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Pinned Summary - My Time Machine

Posted on September 1, 2006

0. Pinned Summary My time machine, please go back to 2006-09-01 damn hot Hangzhou. [Read More]

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3961 - Maximize Sum of Device Ratings

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3960 - Frequency Balance Subarray

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3959 - Check Good Integer

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3958 - Minimum Cost to Split into Ones II

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3957 - Maximum Sum of M Non-Overlapping Subarrays II

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3956 - Maximum Sum of M Non-Overlapping Subarrays I

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3955 - Valid Binary Strings With Cost Limit

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3954 - Sum of Compatible Numbers in Range I

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3953 - Maximum Score with Co-Prime Element

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3952 - Maximum Total Value of Covered Indices

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3951 - Minimum Energy to Maintain Brightness

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3950 - Exactly One Consecutive Set Bits Pair

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3949 - Subtree Inversion Sum II

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3948 - Lexicographically Maximum MEX Array

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3947 - Maximum Number of Items From Sale II

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3946 - Maximum Number of Items From Sale I

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3945 - Digit Frequency Score

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3944 - Minimum Operations to Make Array Modulo Alternating II

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3943 - Number of Pairs After Increment

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3942 - Minimum Operations to Sort a Permutation

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3941 - Password Strength

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3940 - Limit Occurrences in Sorted Array

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3939 - Count Non Adjacent Subsets in a Rooted Tree

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3938 - Maximum Path Intersection Sum in a Grid

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3937 - Minimum Operations to Make Array Modulo Alternating I

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3936 - Minimum Swaps to Move Zeros to End

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3935 - Power Update After K-th Largest Insertion I

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3934 - Smallest Unique Subarray

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3933 - Largest Local Values in a Matrix II

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3932 - Count K-th Roots in a Range

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3931 - Check Adjacent Digit Differences

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3930 - Power Update After K-th Largest Insertion II

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3929 - Minimum Partition Score II

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3928 - Minimum Cost to Buy Apples II

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3927 - Minimize Array Sum Using Divisible Replacements

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3926 - Count Valid Word Occurrences

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3925 - Concatenate Array With Reverse

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3924 - Minimum Threshold Path With Limited Heavy Edges

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3923 - Minimum Generations to Target Point

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3922 - Minimum Flips to Make Binary String Coherent

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3921 - Score Validator

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3920 - Maximize Fixed Points After Deletions

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3919 - Minimum Cost to Move Between Indices

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3918 - Sum of Primes Between Number and Its Reverse

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3917 - Count Indices With Opposite Parity

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3916 - Number of ZigZag Arrays III

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3915 - Maximum Sum of Alternating Subsequence With Distance at Least K

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3914 - Minimum Operations to Make Array Non Decreasing

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3913 - Sort Vowels by Frequency

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3912 - Valid Elements in an Array

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3911 - K-th Smallest Remaining Even Integer in Subarray Queries

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3910 - Count Connected Subgraphs with Even Node Sum

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3909 - Compare Sums of Bitonic Parts

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3908 - Valid Digit Number

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3907 - Count Smaller Elements With Opposite Parity

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3906 - Count Good Integers on a Grid Path

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3905 - Multi Source Flood Fill

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3904 - Smallest Stable Index II

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3903 - Smallest Stable Index I

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3902 - Zigzag Level Sum of Binary Tree

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3901 - Good Subsequence Queries

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3900 - Longest Balanced Substring After One Swap

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3899 - Angles of a Triangle

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3898 - Find the Degree of Each Vertex

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3897 - Maximum Value of Concatenated Binary Segments

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3896 - Minimum Operations to Transform Array into Alternating Prime

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3895 - Count Digit Appearances

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3894 - Traffic Signal Color

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3893 - Maximum Team Size with Overlapping Intervals

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3892 - Minimum Operations to Achieve At Least K Peaks

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3891 - Minimum Increase to Maximize Special Indices

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3890 - Integers With Multiple Sum of Two Cubes

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3889 - Mirror Frequency Distance

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3888 - Minimum Operations to Make All Grid Elements Equal

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3887 - Incremental Even-Weighted Cycle Queries

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3886 - Sum of Sortable Integers

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3885 - Design Event Manager

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3884 - First Matching Character From Both Ends

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3883 - Count Non Decreasing Arrays With Given Digit Sums

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3882 - Minimum XOR Path in a Grid

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3881 - Direction Assignments with Exactly K Visible People

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3880 - Minimum Absolute Difference Between Two Values

Posted on May 8, 2026

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3879 - Maximum Distinct Path Sum in a Binary Tree

Posted on May 7, 2026

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3878 - Count Good Subarrays

Posted on May 6, 2026

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3877 - Minimum Removals to Achieve Target XOR

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3876 - Construct Uniform Parity Array II

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3875 - Construct Uniform Parity Array I

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3874 - Valid Subarrays With Exactly One Peak

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3873 - Maximum Points Activated with One Addition

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3872 - Longest Arithmetic Sequence After Changing At Most One Element

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3871 - Count Commas in Range II

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3870 - Count Commas in Range

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3869 - Count Fancy Numbers in a Range

Posted on April 27, 2026

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3868 - Minimum Cost to Equalize Arrays Using Swaps

Posted on April 26, 2026

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3867 - Sum of GCD of Formed Pairs

Posted on April 25, 2026

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3866 - First Unique Even Element

Posted on April 24, 2026

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3865 - Reverse K Subarrays

Posted on April 23, 2026

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3864 - Minimum Cost to Partition a Binary String

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3863 - Minimum Operations to Sort a String

Posted on April 21, 2026

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3862 - Find the Smallest Balanced Index

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3861 - Minimum Capacity Box

Posted on April 19, 2026

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3860 - Unique Email Groups

Posted on April 18, 2026

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3859 - Count Subarrays With K Distinct Integers

Posted on April 17, 2026

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3858 - Minimum Bitwise OR From Grid

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3857 - Minimum Cost to Split into Ones

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3856 - Trim Trailing Vowels

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3855 - Sum of K-Digit Numbers in a Range

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3854 - Minimum Operations to Make Array Parity Alternating

Posted on April 12, 2026

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3853 - Merge Close Characters

Posted on April 11, 2026

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3852 - Smallest Pair With Different Frequencies

Posted on April 10, 2026

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3851 - Maximum Requests Without Violating the Limit

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3850 - Count Sequences to K

Posted on April 8, 2026

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3849 - Maximum Bitwise XOR After Rearrangement

Posted on April 7, 2026

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3848 - Check Digitorial Permutation

Posted on April 6, 2026

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3847 - Find the Score Difference in a Game

Posted on April 5, 2026

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3846 - Total Distance to Type a String Using One Finger

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3845 - Maximum Subarray XOR with Bounded Range

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3844 - Longest Almost-Palindromic Substring

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3843 - First Element with Unique Frequency

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3842 - Toggle Light Bulbs

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3841 - Palindromic Path Queries in a Tree

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3840 - House Robber V

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3839 - Number of Prefix Connected Groups

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3838 - Weighted Word Mapping

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3837 - Delayed Count of Equal Elements

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3836 - Maximum Score Using Exactly K Pairs

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3835 - Count Subarrays With Cost Less Than or Equal to K

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3834 - Merge Adjacent Equal Elements

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3833 - Count Dominant Indices

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3832 - Find Users with Persistent Behavior Patterns

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3831 - Median of a Binary Search Tree Level

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3830 - Longest Alternating Subarray After Removing At Most One Element

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3829 - Design Ride Sharing System

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3828 - Final Element After Subarray Deletions

Posted on March 17, 2026

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3827 - Count Monobit Integers

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3826 - Minimum Partition Score

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3825 - Longest Strictly Increasing Subsequence With Non-Zero Bitwise AND

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3824 - Minimum K to Reduce Array Within Limit

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3823 - Reverse Letters Then Special Characters in a String

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3822 - Design Order Management System

Posted on March 11, 2026

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3821 - Find Nth Smallest Integer With K One Bits

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3820 - Pythagorean Distance Nodes in a Tree

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3819 - Rotate Non Negative Elements

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3818 - Minimum Prefix Removal to Make Array Strictly Increasing

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3817 - Good Indices in a Digit String

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3816 - Lexicographically Smallest String After Deleting Duplicate Characters

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3815 - Design Auction System

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3814 - Maximum Capacity Within Budget

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3813 - Vowel-Consonant Score

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3812 - Minimum Edge Toggles on a Tree

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3811 - Number of Alternating XOR Partitions

Posted on February 28, 2026

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3810 - Minimum Operations to Reach Target Array

Posted on February 27, 2026

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3809 - Best Reachable Tower

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3808 - Find Emotionally Consistent Users

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3807 - Minimum Cost to Repair Edges to Traverse a Graph

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3806 - Maximum Bitwise AND After Increment Operations

Posted on February 23, 2026

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3805 - Count Caesar Cipher Pairs

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3804 - Number of Centered Subarrays

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3803 - Count Residue Prefixes

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3802 - Number of Ways to Paint Sheets

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3801 - Minimum Cost to Merge Sorted Lists

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3800 - Minimum Cost to Make Two Binary Strings Equal

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3799 - Word Squares II

Posted on February 16, 2026

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3798 - Largest Even Number

Posted on February 15, 2026

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3797 - Count Routes to Climb a Rectangular Grid

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3796 - Find Maximum Value in a Constrained Sequence

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3795 - Minimum Subarray Length With Distinct Sum At Least K

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3794 - Reverse String Prefix

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3793 - Find Users with High Token Usage

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3792 - Sum of Increasing Product Blocks

Posted on February 9, 2026

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3791 - Number of Balanced Integers in a Range

Posted on February 8, 2026

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3790 - Smallest All-Ones Multiple

Posted on February 7, 2026

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3789 - Minimum Cost to Acquire Required Items

Posted on February 6, 2026

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3788 - Maximum Score of a Split

Posted on February 5, 2026

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3787 - Find Diameter Endpoints of a Tree

Posted on February 4, 2026

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3786 - Total Sum of Interaction Cost in Tree Groups

Posted on February 3, 2026

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3785 - Minimum Swaps to Avoid Forbidden Values

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3784 - Minimum Deletion Cost to Make All Characters Equal

Posted on February 1, 2026

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3783 - Mirror Distance of an Integer

Posted on January 31, 2026

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3782 - Last Remaining Integer After Alternating Deletion Operations

Posted on January 30, 2026

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3781 - Maximum Score After Binary Swaps

Posted on January 29, 2026

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3780 - Maximum Sum of Three Numbers Divisible by Three

Posted on January 28, 2026

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3779 - Minimum Number of Operations to Have Distinct Elements

Posted on January 27, 2026

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3778 - Minimum Distance Excluding One Maximum Weighted Edge

Posted on January 26, 2026

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3777 - Minimum Deletions to Make Alternating Substring

Posted on January 25, 2026

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3776 - Minimum Moves to Balance Circular Array

Posted on January 24, 2026

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3775 - Reverse Words With Same Vowel Count

Posted on January 23, 2026

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3774 - Absolute Difference Between Maximum and Minimum K Elements

Posted on January 22, 2026

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3773 - Maximum Number of Equal Length Runs

Posted on January 21, 2026

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3772 - Maximum Subgraph Score in a Tree

Posted on January 20, 2026

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3771 - Total Score of Dungeon Runs

Posted on January 19, 2026

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3770 - Largest Prime from Consecutive Prime Sum

Posted on January 18, 2026

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3769 - Sort Integers by Binary Reflection

Posted on January 17, 2026

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3768 - Minimum Inversion Count in Subarrays of Fixed Length

Posted on January 16, 2026

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3767 - Maximize Points After Choosing K Tasks

Posted on January 15, 2026

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3766 - Minimum Operations to Make Binary Palindrome

Posted on January 14, 2026

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3765 - Complete Prime Number

Posted on January 13, 2026

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3764 - Most Common Course Pairs

Posted on January 12, 2026

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3763 - Maximum Total Sum with Threshold Constraints

Posted on January 11, 2026

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3762 - Minimum Operations to Equalize Subarrays

Posted on January 10, 2026

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