| 1357 | Apply Discount Every n Orders | ArrayHash TableDesign | Medium |
| 1358 | Number of Substrings Containing All Three Characters | Hash TableStringSliding Window | Medium |
| 1361 | Validate Binary Tree Nodes | TreeDepth-First SearchBreadth-First Search+3 | Medium |
| 1362 | Closest Divisors | Math | Medium |
| 1366 | Rank Teams by Votes | ArrayHash TableString+2 | Medium |
| 1367 | Linked List in Binary Tree | Linked ListTreeDepth-First Search+1 | Medium |
| 1371 | Find the Longest Substring Containing Vowels in Even Counts | Hash TableStringBit Manipulation+1 | Medium |
| 1372 | Longest ZigZag Path in a Binary Tree | Dynamic ProgrammingTreeDepth-First Search+1 | Medium |
| 1375 | Number of Times Binary String Is Prefix-Aligned | Array | Medium |
| 1376 | Time Needed to Inform All Employees | TreeDepth-First SearchBreadth-First Search | Medium |
| 1381 | Design a Stack With Increment Operation | ArrayStackDesign | Medium |
| 1382 | Balance a Binary Search Tree | Divide and ConquerGreedyTree+3 | Medium |
| 1386 | Cinema Seat Allocation | ArrayHash TableGreedy+1 | Medium |
| 1387 | Sort Integers by The Power Value | Dynamic ProgrammingMemoizationSorting | Medium |
| 1390 | Four Divisors | ArrayMath | Medium |
| 1391 | Check if There is a Valid Path in a Grid | ArrayDepth-First SearchBreadth-First Search+2 | Medium |
| 1393 | Capital Gain/Loss | Database | Medium |
| 1395 | Count Number of Teams | ArrayDynamic ProgrammingBinary Indexed Tree+1 | Medium |
| 1396 | Design Underground System | Hash TableStringDesign | Medium |
| 1400 | Construct K Palindrome Strings | Hash TableStringGreedy+1 | Medium |
| 1401 | Circle and Rectangle Overlapping | MathGeometry | Medium |
| 1404 | Number of Steps to Reduce a Number in Binary Representation to One | StringBit ManipulationSimulation | Medium |
| 1405 | Longest Happy String | StringGreedyHeap (Priority Queue) | Medium |
| 1409 | Queries on a Permutation With Key | ArrayBinary Indexed TreeSimulation | Medium |
| 1410 | HTML Entity Parser | Hash TableString | Medium |
| 1414 | Find the Minimum Number of Fibonacci Numbers Whose Sum Is K | MathGreedy | Medium |
| 1415 | The k-th Lexicographical String of All Happy Strings of Length n | StringBacktracking | Medium |
| 1418 | Display Table of Food Orders in a Restaurant | ArrayHash TableString+2 | Medium |
| 1419 | Minimum Number of Frogs Croaking | StringCounting | Medium |
| 1423 | Maximum Points You Can Obtain from Cards | ArraySliding WindowPrefix Sum | Medium |
| 1424 | Diagonal Traverse II | ArraySortingHeap (Priority Queue) | Medium |
| 1432 | Max Difference You Can Get From Changing an Integer | MathGreedy | Medium |
| 1433 | Check If a String Can Break Another String | StringGreedySorting | Medium |
| 1438 | Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit | ArrayQueueSliding Window+3 | Medium |
| 1441 | Build an Array With Stack Operations | ArrayStackSimulation | Medium |
| 1442 | Count Triplets That Can Form Two Arrays of Equal XOR | ArrayHash TableMath+2 | Medium |
| 1443 | Minimum Time to Collect All Apples in a Tree | Hash TableTreeDepth-First Search+1 | Medium |
| 1447 | Simplified Fractions | MathStringNumber Theory | Medium |
| 1448 | Count Good Nodes in Binary Tree | TreeDepth-First SearchBreadth-First Search+1 | Medium |
| 1451 | Rearrange Words in a Sentence | StringSorting | Medium |
| 1452 | People Whose List of Favorite Companies Is Not a Subset of Another List | ArrayHash TableString | Medium |
| 1456 | Maximum Number of Vowels in a Substring of Given Length | StringSliding Window | Medium |
| 1457 | Pseudo-Palindromic Paths in a Binary Tree | Bit ManipulationTreeDepth-First Search+2 | Medium |
| 1461 | Check If a String Contains All Binary Codes of Size K | Hash TableStringBit Manipulation+2 | Medium |
| 1462 | Course Schedule IV | Depth-First SearchBreadth-First SearchGraph+1 | Medium |
| 1465 | Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts | ArrayGreedySorting | Medium |
| 1466 | Reorder Routes to Make All Paths Lead to the City Zero | Depth-First SearchBreadth-First SearchGraph | Medium |
| 1471 | The k Strongest Values in an Array | ArrayTwo PointersSorting | Medium |
| 1472 | Design Browser History | ArrayLinked ListStack+3 | Medium |
| 1476 | Subrectangle Queries | ArrayDesignMatrix | Medium |