Problems

3,848+ problems · 928 Easy · 2014 Medium · 906 Hard

Active:Premium· 755 results

Title	Solution	Practice	Difficulty	Companies	Topics
1303. Find the Team Size	Solution	Solve	Easy	Amazon	Database
1308. Running Total for Different Genders	Solution	Solve	Medium	-	Database
1322. Ads Performance	Solution	Solve	Easy	Meta	Database
1336. Number of Transactions per Visit	Solution	Solve	Hard	Machine Zone+1	Database
1350. Students With Invalid Departments	Solution	Solve	Easy	Amazon	Database
1355. Activity Participants	Solution	Solve	Medium	IBM	Database
1364. Number of Trusted Contacts of a Customer	Solution	Solve	Medium	Roblox	Database
1369. Get the Second Most Recent Activity	Solution	Solve	Hard	Microsoft	Database
1384. Total Sales Amount by Year	Solution	Solve	Hard	-	Database
1398. Customers Who Bought Products A and B but Not C	Solution	Solve	Medium	Meta	Database
1412. Find the Quiet Students in All Exams	Solution	Solve	Hard	-	Database
1421. NPV Queries	Solution	Solve	Easy	Amazon	Database
1426. Counting Elements	Solution	Solve	Easy	Drw	Array Hash Table
1427. Perform String Shifts	Solution	Solve	Easy	Goldman Sachs	Array Math+1
1428. Leftmost Column with at Least a One	Solution	Solve	Medium	Meta+2	Array Binary Search+2
1429. First Unique Number	Solution	Solve	Medium	Amazon+4	Array Data Stream+3
1430. Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree	Solution	Solve	Medium	-	Binary Tree Breadth-First Search+2
1435. Create a Session Bar Chart	Solution	Solve	Easy	Twitch	Database
1440. Evaluate Boolean Expression	Solution	Solve	Medium	Point72	Database
1445. Apples & Oranges	Solution	Solve	Medium	Meta	Database
1454. Active Users	Solution	Solve	Medium	Amazon+1	Database
1459. Rectangles Area	Solution	Solve	Medium	Twitter	Database
1468. Calculate Salaries	Solution	Solve	Medium	-	Database
1469. Find All The Lonely Nodes	Solution	Solve	Easy	Microsoft	Binary Tree Breadth-First Search+2
1474. Delete N Nodes After M Nodes of a Linked List	Solution	Solve	Easy	Microsoft	Linked List
1479. Sales by Day of the Week	Solution	Solve	Hard	Amazon	Database
1485. Clone Binary Tree With Random Pointer	Solution	Solve	Medium	Amazon+1	Binary Tree Breadth-First Search+3
1490. Clone N-ary Tree	Solution	Solve	Medium	Amazon	Breadth-First Search Depth-First Search+2
1495. Friendly Movies Streamed Last Month	Solution	Solve	Easy	Amazon	Database
1500. Design a File Sharing System	Solution	Solve	Medium	Twitch	Data Stream Design+3
1501. Countries You Can Safely Invest In	Solution	Solve	Medium	-	Database
1506. Find Root of N-Ary Tree	Solution	Solve	Medium	Bloomberg+2	Bit Manipulation Depth-First Search+2
1511. Customer Order Frequency	Solution	Solve	Easy	Amazon	Database
1516. Move Sub-Tree of N-Ary Tree	Solution	Solve	Hard	Google	Depth-First Search Tree
1522. Diameter of N-Ary Tree	Solution	Solve	Medium	DoorDash+3	Depth-First Search Tree
1532. The Most Recent Three Orders	Solution	Solve	Medium	-	Database
1533. Find the Index of the Large Integer	Solution	Solve	Medium	Amazon	Array Binary Search+1
1538. Guess the Majority in a Hidden Array	Solution	Solve	Medium	Google	Array Interactive+1
1543. Fix Product Name Format	Solution	Solve	Easy	-	Database
1548. The Most Similar Path in a Graph	Solution	Solve	Hard	Google	Dynamic Programming Graph
1549. The Most Recent Orders for Each Product	Solution	Solve	Medium	Amazon	Database
1554. Strings Differ by One Character	Solution	Solve	Medium	Airbnb+1	Hash Function Hash Table+2
1555. Bank Account Summary	Solution	Solve	Medium	Optum	Database
1564. Put Boxes Into the Warehouse I	Solution	Solve	Medium	Google+1	Array Greedy+1
1565. Unique Orders and Customers Per Month	Solution	Solve	Easy	-	Database
1570. Dot Product of Two Sparse Vectors	Solution	Solve	Medium	Amazon+11	Array Design+2
1571. Warehouse Manager	Solution	Solve	Easy	Amazon	Database
1580. Put Boxes Into the Warehouse II	Solution	Solve	Medium	Google+1	Array Greedy+1
1586. Binary Search Tree Iterator II	Solution	Solve	Medium	Meta	Binary Search Tree Binary Tree+4
1596. The Most Frequently Ordered Products for Each Customer	Solution	Solve	Medium	Amazon	Database