LeetCode 37xx

LeetCode problems 3700–3799

82 items

LeetCode 37xx

# Problem Difficulty Time Notes
3700 Number of ZigZag Arrays II 🔴 Hard 46s The problem asks us to count the number of arrays of length n where…
3702 Longest Subsequence With Non-Zero Bitwise XOR 🟡 Medium 1m 18s We are given an integer array nums, and we must determine the maxim…
3703 Remove K-Balanced Substrings 🟡 Medium 1m 24s We are given a string s consisting only of '(' and ')', along with …
3704 Count No-Zero Pairs That Sum to N 🔴 Hard 41s The problem asks us to count all pairs of positive integers (a, b) …
3705 Find Golden Hour Customers 🟡 Medium 1m 14s This problem asks us to identify "golden hour customers" from a res…
3706 Maximum Distance Between Unequal Words in Array II 🟡 Medium 1m 30s We are given an array of strings called words. Our goal is to find …
3707 Equal Score Substrings 🟢 Easy 53s The problem asks us to determine if a given string s can be split i…
3708 Longest Fibonacci Subarray 🟡 Medium 1m 22s The problem gives us an array nums consisting of positive integers …
3709 Design Exam Scores Tracker 🟡 Medium 49s This problem asks us to design a system that tracks Alice's exam sc…
3710 Maximum Partition Factor 🔴 Hard 45s The problem asks us to split a set of n points in a 2D Cartesian pl…
3711 Maximum Transactions Without Negative Balance 🟡 Medium 1m 1s Here is a complete, detailed technical solution guide for LeetCode …
3712 Sum of Elements With Frequency Divisible by K 🟢 Easy 1m 6s The problem asks us to compute the sum of all elements in the array…
3714 Longest Balanced Substring II 🟡 Medium 1m 8s The problem gives us a string s that contains only three possible c…
3715 Sum of Perfect Square Ancestors 🔴 Hard 45s This problem asks us to compute a sum across all non-root nodes in …
3716 Find Churn Risk Customers 🟡 Medium 1m 15s This problem asks us to identify subscribers who appear likely to c…
3717 Minimum Operations to Make the Array Beautiful 🟡 Medium 54s Here is the complete, detailed technical solution guide for LeetCod…
3718 Smallest Missing Multiple of K 🟢 Easy 44s The problem asks us to find the smallest positive multiple of k tha…
3720 Lexicographically Smallest Permutation Greater Than Target 🟡 Medium 36s Before I write the full guide, I want to verify one important detai…
3721 Longest Balanced Subarray II 🔴 Hard 50s The problem requires us to find the length of the longest subarray …
3722 Lexicographically Smallest String After Reverse 🟡 Medium 40s The problem asks us to find the lexicographically smallest string a…
3723 Maximize Sum of Squares of Digits 🟡 Medium 58s The problem asks us to construct a positive integer n of exactly nu…
3724 Minimum Operations to Transform Array 🟡 Medium 46s This problem asks us to transform an array nums1 of length n into a…
3725 Count Ways to Choose Coprime Integers from Rows 🔴 Hard 42s The problem asks us to determine how many ways we can choose exactl…
3726 Remove Zeros in Decimal Representation 🟢 Easy 1m 5s The problem gives us a positive integer n and asks us to remove eve…
3727 Maximum Alternating Sum of Squares 🟡 Medium 1m 27s We are given an integer array nums, and we are allowed to rearrange…
3728 Stable Subarrays With Equal Boundary and Interior Sum 🟡 Medium 44s The problem asks us to count stable subarrays in an integer array c…
3729 Count Distinct Subarrays Divisible by K in Sorted Array 🔴 Hard 47s The problem asks us to find the number of distinct subarrays in a s…
3730 Maximum Calories Burnt from Jumps 🟡 Medium 1m 7s The problem asks us to determine the maximum total calories that ca…
3731 Find Missing Elements 🟢 Easy 1m 5s This problem asks us to reconstruct a missing sequence of integers …
3733 Minimum Time to Complete All Deliveries 🟡 Medium 35s This is a long, structured reference document. To make sure I targe…
3734 Lexicographically Smallest Palindromic Permutation Greater Than Target 🔴 Hard 3m 48s We are given two strings, s and target, of the same length n. The g…
3736 Minimum Moves to Equal Array Elements III 🟢 Easy 1m 1s The problem asks us to determine the minimum number of moves requir…
3737 Count Subarrays With Majority Element I 🟡 Medium 1m 6s Here is a comprehensive, detailed reference guide for LeetCode 3737…
3738 Longest Non-Decreasing Subarray After Replacing at Most One Element 🟡 Medium 4m 7s assert Solution().
3739 Count Subarrays With Majority Element II 🔴 Hard 57s Here’s a complete, detailed technical solution guide for LeetCode 3…
3741 Minimum Distance Between Three Equal Elements II 🟡 Medium 2m 40s The problem asks us to find three distinct indices (i, j, k) such t…
3742 Maximum Path Score in a Grid 🟡 Medium 48s This problem presents a grid of size m x n where each cell contains…
3743 Maximize Cyclic Partition Score 🔴 Hard 1m 34s We are given a cyclic array nums, which means the array is consider…
3744 Find Kth Character in Expanded String 🟡 Medium 1m 21s The problem gives us a string s containing one or more lowercase wo…
3745 Maximize Expression of Three Elements 🟢 Easy 1m 10s The problem gives us an integer array nums and asks us to choose th…
3746 Minimum String Length After Balanced Removals 🟡 Medium 36s Before I write the full guide, I want to verify one detail because …
3748 Count Stable Subarrays 🔴 Hard 52s The problem asks us to count "stable" subarrays within a given arra…
3749 Evaluate Valid Expressions 🔴 Hard 44s The problem presents a simplified version of evaluating nested math…
3750 Minimum Number of Flips to Reverse Binary String 🟢 Easy 5m 55s The problem gives us a positive integer n, and asks us to work with…
3751 Total Waviness of Numbers in Range I 🟡 Medium 1m 20s This problem asks us to compute the total waviness of every integer…
3754 Concatenate Non-Zero Digits and Multiply by Sum I 🟢 Easy 1m 2s The problem asks us to process an integer n and construct a new num…
3755 Find Maximum Balanced XOR Subarray Length 🟡 Medium 1m 25s This problem asks us to find the longest contiguous subarray that s…
3756 Concatenate Non-Zero Digits and Multiply by Sum II 🟡 Medium 21s Please provide the official LeetCode problem statement or confirm t…
3757 Number of Effective Subsequences 🔴 Hard 1m 7s Here’s a complete, detailed technical guide for LeetCode 3757 - Num…
3758 Convert Number Words to Digits 🟡 Medium 56s The problem asks us to parse a string s that contains lowercase Eng…
3759 Count Elements With at Least K Greater Values 🟡 Medium 1m 15s The problem asks us to count how many elements in an array have at …
3760 Maximum Substrings With Distinct Start 🟡 Medium 1m 16s The problem asks us to split a string into as many non-empty substr…
3761 Minimum Absolute Distance Between Mirror Pairs 🟡 Medium 2m 49s We are given an integer array nums. A pair of indices (i, j) is cal…
3762 Minimum Operations to Equalize Subarrays 🔴 Hard 2m 11s We are given an array nums and a fixed integer k. A single operatio…
3763 Maximum Total Sum with Threshold Constraints 🟡 Medium 52s The problem gives you two integer arrays, nums and threshold, each …
3764 Most Common Course Pairs 🔴 Hard 1m 35s The coursecompletions table records every course completed by every…
3765 Complete Prime Number 🟡 Medium 1m 19s The problem gives us a positive integer num and asks whether it is …
3766 Minimum Operations to Make Binary Palindrome 🟡 Medium 43s This problem asks us to find the minimum number of increment or dec…
3767 Maximize Points After Choosing K Tasks 🟡 Medium 1m 3s The problem gives two integer arrays, technique1 and technique2, ea…
3768 Minimum Inversion Count in Subarrays of Fixed Length 🔴 Hard 1m 36s We are given an array nums of length n and an integer k. For every …
3769 Sort Integers by Binary Reflection 🟢 Easy 41s This problem asks us to sort an array of positive integers based on…
3770 Largest Prime from Consecutive Prime Sum 🟡 Medium 1m 26s The problem gives us an integer n and asks us to find the largest p…
3771 Total Score of Dungeon Runs 🟡 Medium 55s The problem describes a dungeon with n rooms, where entering room i…
3772 Maximum Subgraph Score in a Tree 🔴 Hard 52s The problem asks us to compute, for each node in a tree, the maximu…
3773 Maximum Number of Equal Length Runs 🟡 Medium 59s The problem asks us to analyze a string s consisting of lowercase E…
3774 Absolute Difference Between Maximum and Minimum K Elements 🟢 Easy 3m 7s The problem asks us to calculate the absolute difference between th…
3775 Reverse Words With Same Vowel Count 🟡 Medium 48s The problem requires processing a string s consisting of lowercase …
3778 Minimum Distance Excluding One Maximum Weighted Edge 🟡 Medium 1m 56s We are given a connected, weighted, undirected graph with n nodes n…
3779 Minimum Number of Operations to Have Distinct Elements 🟡 Medium 1m 29s The problem gives us an integer array nums and defines a very speci…
3780 Maximum Sum of Three Numbers Divisible by Three 🟡 Medium 1m 2s Here is a comprehensive, detailed solution guide for LeetCode 3780 …
3781 Maximum Score After Binary Swaps 🟡 Medium 33s Before I write the full guide, I need one clarification: can you co…
3782 Last Remaining Integer After Alternating Deletion Operations 🔴 Hard 29s Before I write the full guide, I want to confirm one critical detai…
3784 Minimum Deletion Cost to Make All Characters Equal 🟡 Medium 47s The problem asks us to minimize the total cost of deleting characte…
3786 Total Sum of Interaction Cost in Tree Groups 🔴 Hard 34s I can do this, but I need the actual problem details for LeetCode 3…
3788 Maximum Score of a Split 🟡 Medium 57s The problem asks us to maximize a "score" obtained by splitting an …
3789 Minimum Cost to Acquire Required Items 🟡 Medium 1m 8s This problem asks us to determine the minimum cost required to acqu…
3790 Smallest All-Ones Multiple 🟡 Medium 1m 10s This problem asks us to find the smallest positive integer composed…
3791 Number of Balanced Integers in a Range 🔴 Hard 55s Here is the full, detailed technical solution guide for LeetCode 37…
3792 Sum of Increasing Product Blocks 🟡 Medium 1m 6s The problem defines a sequence of blocks, where each block contains…
3794 Reverse String Prefix 🟢 Easy 1m 7s This problem gives us a string s and an integer k. Our task is to r…
3795 Minimum Subarray Length With Distinct Sum At Least K 🟡 Medium 7m 19s This problem asks us to find the shortest contiguous subarray whose…
3799 Word Squares II 🟡 Medium 5m 13s We are given an array of distinct 4-letter words. Our goal is to co…
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LeetCode 3700 - Number of ZigZag Arrays II

The problem asks us to count the number of arrays of length n where each element is in the range [l, r], no two consecutive elements are equal, and no three consecutive elements are strictly increasing or strictly decreasing. These arrays are termed ZigZag arrays.
leetcode Hard math dynamic-programming May 30, 2026
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LeetCode 3702 - Longest Subsequence With Non-Zero Bitwise XOR

We are given an integer array nums, and we must determine the maximum possible length of a subsequence whose bitwise XOR is not equal to zero. A subsequence is formed by deleting zero or more elements from the array while preserving the relative order of the remaining elements.
leetcode Medium array bit-manipulation May 30, 2026
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LeetCode 3703 - Remove K-Balanced Substrings

We are given a string s consisting only of '(' and ')', along with an integer k. A substring is considered k-balanced if it is exactly: For example: - k = 1 → "()" - k = 2 → "(())" - k = 3 → "((()))" The operation is not performed just once. Instead, we repeatedly: 1.
leetcode Medium string stack simulation May 30, 2026
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LeetCode 3704 - Count No-Zero Pairs That Sum to N

The problem asks us to count all pairs of positive integers (a, b) such that their sum equals a given integer n and neither a nor b contains the digit 0 in their decimal representation. These integers are called no-zero integers.
leetcode Hard math dynamic-programming May 30, 2026
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LeetCode 3705 - Find Golden Hour Customers

This problem asks us to identify "golden hour customers" from a restaurant's order history. A golden hour customer is defined as someone who consistently orders during peak hours and maintains high satisfaction.
leetcode Medium May 30, 2026
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LeetCode 3706 - Maximum Distance Between Unequal Words in Array II

We are given an array of strings called words. Our goal is to find two different indices i and j such that the strings at those positions are different, meaning words[i] != words[j].
leetcode Medium array string May 30, 2026
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LeetCode 3707 - Equal Score Substrings

The problem asks us to determine if a given string s can be split into two non-empty substrings such that the sum of the alphabetic positions of characters in the left substring is equal to the sum in the right substring.
leetcode Easy string prefix-sum May 30, 2026
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LeetCode 3708 - Longest Fibonacci Subarray

The problem gives us an array nums consisting of positive integers and asks us to find the length of the longest contiguous subarray that satisfies the Fibonacci property. A subarray is a contiguous segment of the original array.
leetcode Medium array May 30, 2026
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LeetCode 3709 - Design Exam Scores Tracker

This problem asks us to design a system that tracks Alice's exam scores over time and efficiently computes the total score for any given time interval.
leetcode Medium array binary-search design prefix-sum May 30, 2026
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LeetCode 3710 - Maximum Partition Factor

The problem asks us to split a set of n points in a 2D Cartesian plane into exactly two non-empty groups, such that the minimum Manhattan distance among all pairs of points within each group (the partition factor) is maximized.
leetcode Hard array binary-search depth-first-search breadth-first-search union-find graph-theory May 30, 2026
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LeetCode 3711 - Maximum Transactions Without Negative Balance

Here is a complete, detailed technical solution guide for LeetCode 3711 - Maximum Transactions Without Negative Balance, following your formatting instructions precisely. The problem provides an array transactions of integers representing sequential money movements in an account.
leetcode Medium array greedy heap-(priority-queue) May 30, 2026
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LeetCode 3712 - Sum of Elements With Frequency Divisible by K

The problem asks us to compute the sum of all elements in the array whose total frequency is divisible by a given integer k. To understand the requirement clearly, we need to focus on two important details: First, we must determine how many times each number appears in the array.
leetcode Easy array hash-table counting May 30, 2026
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LeetCode 3714 - Longest Balanced Substring II

The problem gives us a string s that contains only three possible characters: 'a', 'b', and 'c'. We must find the longest substring where every distinct character in that substring appears the same number of times.
leetcode Medium hash-table string prefix-sum May 30, 2026
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LeetCode 3715 - Sum of Perfect Square Ancestors

This problem asks us to compute a sum across all non-root nodes in a tree based on ancestor relationships and the property of perfect squares. We are given a rooted tree of n nodes, represented as an edge list. Each node has a positive integer value from the nums array.
leetcode Hard array hash-table math tree depth-first-search counting number-theory May 30, 2026
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LeetCode 3716 - Find Churn Risk Customers

This problem asks us to identify subscribers who appear likely to churn based on their subscription history. The data is stored in the subscriptionevents table, where each row represents a subscription-related action performed by a user.
leetcode Medium May 30, 2026
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LeetCode 3717 - Minimum Operations to Make the Array Beautiful

Here is the complete, detailed technical solution guide for LeetCode 3717 - Minimum Operations to Make the Array Beautiful following your exact formatting rules. The problem asks us to transform an integer array nums into a beautiful array.
leetcode Medium array dynamic-programming May 30, 2026
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LeetCode 3718 - Smallest Missing Multiple of K

The problem asks us to find the smallest positive multiple of k that is not present in a given integer array nums. In other words, if we consider the infinite sequence of numbers k, 2k, 3k, 4k…, we need to identify the first number in this sequence that does not appear in nums.
leetcode Easy array hash-table May 30, 2026
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LeetCode 3720 - Lexicographically Smallest Permutation Greater Than Target

Before I write the full guide, I want to verify one important detail: LeetCode 3720 appears to be a very recent problem, and the exact intended optimal approach depends on the precise judge behavior and hidden constraints.
leetcode Medium hash-table string greedy counting enumeration May 30, 2026
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LeetCode 3721 - Longest Balanced Subarray II

The problem requires us to find the length of the longest subarray in an integer array nums where the count of distinct even numbers equals the count of distinct odd numbers.
leetcode Hard array hash-table divide-and-conquer segment-tree prefix-sum May 30, 2026
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LeetCode 3722 - Lexicographically Smallest String After Reverse

The problem asks us to find the lexicographically smallest string after performing exactly one reverse operation on a contiguous prefix or suffix of a given string s. The string consists only of lowercase English letters and can have a length up to 1000 characters.
leetcode Medium two-pointers binary-search enumeration May 30, 2026
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LeetCode 3723 - Maximize Sum of Squares of Digits

The problem asks us to construct a positive integer n of exactly num digits such that the sum of its digits equals sum.
leetcode Medium math greedy May 30, 2026
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LeetCode 3724 - Minimum Operations to Transform Array

This problem asks us to transform an array nums1 of length n into another array nums2 of length n + 1 using the minimum number of operations. The allowed operations are increasing or decreasing any element of nums1 by 1, or appending any element of nums1 to the end of the array.
leetcode Medium array greedy May 30, 2026
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LeetCode 3725 - Count Ways to Choose Coprime Integers from Rows

The problem asks us to determine how many ways we can choose exactly one number from each row of a given m x n matrix such that the greatest common divisor (GCD) of all chosen numbers is 1.
leetcode Hard array math dynamic-programming matrix combinatorics number-theory May 30, 2026
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LeetCode 3726 - Remove Zeros in Decimal Representation

The problem gives us a positive integer n and asks us to remove every digit '0' from its decimal representation. After all zero digits have been removed, we must return the resulting value as an integer. In other words, we first view the number as a sequence of decimal digits.
leetcode Easy math simulation May 30, 2026
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LeetCode 3727 - Maximum Alternating Sum of Squares

We are given an integer array nums, and we are allowed to rearrange its elements in any order before computing a score. The score of a rearranged array arr is defined as: The sign alternates between positive and negative positions.
leetcode Medium array greedy sorting May 30, 2026
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LeetCode 3728 - Stable Subarrays With Equal Boundary and Interior Sum

The problem asks us to count stable subarrays in an integer array capacity. A subarray capacity[l..r] is stable if it satisfies two conditions: its length is at least 3, and the first and last elements are each equal to the sum of the elements strictly between them.
leetcode Medium array hash-table prefix-sum May 30, 2026
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LeetCode 3729 - Count Distinct Subarrays Divisible by K in Sorted Array

The problem asks us to find the number of distinct subarrays in a sorted array nums such that the sum of elements in the subarray is divisible by a given integer k.
leetcode Hard array hash-table prefix-sum May 30, 2026
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LeetCode 3730 - Maximum Calories Burnt from Jumps

The problem asks us to determine the maximum total calories that can be burned while visiting every block exactly once in an arbitrary order. We are given an integer array heights, where heights[i] represents the height of a block.
leetcode Medium array two-pointers greedy sorting May 30, 2026
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LeetCode 3731 - Find Missing Elements

This problem asks us to reconstruct a missing sequence of integers from a partially incomplete array. We are given an integer array nums containing unique values, and we know an important fact: the array originally contained every integer in a continuous range, but some…
leetcode Easy array hash-table sorting May 30, 2026
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LeetCode 3733 - Minimum Time to Complete All Deliveries

This is a long, structured reference document. To make sure I target the correct problem and avoid producing an incorrect guide, I want to verify one thing first: Can you confirm the exact LeetCode problem number/title?
leetcode Medium math binary-search May 30, 2026
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LeetCode 3734 - Lexicographically Smallest Palindromic Permutation Greater Than Target

We are given two strings, s and target, of the same length n. The goal is to rearrange the characters of s into a palindrome and then choose, among all possible palindromic permutations, the lexicographically smallest one that is strictly greater than target.
leetcode Hard two-pointers string enumeration May 30, 2026
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LeetCode 3736 - Minimum Moves to Equal Array Elements III

The problem asks us to determine the minimum number of moves required to make every element in an integer array equal. A move consists of selecting one element and increasing it by exactly 1. We are not allowed to decrease values, and we can only increment elements.
leetcode Easy array math May 30, 2026
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LeetCode 3737 - Count Subarrays With Majority Element I

Here is a comprehensive, detailed reference guide for LeetCode 3737 - Count Subarrays With Majority Element I, following your formatting requirements exactly. The problem provides an integer array nums and a target integer.
leetcode Medium array hash-table divide-and-conquer segment-tree merge-sort counting prefix-sum May 30, 2026
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LeetCode 3738 - Longest Non-Decreasing Subarray After Replacing at Most One Element

assert Solution().
leetcode Medium array dynamic-programming May 31, 2026
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LeetCode 3739 - Count Subarrays With Majority Element II

Here’s a complete, detailed technical solution guide for LeetCode 3739 - Count Subarrays With Majority Element II following your requested format. The problem asks us to count the number of contiguous subarrays in which a given target element is the majority element.
leetcode Hard array hash-table divide-and-conquer segment-tree merge-sort prefix-sum May 30, 2026
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LeetCode 3741 - Minimum Distance Between Three Equal Elements II

The problem asks us to find three distinct indices (i, j, k) such that the values at those positions are identical: Among all such valid triples, we must compute the minimum possible distance, where the distance is defined as: If no value appears at least three times, then…
leetcode Medium array hash-table May 30, 2026
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LeetCode 3742 - Maximum Path Score in a Grid

This problem presents a grid of size m x n where each cell contains a value of 0, 1, or 2. Each cell contributes both a score and a cost: a cell with value 0 adds 0 to both score and cost, a cell with value 1 adds 1 to score and 1 to cost, and a cell with value 2 adds 2 to…
leetcode Medium array dynamic-programming matrix May 30, 2026
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LeetCode 3743 - Maximize Cyclic Partition Score

We are given a cyclic array nums, which means the array is considered to wrap around from the last element back to the first element. We want to partition the entire cycle into at most k contiguous subarrays.
leetcode Hard array dynamic-programming May 30, 2026
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LeetCode 3744 - Find Kth Character in Expanded String

The problem gives us a string s containing one or more lowercase words separated by single spaces. From this original string, we conceptually build a new string t using a special expansion rule.
leetcode Medium string May 30, 2026
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LeetCode 3745 - Maximize Expression of Three Elements

The problem gives us an integer array nums and asks us to choose three elements a, b, and c from distinct indices such that the expression: is as large as possible. The important detail is that the three elements must come from different positions in the array.
leetcode Easy array greedy sorting enumeration May 30, 2026
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LeetCode 3746 - Minimum String Length After Balanced Removals

Before I write the full guide, I want to verify one detail because this appears to be a very new LeetCode problem and correctness matters here.
leetcode Medium string stack counting May 30, 2026
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LeetCode 3748 - Count Stable Subarrays

The problem asks us to count "stable" subarrays within a given array nums. A subarray is stable if it contains no inversions, which means that for any two indices i < j in the subarray, nums[i] <= nums[j]. Essentially, a stable subarray is non-decreasing.
leetcode Hard array binary-search prefix-sum May 30, 2026
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LeetCode 3749 - Evaluate Valid Expressions

The problem presents a simplified version of evaluating nested mathematical expressions in string format. The input expression is either a single integer literal, which may be negative, or a nested operation of the form op(a,b) where op is one of the four basic arithmetic…
leetcode Hard hash-table math string divide-and-conquer stack May 30, 2026
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LeetCode 3750 - Minimum Number of Flips to Reverse Binary String

The problem gives us a positive integer n, and asks us to work with its binary representation. First, we convert n into a binary string s without leading zeros. Then, we compute the reverse of that binary string.
leetcode Easy math two-pointers string bit-manipulation May 30, 2026
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LeetCode 3751 - Total Waviness of Numbers in Range I

This problem asks us to compute the total waviness of every integer in an inclusive range [num1, num2]. For a single number, waviness is defined as the number of digits that are either peaks or valleys. A digit is a peak if it is strictly larger than both adjacent digits.
leetcode Medium math dynamic-programming enumeration May 30, 2026
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LeetCode 3754 - Concatenate Non-Zero Digits and Multiply by Sum I

The problem asks us to process an integer n and construct a new number using only its non-zero digits. These digits must remain in the same order in which they originally appear.
leetcode Easy math May 30, 2026
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LeetCode 3755 - Find Maximum Balanced XOR Subarray Length

This problem asks us to find the longest contiguous subarray that simultaneously satisfies two independent conditions: 1. The bitwise XOR of all elements in the subarray is equal to 0. 2. The subarray contains an equal number of even and odd elements.
leetcode Medium array hash-table bit-manipulation prefix-sum May 30, 2026
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LeetCode 3756 - Concatenate Non-Zero Digits and Multiply by Sum II

Please provide the official LeetCode problem statement or confirm the exact problem details for LeetCode 3756 - Concatenate Non-Zero Digits and Multiply by Sum II.
leetcode Medium math string prefix-sum May 30, 2026
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LeetCode 3757 - Number of Effective Subsequences

Here’s a complete, detailed technical guide for LeetCode 3757 - Number of Effective Subsequences, following your formatting instructions exactly. The problem gives us an array of integers, nums, and asks us to determine the number of effective subsequences.
leetcode Hard array math dynamic-programming bit-manipulation combinatorics May 30, 2026
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LeetCode 3758 - Convert Number Words to Digits

The problem asks us to parse a string s that contains lowercase English letters and may include concatenated English words representing digits from 0 to 9.
leetcode Medium string trie May 30, 2026
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LeetCode 3759 - Count Elements With at Least K Greater Values

The problem asks us to count how many elements in an array have at least k values that are strictly greater than them. More concretely, for every element nums[i], we need to determine how many numbers in the array are larger than nums[i].
leetcode Medium array binary-search divide-and-conquer sorting quickselect May 30, 2026
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LeetCode 3760 - Maximum Substrings With Distinct Start

The problem asks us to split a string into as many non-empty substrings as possible, with one important restriction: the first character of every substring must be different from the first character of every other substring.
leetcode Medium hash-table string May 30, 2026
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LeetCode 3761 - Minimum Absolute Distance Between Mirror Pairs

We are given an integer array nums. A pair of indices (i, j) is called a mirror pair if: - i < j - reverse(nums[i]) == nums[j] The operation reverse(x) reverses the decimal digits of x and removes any leading zeros that appear after reversal.
leetcode Medium array hash-table math May 31, 2026
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LeetCode 3762 - Minimum Operations to Equalize Subarrays

We are given an array nums and a fixed integer k. A single operation allows us to choose any element and either increase it by exactly k or decrease it by exactly k. We may perform as many operations as needed. For each query [l, r], we only consider the subarray nums[l..r].
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LeetCode 3763 - Maximum Total Sum with Threshold Constraints

The problem gives you two integer arrays, nums and threshold, each of length n. Each index i represents a value nums[i] you can add to a running total, but you can only choose that index when the current step is at least threshold[i].
leetcode Medium array greedy sorting heap-(priority-queue) May 30, 2026
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LeetCode 3764 - Most Common Course Pairs

The coursecompletions table records every course completed by every user. Each row contains the user, the course they completed, the completion date, and the rating they gave that course. The problem asks us to identify common learning pathways among strong students.
leetcode Hard May 30, 2026
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LeetCode 3765 - Complete Prime Number

The problem gives us a positive integer num and asks whether it is a Complete Prime Number. A number qualifies as a Complete Prime Number if every prefix and every suffix of its decimal representation is prime. For a number with digits d1 d2 d3 ...
leetcode Medium math enumeration number-theory May 30, 2026
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LeetCode 3766 - Minimum Operations to Make Binary Palindrome

This problem asks us to find the minimum number of increment or decrement operations needed to convert each number in a list into a binary palindrome. A binary palindrome is a number whose binary representation reads the same forwards and backwards once leading zeros are removed.
leetcode Medium array two-pointers binary-search bit-manipulation May 30, 2026
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LeetCode 3767 - Maximize Points After Choosing K Tasks

The problem gives two integer arrays, technique1 and technique2, each of length n, representing two ways to complete n tasks. Completing the ith task with technique1 yields technique1[i] points, while using technique2 yields technique2[i] points.
leetcode Medium array greedy sorting heap-(priority-queue) May 30, 2026
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LeetCode 3768 - Minimum Inversion Count in Subarrays of Fixed Length

We are given an array nums of length n and an integer k. For every contiguous subarray of length k, we must compute its inversion count, then return the smallest inversion count among all such windows.
leetcode Hard array segment-tree sliding-window May 30, 2026
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LeetCode 3769 - Sort Integers by Binary Reflection

This problem asks us to sort an array of positive integers based on a transformation called binary reflection. The binary reflection of a number is obtained by converting the number to its binary representation, reversing the order of the bits (ignoring leading zeros), and…
leetcode Easy array sorting May 30, 2026
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LeetCode 3770 - Largest Prime from Consecutive Prime Sum

The problem gives us an integer n and asks us to find the largest prime number that satisfies two conditions: 1. It is less than or equal to n. 2. It can be written as the sum of one or more consecutive prime numbers starting from 2.
leetcode Medium array math number-theory May 30, 2026
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LeetCode 3771 - Total Score of Dungeon Runs

The problem describes a dungeon with n rooms, where entering room i reduces your health points by damage[i]. After taking this damage, if your remaining health is at least requirement[i], you earn 1 point for that room.
leetcode Medium array binary-search prefix-sum May 30, 2026
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LeetCode 3772 - Maximum Subgraph Score in a Tree

The problem asks us to compute, for each node in a tree, the maximum score of a connected subgraph that includes that node. The tree is represented as an undirected graph with n nodes and n - 1 edges. Each node has a value indicating whether it is good (1) or bad (0).
leetcode Hard array dynamic-programming tree depth-first-search May 30, 2026
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LeetCode 3773 - Maximum Number of Equal Length Runs

The problem asks us to analyze a string s consisting of lowercase English letters and identify runs, which are contiguous sequences of identical characters that cannot be extended further. For example, in "aaabaaa", the runs are "aaa", "b", and "aaa".
leetcode Medium hash-table string counting May 30, 2026
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LeetCode 3774 - Absolute Difference Between Maximum and Minimum K Elements

The problem asks us to calculate the absolute difference between the sum of the k largest elements and the sum of the k smallest elements in a given array nums.
leetcode Easy array sorting May 31, 2026
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LeetCode 3775 - Reverse Words With Same Vowel Count

The problem requires processing a string s consisting of lowercase English words separated by single spaces. The first task is to count the number of vowels in the first word.
leetcode Medium two-pointers string simulation May 30, 2026
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LeetCode 3778 - Minimum Distance Excluding One Maximum Weighted Edge

We are given a connected, weighted, undirected graph with n nodes numbered from 0 to n - 1. Every edge is represented as [u, v, w], meaning there is a bidirectional edge between nodes u and v with positive weight w.
leetcode Medium May 30, 2026
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LeetCode 3779 - Minimum Number of Operations to Have Distinct Elements

The problem gives us an integer array nums and defines a very specific operation: in one move, we remove the first three elements of the current array. If fewer than three elements remain, we remove everything that is left.
leetcode Medium array hash-table May 30, 2026
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LeetCode 3780 - Maximum Sum of Three Numbers Divisible by Three

Here is a comprehensive, detailed solution guide for LeetCode 3780 - Maximum Sum of Three Numbers Divisible by Three, following your requested format: The problem asks us to select exactly three integers from the given integer array nums such that the sum of those three…
leetcode Medium array greedy sorting heap-(priority-queue) May 30, 2026
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LeetCode 3781 - Maximum Score After Binary Swaps

Before I write the full guide, I need one clarification: can you confirm the exact LeetCode 3781 problem details or provide the official title/link?
leetcode Medium array string greedy heap-(priority-queue) May 30, 2026
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LeetCode 3782 - Last Remaining Integer After Alternating Deletion Operations

Before I write the full guide, I want to confirm one critical detail because the examples appear inconsistent with the stated operations.
leetcode Hard math recursion May 30, 2026
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LeetCode 3784 - Minimum Deletion Cost to Make All Characters Equal

The problem asks us to minimize the total cost of deleting characters from a string such that the resulting string contains only one unique character.
leetcode Medium array hash-table string enumeration May 30, 2026
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LeetCode 3786 - Total Sum of Interaction Cost in Tree Groups

I can do this, but I need the actual problem details for LeetCode 3786 - Total Sum of Interaction Cost in Tree Groups to ensure the algorithm, proof, and code are correct.
leetcode Hard array tree depth-first-search May 30, 2026
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LeetCode 3788 - Maximum Score of a Split

The problem asks us to maximize a "score" obtained by splitting an integer array nums at a valid index i. For each split index i, the score is calculated as the sum of all elements from the beginning of the array up to i (prefixSum) minus the minimum value in the remaining…
leetcode Medium array prefix-sum May 30, 2026
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LeetCode 3789 - Minimum Cost to Acquire Required Items

This problem asks us to determine the minimum cost required to acquire a set of items that satisfy two separate type requirements. We have three types of items: type 1, type 2, and type 3.
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LeetCode 3790 - Smallest All-Ones Multiple

This problem asks us to find the smallest positive integer composed entirely of the digit 1 that is divisible by a given integer k. The input k is guaranteed to be between 2 and 100,000.
leetcode Medium hash-table math May 30, 2026
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LeetCode 3791 - Number of Balanced Integers in a Range

Here is the full, detailed technical solution guide for LeetCode 3791 - Number of Balanced Integers in a Range, following your requested structure. The problem asks us to count all integers between low and high inclusive that are balanced.
leetcode Hard dynamic-programming May 30, 2026
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LeetCode 3792 - Sum of Increasing Product Blocks

The problem defines a sequence of blocks, where each block contains the product of a consecutive range of integers.
leetcode Medium math simulation May 30, 2026
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LeetCode 3794 - Reverse String Prefix

This problem gives us a string s and an integer k. Our task is to reverse only the first k characters of the string while leaving the remaining characters unchanged.
leetcode Easy two-pointers string May 30, 2026
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LeetCode 3795 - Minimum Subarray Length With Distinct Sum At Least K

This problem asks us to find the shortest contiguous subarray whose distinct-value sum is at least k. The important detail is that we do not sum all elements in the subarray.
leetcode Medium array hash-table sliding-window May 30, 2026
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LeetCode 3799 - Word Squares II

We are given an array of distinct 4-letter words. Our goal is to construct every valid word square consisting of exactly four different words: - top forms the top row. - bottom forms the bottom row. - left forms the left column. - right forms the right column.
leetcode Medium array string backtracking sorting enumeration May 30, 2026