| 3074 | Apple Redistribution into Boxes | ArrayGreedySorting | Easy |
| 3075 | Maximize Happiness of Selected Children | ArrayGreedySorting | Medium |
| 3076 | Shortest Uncommon Substring in an Array | ArrayHash TableString+1 | Medium |
| 3077 | Maximum Strength of K Disjoint Subarrays | ArrayDynamic ProgrammingPrefix Sum | Hard |
| 3079 | Find the Sum of Encrypted Integers | ArrayMath | Easy |
| 3080 | Mark Elements on Array by Performing Queries | ArrayHash TableSorting+2 | Medium |
| 3081 | Replace Question Marks in String to Minimize Its Value | Hash TableStringGreedy+3 | Medium |
| 3082 | Find the Sum of the Power of All Subsequences | ArrayDynamic Programming | Hard |
| 3083 | Existence of a Substring in a String and Its Reverse | Hash TableString | Easy |
| 3084 | Count Substrings Starting and Ending with Given Character | MathStringCounting | Medium |
| 3085 | Minimum Deletions to Make String K-Special | Hash TableStringGreedy+2 | Medium |
| 3086 | Minimum Moves to Pick K Ones | ArrayGreedySliding Window+1 | Hard |
| 3090 | Maximum Length Substring With Two Occurrences | Hash TableStringSliding Window | Easy |
| 3091 | Apply Operations to Make Sum of Array Greater Than or Equal to k | MathGreedyEnumeration | Medium |
| 3092 | Most Frequent IDs | ArrayHash TableHeap (Priority Queue)+1 | Medium |
| 3093 | Longest Common Suffix Queries | ArrayStringTrie | Hard |
| 3095 | Shortest Subarray With OR at Least K I | ArrayBit ManipulationSliding Window | Easy |
| 3096 | Minimum Levels to Gain More Points | ArrayPrefix Sum | Medium |
| 3097 | Shortest Subarray With OR at Least K II | ArrayBit ManipulationSliding Window | Medium |
| 3098 | Find the Sum of Subsequence Powers | ArrayDynamic ProgrammingSorting | Hard |
| 3099 | Harshad Number | Math | Easy |
| 3100 | Water Bottles II | MathSimulation | Medium |
| 3101 | Count Alternating Subarrays | ArrayMath | Medium |
| 3102 | Minimize Manhattan Distances | ArrayMathGeometry+2 | Hard |
| 3105 | Longest Strictly Increasing or Strictly Decreasing Subarray | Array | Easy |
| 3106 | Lexicographically Smallest String After Operations With Constraint | StringGreedy | Medium |
| 3107 | Minimum Operations to Make Median of Array Equal to K | ArrayGreedySorting | Medium |
| 3108 | Minimum Cost Walk in Weighted Graph | ArrayBit ManipulationUnion Find+1 | Hard |
| 3110 | Score of a String | String | Easy |
| 3111 | Minimum Rectangles to Cover Points | ArrayGreedySorting | Medium |
| 3112 | Minimum Time to Visit Disappearing Nodes | ArrayGraphHeap (Priority Queue)+1 | Medium |
| 3113 | Find the Number of Subarrays Where Boundary Elements Are Maximum | ArrayBinary SearchStack+1 | Hard |
| 3114 | Latest Time You Can Obtain After Replacing Characters | StringEnumeration | Easy |
| 3115 | Maximum Prime Difference | ArrayMathNumber Theory | Medium |
| 3116 | Kth Smallest Amount With Single Denomination Combination | ArrayMathBinary Search+3 | Hard |
| 3117 | Minimum Sum of Values by Dividing Array | ArrayBinary SearchDynamic Programming+3 | Hard |
| 3120 | Count the Number of Special Characters I | Hash TableString | Easy |
| 3121 | Count the Number of Special Characters II | Hash TableString | Medium |
| 3122 | Minimum Number of Operations to Satisfy Conditions | ArrayDynamic ProgrammingMatrix | Medium |
| 3123 | Find Edges in Shortest Paths | Depth-First SearchBreadth-First SearchGraph+2 | Hard |
| 3127 | Make a Square with the Same Color | ArrayMatrixEnumeration | Easy |
| 3128 | Right Triangles | ArrayHash TableMath+2 | Medium |
| 3129 | Find All Possible Stable Binary Arrays I | Dynamic ProgrammingPrefix Sum | Medium |
| 3130 | Find All Possible Stable Binary Arrays II | Dynamic ProgrammingPrefix Sum | Hard |
| 3131 | Find the Integer Added to Array I | Array | Easy |
| 3132 | Find the Integer Added to Array II | ArrayTwo PointersSorting+1 | Medium |
| 3133 | Minimum Array End | Bit Manipulation | Medium |
| 3134 | Find the Median of the Uniqueness Array | ArrayHash TableBinary Search+1 | Hard |
| 3136 | Valid Word | String | Easy |
| 3137 | Minimum Number of Operations to Make Word K-Periodic | Hash TableStringCounting | Medium |