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Question	Free?	Status	Difficulty	Topics	Similar Questions
1501. Countries You Can Safely Invest In  🔗  📝	💰		⭐️⭐️	Database  🔗	615. Average Salary: Departments VS Company  🔗  📝
1502. Can Make Arithmetic Progression From Sequence  🔗  📝	🆓	✅	⭐️	Array  🔗 Sorting  🔗	1630. Arithmetic Subarrays  🔗  📝
1503. Last Moment Before All Ants Fall Out of a Plank  🔗  📝	🆓		⭐️⭐️	Array  🔗 Brainteaser  🔗 Simulation  🔗	2211. Count Collisions on a Road  🔗  📝
1504. Count Submatrices With All Ones  🔗  📝	🆓		⭐️⭐️	Array  🔗 Dynamic Programming  🔗 Stack  🔗 Matrix  🔗 Monotonic Stack  🔗
1505. Minimum Possible Integer After at Most K Adjacent Swaps On Digits  🔗  📝	🆓		⭐️⭐️⭐️	String  🔗 Greedy  🔗 Binary Indexed Tree  🔗 Segment Tree  🔗
1506. Find Root of N-Ary Tree  🔗  📝	💰		⭐️⭐️	Hash Table  🔗 Bit Manipulation  🔗 Tree  🔗 Depth-First Search  🔗	1516. Move Sub-Tree of N-Ary Tree  🔗  📝
1507. Reformat Date  🔗  📝	🆓	✅	⭐️	String  🔗
1508. Range Sum of Sorted Subarray Sums  🔗  📝	🆓		⭐️⭐️	Array  🔗 Two Pointers  🔗 Binary Search  🔗 Sorting  🔗
1509. Minimum Difference Between Largest and Smallest Value in Three Moves  🔗  📝	🆓	✅	⭐️⭐️	Array  🔗 Greedy  🔗 Sorting  🔗
1510. Stone Game IV  🔗  📝	🆓		⭐️⭐️⭐️	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  🔗  📝
1511. Customer Order Frequency  🔗  📝	💰		⭐️	Database  🔗
1512. Number of Good Pairs  🔗  📝	🆓	✅	⭐️	Array  🔗 Hash Table  🔗 Math  🔗 Counting  🔗	2001. Number of Pairs of Interchangeable Rectangles  🔗  📝 2083. Substrings That Begin and End With the Same Letter  🔗  📝
1513. Number of Substrings With Only 1s  🔗  📝	🆓		⭐️⭐️	Math  🔗 String  🔗	1759. Count Number of Homogenous Substrings  🔗  📝 2062. Count Vowel Substrings of a String  🔗  📝
1514. Path with Maximum Probability  🔗  📝	🆓		⭐️⭐️	Graph  🔗 Heap (Priority Queue)  🔗 Shortest Path  🔗	1976. Number of Ways to Arrive at Destination  🔗  📝
1515. Best Position for a Service Centre  🔗  📝	🆓		⭐️⭐️⭐️	Math  🔗 Geometry  🔗 Randomized  🔗
1516. Move Sub-Tree of N-Ary Tree  🔗  📝	💰		⭐️⭐️⭐️	Tree  🔗 Depth-First Search  🔗	1506. Find Root of N-Ary Tree  🔗  📝
1517. Find Users With Valid E-Mails  🔗  📝	💰		⭐️	Database  🔗
1518. Water Bottles  🔗  📝	🆓		⭐️	Math  🔗 Simulation  🔗
1519. Number of Nodes in the Sub-Tree With the Same Label  🔗  📝	🆓		⭐️⭐️	Hash Table  🔗 Tree  🔗 Depth-First Search  🔗 Breadth-First Search  🔗 Counting  🔗
1520. Maximum Number of Non-Overlapping Substrings  🔗  📝	🆓		⭐️⭐️⭐️	String  🔗 Greedy  🔗
1521. Find a Value of a Mysterious Function Closest to Target  🔗  📝	🆓		⭐️⭐️⭐️	Array  🔗 Binary Search  🔗 Bit Manipulation  🔗 Segment Tree  🔗
1522. Diameter of N-Ary Tree  🔗  📝	💰		⭐️⭐️	Tree  🔗 Depth-First Search  🔗	543. Diameter of Binary Tree  🔗  📝
1523. Count Odd Numbers in an Interval Range  🔗  📝	🆓	✅	⭐️	Math  🔗
1524. Number of Sub-arrays With Odd Sum  🔗  📝	🆓		⭐️⭐️	Array  🔗 Math  🔗 Dynamic Programming  🔗 Prefix Sum  🔗	2098. Subsequence of Size K With the Largest Even Sum  🔗  📝
1525. Number of Good Ways to Split a String  🔗  📝	🆓		⭐️⭐️	String  🔗 Dynamic Programming  🔗 Bit Manipulation  🔗
1526. Minimum Number of Increments on Subarrays to Form a Target Array  🔗  📝	🆓		⭐️⭐️⭐️	Array  🔗 Dynamic Programming  🔗 Stack  🔗 Greedy  🔗 Monotonic Stack  🔗
1527. Patients With a Condition  🔗  📝	🆓		⭐️	Database  🔗
1528. Shuffle String  🔗  📝	🆓	✅	⭐️	Array  🔗 String  🔗
1529. Minimum Suffix Flips  🔗  📝	🆓		⭐️⭐️	String  🔗 Greedy  🔗
1530. Number of Good Leaf Nodes Pairs  🔗  📝	🆓		⭐️⭐️	Tree  🔗 Depth-First Search  🔗 Binary Tree  🔗
1531. String Compression II  🔗  📝	🆓		⭐️⭐️⭐️	String  🔗 Dynamic Programming  🔗
1532. The Most Recent Three Orders  🔗  📝	💰		⭐️⭐️	Database  🔗	1549. The Most Recent Orders for Each Product  🔗  📝
1533. Find the Index of the Large Integer  🔗  📝	💰		⭐️⭐️	Array  🔗 Binary Search  🔗 Interactive  🔗	702. Search in a Sorted Array of Unknown Size  🔗  📝
1534. Count Good Triplets  🔗  📝	🆓	✅	⭐️	Array  🔗 Enumeration  🔗	1995. Count Special Quadruplets  🔗  📝
1535. Find the Winner of an Array Game  🔗  📝	🆓		⭐️⭐️	Array  🔗 Simulation  🔗
1536. Minimum Swaps to Arrange a Binary Grid  🔗  📝	🆓		⭐️⭐️	Array  🔗 Greedy  🔗 Matrix  🔗
1537. Get the Maximum Score  🔗  📝	🆓		⭐️⭐️⭐️	Array  🔗 Two Pointers  🔗 Dynamic Programming  🔗 Greedy  🔗	2242. Maximum Score of a Node Sequence  🔗  📝
1538. Guess the Majority in a Hidden Array  🔗  📝	💰		⭐️⭐️	Array  🔗 Math  🔗 Interactive  🔗
1539. Kth Missing Positive Number  🔗  📝	🆓	✅	⭐️	Array  🔗 Binary Search  🔗	2195. Append K Integers With Minimal Sum  🔗  📝
1540. Can Convert String in K Moves  🔗  📝	🆓		⭐️⭐️	Hash Table  🔗 String  🔗
1541. Minimum Insertions to Balance a Parentheses String  🔗  📝	🆓		⭐️⭐️	String  🔗 Stack  🔗 Greedy  🔗	1963. Minimum Number of Swaps to Make the String Balanced  🔗  📝
1542. Find Longest Awesome Substring  🔗  📝	🆓		⭐️⭐️⭐️	Hash Table  🔗 String  🔗 Bit Manipulation  🔗
1543. Fix Product Name Format  🔗  📝	💰		⭐️	Database  🔗
1544. Make The String Great  🔗  📝	🆓		⭐️	String  🔗 Stack  🔗
1545. Find Kth Bit in Nth Binary String  🔗  📝	🆓		⭐️⭐️	String  🔗 Recursion  🔗
1546. Maximum Number of Non-Overlapping Subarrays With Sum Equals Target  🔗  📝	🆓		⭐️⭐️	Array  🔗 Hash Table  🔗 Greedy  🔗 Prefix Sum  🔗
1547. Minimum Cost to Cut a Stick  🔗  📝	🆓		⭐️⭐️⭐️	Array  🔗 Dynamic Programming  🔗	2147. Number of Ways to Divide a Long Corridor  🔗  📝
1548. The Most Similar Path in a Graph  🔗  📝	💰		⭐️⭐️⭐️	Dynamic Programming  🔗 Graph  🔗
1549. The Most Recent Orders for Each Product  🔗  📝	💰		⭐️⭐️	Database  🔗	1532. The Most Recent Three Orders  🔗  📝 1596. The Most Frequently Ordered Products for Each Customer  🔗  📝
1550. Three Consecutive Odds  🔗  📝	🆓	✅	⭐️	Array  🔗
1551. Minimum Operations to Make Array Equal  🔗  📝	🆓		⭐️⭐️	Math  🔗
1552. Magnetic Force Between Two Balls  🔗  📝	🆓		⭐️⭐️	Array  🔗 Binary Search  🔗 Sorting  🔗	2064. Minimized Maximum of Products Distributed to Any Store  🔗  📝
1553. Minimum Number of Days to Eat N Oranges  🔗  📝	🆓		⭐️⭐️⭐️	Dynamic Programming  🔗 Memoization  🔗
1554. Strings Differ by One Character  🔗  📝	💰		⭐️⭐️	Hash Table  🔗 String  🔗 Rolling Hash  🔗 Hash Function  🔗	2135. Count Words Obtained After Adding a Letter  🔗  📝
1555. Bank Account Summary  🔗  📝	💰		⭐️⭐️	Database  🔗
1556. Thousand Separator  🔗  📝	🆓		⭐️	String  🔗
1557. Minimum Number of Vertices to Reach All Nodes  🔗  📝	🆓		⭐️⭐️	Graph  🔗
1558. Minimum Numbers of Function Calls to Make Target Array  🔗  📝	🆓		⭐️⭐️	Array  🔗 Greedy  🔗
1559. Detect Cycles in 2D Grid  🔗  📝	🆓		⭐️⭐️	Array  🔗 Depth-First Search  🔗 Breadth-First Search  🔗 Union Find  🔗 Matrix  🔗
1560. Most Visited Sector ina Circular Track  🔗  📝	🆓		⭐️	Array  🔗 Simulation  🔗
1561. Maximum Number of Coins You Can Get  🔗  📝	🆓		⭐️⭐️	Array  🔗 Math  🔗 Greedy  🔗 Sorting  🔗 Game Theory  🔗
1562. Find Latest Group of Size M  🔗  📝	🆓		⭐️⭐️	Array  🔗 Binary Search  🔗 Simulation  🔗
1563. Stone Game V  🔗  📝	🆓		⭐️⭐️⭐️	Array  🔗 Math  🔗 Dynamic Programming  🔗 Game Theory  🔗	877. Stone Game  🔗  📝 1140. Stone Game II  🔗  📝 1406. Stone Game III  🔗  📝 1510. Stone Game IV  🔗  📝 1686. Stone Game VI  🔗  📝 1690. Stone Game VII  🔗  📝 1872. Stone Game VIII  🔗  📝 2029. Stone Game IX  🔗  📝
1564. Put Boxes Into the Warehouse I  🔗  📝	💰		⭐️⭐️	Array  🔗 Greedy  🔗 Sorting  🔗	1580. Put Boxes Into the Warehouse II  🔗  📝
1565. Unique Orders and Customers Per Month  🔗  📝	💰		⭐️	Database  🔗
1566. Detect Pattern of Length M Repeated K or More Times  🔗  📝	🆓	✅	⭐️	Array  🔗 Enumeration  🔗	1668. Maximum Repeating Substring  🔗  📝
1567. Maximum Length of Subarray With Positive Product  🔗  📝	🆓		⭐️⭐️	Array  🔗 Dynamic Programming  🔗 Greedy  🔗
1568. Minimum Number of Days to Disconnect Island  🔗  📝	🆓		⭐️⭐️⭐️	Array  🔗 Depth-First Search  🔗 Breadth-First Search  🔗 Matrix  🔗 Strongly Connected Component  🔗
1569. Number of Ways to Reorder Array to Get Same BST  🔗  📝	🆓		⭐️⭐️⭐️	Array  🔗 Math  🔗 Divide and Conquer  🔗 Dynamic Programming  🔗 Tree  🔗 Union Find  🔗 Binary Search Tree  🔗 Memoization  🔗 Combinatorics  🔗 Binary Tree  🔗
1570. Dot Product of Two Sparse Vectors  🔗  📝	💰		⭐️⭐️	Array  🔗 Hash Table  🔗 Two Pointers  🔗 Design  🔗
1571. Warehouse Manager  🔗  📝	💰		⭐️	Database  🔗
1572. Matrix Diagonal Sum  🔗  📝	🆓	✅	⭐️	Array  🔗 Matrix  🔗	2133. Check if Every Row and Column Contains All Numbers  🔗  📝 2319. Check if Matrix Is X-Matrix  🔗  📝
1573. Number of Ways to Split a String  🔗  📝	🆓		⭐️⭐️	Math  🔗 String  🔗	548. Split Array with Equal Sum  🔗  📝
1574. Shortest Subarray to be Removed to Make Array Sorted  🔗  📝	🆓		⭐️⭐️	Array  🔗 Two Pointers  🔗 Binary Search  🔗 Stack  🔗 Monotonic Stack  🔗
1575. Count All Possible Routes  🔗  📝	🆓		⭐️⭐️⭐️	Array  🔗 Dynamic Programming  🔗 Memoization  🔗
1576. Replace All ?'s to Avoid Consecutive Repeating Characters  🔗  📝	🆓		⭐️	String  🔗
1577. Number of Ways Where Square of Number Is Equal to Product of Two Numbers  🔗  📝	🆓		⭐️⭐️	Array  🔗 Hash Table  🔗 Math  🔗 Two Pointers  🔗
1578. Minimum Time to Make Rope Colorful  🔗  📝	🆓		⭐️⭐️	Array  🔗 String  🔗 Dynamic Programming  🔗 Greedy  🔗
1579. Remove Max Number of Edges to Keep Graph Fully Traversable  🔗  📝	🆓		⭐️⭐️⭐️	Union Find  🔗 Graph  🔗
1580. Put Boxes Into the Warehouse II  🔗  📝	💰		⭐️⭐️	Array  🔗 Greedy  🔗 Sorting  🔗	1564. Put Boxes Into the Warehouse I  🔗  📝
1581. Customer Who Visited but Did Not Make Any Transactions  🔗  📝	🆓		⭐️	Database  🔗	1607. Sellers With No Sales  🔗  📝
1582. Special Positions in a Binary Matrix  🔗  📝	🆓		⭐️	Array  🔗 Matrix  🔗
1583. Count Unhappy Friends  🔗  📝	🆓		⭐️⭐️	Array  🔗 Simulation  🔗
1584. Min Cost to Connect All Points  🔗  📝	🆓		⭐️⭐️	Array  🔗 Union Find  🔗 Minimum Spanning Tree  🔗	2152. Minimum Number of Lines to Cover Points  🔗  📝
1585. Check If String Is Transformable With Substring Sort Operations  🔗  📝	🆓		⭐️⭐️⭐️	String  🔗 Greedy  🔗 Sorting  🔗
1586. Binary Search Tree Iterator II  🔗  📝	💰		⭐️⭐️	Stack  🔗 Tree  🔗 Design  🔗 Binary Search Tree  🔗 Binary Tree  🔗 Iterator  🔗	173. Binary Search Tree Iterator  🔗  📝
1587. Bank Account Summary II  🔗  📝	🆓		⭐️	Database  🔗
1588. Sum of All Odd Length Subarrays  🔗  📝	🆓	✅	⭐️	Array  🔗 Math  🔗 Prefix Sum  🔗
1589. Maximum Sum Obtained of Any Permutation  🔗  📝	🆓		⭐️⭐️	Array  🔗 Greedy  🔗 Sorting  🔗 Prefix Sum  🔗
1590. Make Sum Divisible by P  🔗  📝	🆓		⭐️⭐️	Array  🔗 Hash Table  🔗 Prefix Sum  🔗	974. Subarray Sums Divisible by K  🔗  📝
1591. Strange Printer II  🔗  📝	🆓		⭐️⭐️⭐️	Array  🔗 Graph  🔗 Topological Sort  🔗 Matrix  🔗	664. Strange Printer  🔗  📝 2360. Longest Cycle in a Graph  🔗  📝
1592. Rearrange Spaces Between Words  🔗  📝	🆓	✅	⭐️	String  🔗	68. Text Justification  🔗  📝
1593. Split a String Into the Max Number of Unique Substrings  🔗  📝	🆓		⭐️⭐️	Hash Table  🔗 String  🔗 Backtracking  🔗
1594. Maximum Non Negative Product in a Matrix  🔗  📝	🆓		⭐️⭐️	Array  🔗 Dynamic Programming  🔗 Matrix  🔗
1595. Minimum Cost to Connect Two Groups of Points  🔗  📝	🆓		⭐️⭐️⭐️	Array  🔗 Dynamic Programming  🔗 Bit Manipulation  🔗 Matrix  🔗 Bitmask  🔗
1596. The Most Frequently Ordered Products for Each Customer  🔗  📝	💰		⭐️⭐️	Database  🔗	1549. The Most Recent Orders for Each Product  🔗  📝
1597. Build Binary Expression Tree From Infix Expression  🔗  📝	💰		⭐️⭐️⭐️	String  🔗 Stack  🔗 Tree  🔗 Binary Tree  🔗	772. Basic Calculator III  🔗  📝 1612. Check If Two Expression Trees are Equivalent  🔗  📝
1598. Crawler Log Folder  🔗  📝	🆓	✅	⭐️	Array  🔗 String  🔗 Stack  🔗	682. Baseball Game  🔗  📝 844. Backspace String Compare  🔗  📝
1599. Maximum Profit of Operating a Centennial Wheel  🔗  📝	🆓		⭐️⭐️	Array  🔗 Simulation  🔗
1600. Throne Inheritance  🔗  📝	🆓		⭐️⭐️	Hash Table  🔗 Tree  🔗 Depth-First Search  🔗 Design  🔗	1993. Operations on Tree  🔗  📝