2262. Total Appeal of A String  🔗  📝
829. Consecutive Numbers Sum  🔗  📝	🆓		⭐️⭐️⭐️	Math  🔗 Enumeration  🔗
830. Positions of Large Groups  🔗  📝	🆓	✅	⭐️	String  🔗	2138. Divide a String Into Groups of Size k  🔗  📝
831. Masking Personal Information  🔗  📝	🆓		⭐️⭐️	String  🔗
832. Flipping an Image  🔗  📝	🆓		⭐️	Array  🔗 Two Pointers  🔗 Matrix  🔗 Simulation  🔗
833. Find And Replace in String  🔗  📝	🆓		⭐️⭐️	Array  🔗 String  🔗 Sorting  🔗
834. Sum of Distances in Tree  🔗  📝	🆓		⭐️⭐️⭐️	Dynamic Programming  🔗 Tree  🔗 Depth-First Search  🔗 Graph  🔗	979. Distribute Coins in Binary Tree  🔗  📝 2049. Count Nodes With the Highest Score  🔗  📝
835. Image Overlap  🔗  📝	🆓		⭐️⭐️	Array  🔗 Matrix  🔗
836. Rectangle Overlap  🔗  📝	🆓		⭐️	Math  🔗 Geometry  🔗	223. Rectangle Area  🔗  📝
837. New 21 Game  🔗  📝	🆓		⭐️⭐️	Math  🔗 Dynamic Programming  🔗 Sliding Window  🔗 Probability and Statistics  🔗
838. Push Dominoes  🔗  📝	🆓		⭐️⭐️	Two Pointers  🔗 String  🔗 Dynamic Programming  🔗
839. Similar String Groups  🔗  📝	🆓		⭐️⭐️⭐️	Array  🔗 String  🔗 Depth-First Search  🔗 Breadth-First Search  🔗 Union Find  🔗	2157. Groups of Strings  🔗  📝
840. Magic Squares In Grid  🔗  📝	🆓		⭐️⭐️	Array  🔗 Math  🔗 Matrix  🔗	1895. Largest Magic Square  🔗  📝
841. Keys and Rooms  🔗  📝	🆓	✅	⭐️⭐️	Depth-First Search  🔗 Breadth-First Search  🔗 Graph  🔗	261. Graph Valid Tree  🔗  📝
842. Split Array into Fibonacci Sequence  🔗  📝	🆓		⭐️⭐️	String  🔗 Backtracking  🔗	306. Additive Number  🔗  📝 509. Fibonacci Number  🔗  📝
843. Guess the Word  🔗  📝	🆓	👀	⭐️⭐️⭐️	Array  🔗 Math  🔗 String  🔗 Interactive  🔗 Game Theory  🔗
844. Backspace String Compare  🔗  📝	🆓		⭐️	Two Pointers  🔗 String  🔗 Stack  🔗 Simulation  🔗	1598. Crawler Log Folder  🔗  📝
845. Longest Mountain in Array  🔗  📝	🆓		⭐️⭐️	Array  🔗 Two Pointers  🔗 Dynamic Programming  🔗 Enumeration  🔗	1671. Minimum Number of Removals to Make Mountain Array  🔗  📝 2100. Find Good Days to Rob the Bank  🔗  📝
846. Hand of Straights  🔗  📝	🆓		⭐️⭐️	Array  🔗 Hash Table  🔗 Greedy  🔗 Sorting  🔗
847. Shortest Path Visiting All Nodes  🔗  📝	🆓		⭐️⭐️⭐️	Dynamic Programming  🔗 Bit Manipulation  🔗 Breadth-First Search  🔗 Graph  🔗 Bitmask  🔗
848. Shifting Letters  🔗  📝	🆓		⭐️⭐️	Array  🔗 String  🔗	1844. Replace All Digits with Characters  🔗  📝
849. Maximize Distance to Closest Person  🔗  📝	🆓	✅	⭐️⭐️	Array  🔗	855. Exam Room  🔗  📝 2365. Task Scheduler II  🔗  📝
850. Rectangle Area II  🔗  📝	🆓	👀	⭐️⭐️⭐️	Array  🔗 Segment Tree  🔗 Line Sweep  🔗 Ordered Set  🔗
851. Loud and Rich  🔗  📝	🆓		⭐️⭐️	Array  🔗 Depth-First Search  🔗 Graph  🔗 Topological Sort  🔗
852. Peak Index in a Mountain Array  🔗  📝	🆓	✅	⭐️⭐️	Array  🔗 Binary Search  🔗	162. Find Peak Element  🔗  📝 1095. Find in Mountain Array  🔗  📝 1671. Minimum Number of Removals to Make Mountain Array  🔗  📝
853. Car Fleet  🔗  📝	🆓		⭐️⭐️	Array  🔗 Stack  🔗 Sorting  🔗 Monotonic Stack  🔗	1776. Car Fleet II  🔗  📝 2211. Count Collisions on a Road  🔗  📝
854. K-Similar Strings  🔗  📝	🆓		⭐️⭐️⭐️	String  🔗 Breadth-First Search  🔗	765. Couples Holding Hands  🔗  📝
855. Exam Room  🔗  📝	🆓	👀	⭐️⭐️	Design  🔗 Ordered Set  🔗	849. Maximize Distance to Closest Person  🔗  📝
856. Score of Parentheses  🔗  📝	🆓	✅	⭐️⭐️	String  🔗 Stack  🔗
857. Minimum Cost to Hire K Workers  🔗  📝	🆓		⭐️⭐️⭐️	Array  🔗 Greedy  🔗 Sorting  🔗 Heap (Priority Queue)  🔗
858. Mirror Reflection  🔗  📝	🆓		⭐️⭐️	Math  🔗 Geometry  🔗
859. Buddy Strings  🔗  📝	🆓	✅	⭐️	Hash Table  🔗 String  🔗	1657. Determine if Two Strings Are Close  🔗  📝 1790. Check if One String Swap Can Make Strings Equal  🔗  📝
860. Lemonade Change  🔗  📝	🆓		⭐️	Array  🔗 Greedy  🔗
861. Score After Flipping Matrix  🔗  📝	🆓		⭐️⭐️	Array  🔗 Greedy  🔗 Bit Manipulation  🔗 Matrix  🔗	2128. Remove All Ones With Row and Column Flips  🔗  📝
862. Shortest Subarray with Sum at Least K  🔗  📝	🆓		⭐️⭐️⭐️	Array  🔗 Binary Search  🔗 Queue  🔗 Sliding Window  🔗 Heap (Priority Queue)  🔗 Prefix Sum  🔗 Monotonic Queue  🔗
863. All Nodes Distance K in Binary Tree  🔗  📝	🆓	✅	⭐️⭐️	Tree  🔗 Depth-First Search  🔗 Breadth-First Search  🔗 Binary Tree  🔗
864. Shortest Path to Get All Keys  🔗  📝	🆓		⭐️⭐️⭐️	Bit Manipulation  🔗 Breadth-First Search  🔗
865. Smallest Subtree with all the Deepest Nodes  🔗  📝	🆓	✅	⭐️⭐️	Hash Table  🔗 Tree  🔗 Depth-First Search  🔗 Breadth-First Search  🔗 Binary Tree  🔗
866. Prime Palindrome  🔗  📝	🆓		⭐️⭐️	Math  🔗	2081. Sum of k-Mirror Numbers  🔗  📝
867. Transpose Matrix  🔗  📝	🆓		⭐️	Array  🔗 Matrix  🔗 Simulation  🔗
868. Binary Gap  🔗  📝	🆓		⭐️	Bit Manipulation  🔗
869. Reordered Power of 2  🔗  📝	🆓		⭐️⭐️	Math  🔗 Sorting  🔗 Counting  🔗 Enumeration  🔗
870. Advantage Shuffle  🔗  📝	🆓		⭐️⭐️	Array  🔗 Greedy  🔗 Sorting  🔗
871. Minimum Number of Refueling Stops  🔗  📝	🆓		⭐️⭐️⭐️	Array  🔗 Dynamic Programming  🔗 Greedy  🔗 Heap (Priority Queue)  🔗
872. Leaf-Similar Trees  🔗  📝	🆓	✅	⭐️	Tree  🔗 Depth-First Search  🔗 Binary Tree  🔗
873. Length of Longest Fibonacci Subsequence  🔗  📝	🆓		⭐️⭐️	Array  🔗 Hash Table  🔗 Dynamic Programming  🔗	509. Fibonacci Number  🔗  📝
874. Walking Robot Simulation  🔗  📝	🆓		⭐️⭐️	Array  🔗 Simulation  🔗	2069. Walking Robot Simulation II  🔗  📝
875. Koko Eating Bananas  🔗  📝	🆓		⭐️⭐️	Array  🔗 Binary Search  🔗	774. Minimize Max Distance to Gas Station  🔗  📝 2064. Minimized Maximum of Products Distributed to Any Store  🔗  📝 2226. Maximum Candies Allocated to K Children  🔗  📝
876. Middle of the Linked List  🔗  📝	🆓	✅	⭐️	Linked List  🔗 Two Pointers  🔗	2095. Delete the Middle Node of a Linked List  🔗  📝 2130. Maximum Twin Sum of a Linked List  🔗  📝
877. Stone Game  🔗  📝	🆓		⭐️⭐️	Array  🔗 Math  🔗 Dynamic Programming  🔗 Game Theory  🔗	1563. Stone Game V  🔗  📝 1686. Stone Game VI  🔗  📝 1690. Stone Game VII  🔗  📝 1872. Stone Game VIII  🔗  📝 2029. Stone Game IX  🔗  📝
878. Nth Magical Number  🔗  📝	🆓		⭐️⭐️⭐️	Math  🔗 Binary Search  🔗
879. Profitable Schemes  🔗  📝	🆓		⭐️⭐️⭐️	Array  🔗 Dynamic Programming  🔗
880. Decoded String at Index  🔗  📝	🆓		⭐️⭐️	String  🔗 Stack  🔗
881. Boats to Save People  🔗  📝	🆓	✅	⭐️⭐️	Array  🔗 Two Pointers  🔗 Greedy  🔗 Sorting  🔗
882. Reachable Nodes In Subdivided Graph  🔗  📝	🆓		⭐️⭐️⭐️	Graph  🔗 Heap (Priority Queue)  🔗 Shortest Path  🔗	2077. Paths in Maze That Lead to Same Room  🔗  📝 2092. Find All People With Secret  🔗  📝
883. Projection Area of 3D Shapes  🔗  📝	🆓		⭐️	Array  🔗 Math  🔗 Geometry  🔗 Matrix  🔗
884. Uncommon Words from Two Sentences  🔗  📝	🆓		⭐️	Hash Table  🔗 String  🔗	2085. Count Common Words With One Occurrence  🔗  📝
885. Spiral Matrix III  🔗  📝	🆓		⭐️⭐️	Array  🔗 Matrix  🔗 Simulation  🔗	54. Spiral Matrix  🔗  📝 59. Spiral Matrix II  🔗  📝 2326. Spiral Matrix IV  🔗  📝
886. Possible Bipartition  🔗  📝	🆓		⭐️⭐️	Depth-First Search  🔗 Breadth-First Search  🔗 Union Find  🔗 Graph  🔗
887. Super Egg Drop  🔗  📝	🆓		⭐️⭐️⭐️	Math  🔗 Binary Search  🔗 Dynamic Programming  🔗	1884. Egg Drop With 2 Eggs and N Floors  🔗  📝
888. Fair Candy Swap  🔗  📝	🆓	✅	⭐️	Array  🔗 Hash Table  🔗 Binary Search  🔗 Sorting  🔗
889. Construct Binary Tree from Preorder and Postorder Traversal  🔗  📝	🆓		⭐️⭐️	Array  🔗 Hash Table  🔗 Divide and Conquer  🔗 Tree  🔗 Binary Tree  🔗
890. Find and Replace Pattern  🔗  📝	🆓		⭐️⭐️	Array  🔗 Hash Table  🔗 String  🔗
891. Sum of Subsequence Widths  🔗  📝	🆓		⭐️⭐️⭐️	Array  🔗 Math  🔗 Sorting  🔗
892. Surface Area of 3D Shapes  🔗  📝	🆓		⭐️	Array  🔗 Math  🔗 Geometry  🔗 Matrix  🔗
893. Groups of Special-Equivalent Strings  🔗  📝	🆓		⭐️⭐️	Array  🔗 Hash Table  🔗 String  🔗
894. All Possible Full Binary Trees  🔗  📝	🆓		⭐️⭐️	Dynamic Programming  🔗 Tree  🔗 Recursion  🔗 Memoization  🔗 Binary Tree  🔗
895. Maximum Frequency Stack  🔗  📝	🆓	✅	⭐️⭐️⭐️	Hash Table  🔗 Stack  🔗 Design  🔗 Ordered Set  🔗
896. Monotonic Array  🔗  📝	🆓	✅	⭐️	Array  🔗	2210. Count Hills and Valleys in an Array  🔗  📝
897. Increasing Order Search Tree  🔗  📝	🆓	✅	⭐️	Stack  🔗 Tree  🔗 Depth-First Search  🔗 Binary Search Tree  🔗 Binary Tree  🔗
898. Bitwise ORs of Subarrays  🔗  📝	🆓		⭐️⭐️	Array  🔗 Dynamic Programming  🔗 Bit Manipulation  🔗
899. Orderly Queue  🔗  📝	🆓		⭐️⭐️⭐️	Math  🔗 String  🔗 Sorting  🔗
900. RLE Iterator  🔗  📝	🆓		⭐️⭐️	Array  🔗 Design  🔗 Counting  🔗 Iterator  🔗