| 3313. Find the Last Marked Nodes in Tree | Solution | Solve | Hard | | |
| 3317. Find the Number of Possible Ways for an Event | Solution | Solve | Hard | | |
| 3320. Count The Number of Winning Sequences | Solution | Solve | Hard | | |
| 3321. Find X-Sum of All K-Long Subarrays II | Solution | Solve | Hard | | |
| 3327. Check if DFS Strings Are Palindromes | Solution | Solve | Hard | | |
| 3329. Count Substrings With K-Frequency Characters II | Solution | Solve | Hard | - | |
| 3333. Find the Original Typed String II | Solution | Solve | Hard | | |
| 3336. Find the Number of Subsequences With Equal GCD | Solution | Solve | Hard | | |
| 3337. Total Characters in String After Transformations II | Solution | Solve | Hard | | |
| 3343. Count Number of Balanced Permutations | Solution | Solve | Hard | | |
| 3347. Maximum Frequency of an Element After Performing Operations II | Solution | Solve | Hard | | |
| 3348. Smallest Divisible Digit Product II | Solution | Solve | Hard | | |
| 3351. Sum of Good Subsequences | Solution | Solve | Hard | | |
| 3352. Count K-Reducible Numbers Less Than N | Solution | Solve | Hard | | |
| 3357. Minimize the Maximum Adjacent Element Difference | Solution | Solve | Hard | | |
| 3359. Find Sorted Submatrices With Maximum Element at Most K | Solution | Solve | Hard | - | |
| 3363. Find the Maximum Number of Fruits Collected | Solution | Solve | Hard | | |
| 3367. Maximize Sum of Weights after Edge Removals | Solution | Solve | Hard | | |
| 3368. First Letter Capitalization | Solution | Solve | Hard | - | |
| 3369. Design an Array Statistics Tracker | Solution | Solve | Hard | | |
| 3373. Maximize the Number of Target Nodes After Connecting Trees II | Solution | Solve | Hard | | |
| 3374. First Letter Capitalization II | Solution | Solve | Hard | - | |
| 3873. Maximum Points Activated with One Addition | Solution | Solve | Hard | - | |
| 3855. Sum of K-Digit Numbers in a Range | Solution | Solve | Hard | - | |
| 3878. Count Good Subarrays | Solution | Solve | Hard | - | |
| 3841. Palindromic Path Queries in a Tree | Solution | Solve | Hard | - | |
| 3845. Maximum Subarray XOR with Bounded Range | Solution | Solve | Hard | - | |
| 3836. Maximum Score Using Exactly K Pairs | Solution | Solve | Hard | - | |
| 3830. Longest Alternating Subarray After Removing At Most One Element | Solution | Solve | Hard | - | |
| 3864. Minimum Cost to Partition a Binary String | Solution | Solve | Hard | - | |
| 3821. Find Nth Smallest Integer With K One Bits | Solution | Solve | Hard | | |
| 3812. Minimum Edge Toggles on a Tree | Solution | Solve | Hard | - | |
| 3782. Last Remaining Integer After Alternating Deletion Operations | Solution | Solve | Hard | - | |
| 3869. Count Fancy Numbers in a Range | Solution | Solve | Hard | - | |
| 3806. Maximum Bitwise AND After Increment Operations | Solution | Solve | Hard | | |
| 3797. Count Routes to Climb a Rectangular Grid | Solution | Solve | Hard | | |
| 3772. Maximum Subgraph Score in a Tree | Solution | Solve | Hard | | |
| 3768. Minimum Inversion Count in Subarrays of Fixed Length | Solution | Solve | Hard | - | |
| 3801. Minimum Cost to Merge Sorted Lists | Solution | Solve | Hard | - | |
| 3749. Evaluate Valid Expressions | Solution | Solve | Hard | - | |
| 3757. Number of Effective Subsequences | Solution | Solve | Hard | - | |
| 3802. Number of Ways to Paint Sheets | Solution | Solve | Hard | - | |
| 3753. Total Waviness of Numbers in Range II | Solution | Solve | Hard | - | |
| 3826. Minimum Partition Score | Solution | Solve | Hard | - | |
| 3748. Count Stable Subarrays | Solution | Solve | Hard | - | |
| 3735. Lexicographically Smallest String After Reverse II | Solution | Solve | Hard | - | |
| 3791. Number of Balanced Integers in a Range | Solution | Solve | Hard | - | |
| 3816. Lexicographically Smallest String After Deleting Duplicate Characters | Solution | Solve | Hard | | |
| 3739. Count Subarrays With Majority Element II | Solution | Solve | Hard | - | |
| 3786. Total Sum of Interaction Cost in Tree Groups | Solution | Solve | Hard | | |
