| 1233 | Remove Sub-Folders from the Filesystem | ArrayStringDepth-First Search+1 | Medium |
| 1234 | Replace the Substring for Balanced String | StringSliding Window | Medium |
| 1237 | Find Positive Integer Solution for a Given Equation | MathTwo PointersBinary Search+1 | Medium |
| 1238 | Circular Permutation in Binary Representation | MathBacktrackingBit Manipulation | Medium |
| 1239 | Maximum Length of a Concatenated String with Unique Characters | ArrayStringBacktracking+1 | Medium |
| 1247 | Minimum Swaps to Make Strings Equal | MathStringGreedy | Medium |
| 1248 | Count Number of Nice Subarrays | ArrayHash TableMath+2 | Medium |
| 1249 | Minimum Remove to Make Valid Parentheses | StringStack | Medium |
| 1253 | Reconstruct a 2-Row Binary Matrix | ArrayGreedyMatrix | Medium |
| 1254 | Number of Closed Islands | ArrayDepth-First SearchBreadth-First Search+2 | Medium |
| 1261 | Find Elements in a Contaminated Binary Tree | Hash TableTreeDepth-First Search+3 | Medium |
| 1262 | Greatest Sum Divisible by Three | ArrayDynamic ProgrammingGreedy+1 | Medium |
| 1267 | Count Servers that Communicate | ArrayDepth-First SearchBreadth-First Search+3 | Medium |
| 1268 | Search Suggestions System | ArrayStringBinary Search+3 | Medium |
| 1276 | Number of Burgers with No Waste of Ingredients | Math | Medium |
| 1277 | Count Square Submatrices with All Ones | ArrayDynamic ProgrammingMatrix | Medium |
| 1282 | Group the People Given the Group Size They Belong To | ArrayHash TableGreedy | Medium |
| 1283 | Find the Smallest Divisor Given a Threshold | ArrayBinary Search | Medium |
| 1286 | Iterator for Combination | StringBacktrackingDesign+1 | Medium |
| 1288 | Remove Covered Intervals | ArraySorting | Medium |
| 1291 | Sequential Digits | Enumeration | Medium |
| 1292 | Maximum Side Length of a Square with Sum Less than or Equal to Threshold | ArrayBinary SearchMatrix+1 | Medium |
| 1296 | Divide Array in Sets of K Consecutive Numbers | ArrayHash TableGreedy+1 | Medium |
| 1297 | Maximum Number of Occurrences of a Substring | Hash TableStringSliding Window | Medium |
| 1300 | Sum of Mutated Array Closest to Target | ArrayBinary SearchSorting | Medium |
| 1302 | Deepest Leaves Sum | TreeDepth-First SearchBreadth-First Search+1 | Medium |
| 1305 | All Elements in Two Binary Search Trees | TreeDepth-First SearchBinary Search Tree+2 | Medium |
| 1306 | Jump Game III | ArrayDepth-First SearchBreadth-First Search | Medium |
| 1310 | XOR Queries of a Subarray | ArrayBit ManipulationPrefix Sum | Medium |
| 1311 | Get Watched Videos by Your Friends | ArrayHash TableBreadth-First Search+2 | Medium |
| 1314 | Matrix Block Sum | ArrayMatrixPrefix Sum | Medium |
| 1315 | Sum of Nodes with Even-Valued Grandparent | TreeDepth-First SearchBreadth-First Search+1 | Medium |
| 1318 | Minimum Flips to Make a OR b Equal to c | Bit Manipulation | Medium |
| 1319 | Number of Operations to Make Network Connected | Depth-First SearchBreadth-First SearchUnion Find+1 | Medium |
| 1321 | Restaurant Growth | Database | Medium |
| 1324 | Print Words Vertically | ArrayStringSimulation | Medium |
| 1325 | Delete Leaves With a Given Value | TreeDepth-First SearchBinary Tree | Medium |
| 1328 | Break a Palindrome | StringGreedy | Medium |
| 1329 | Sort the Matrix Diagonally | ArraySortingMatrix | Medium |
| 1333 | Filter Restaurants by Vegan-Friendly, Price and Distance | ArraySorting | Medium |
| 1334 | Find the City With the Smallest Number of Neighbors at a Threshold Distance | Dynamic ProgrammingGraphShortest Path | Medium |
| 1338 | Reduce Array Size to The Half | ArrayHash TableGreedy+2 | Medium |
| 1339 | Maximum Product of Splitted Binary Tree | TreeDepth-First SearchBinary Tree | Medium |
| 1341 | Movie Rating | Database | Medium |
| 1343 | Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold | ArraySliding Window | Medium |
| 1344 | Angle Between Hands of a Clock | Math | Medium |
| 1347 | Minimum Number of Steps to Make Two Strings Anagram | Hash TableStringCounting | Medium |
| 1348 | Tweet Counts Per Frequency | Hash TableBinary SearchDesign+2 | Medium |
| 1352 | Product of the Last K Numbers | ArrayMathDesign+2 | Medium |
| 1353 | Maximum Number of Events That Can Be Attended | ArrayGreedySorting+1 | Medium |