Problem You are given two strings word1 and word2. A string x is called valid if x can be rearranged to have word2 as a prefi...

Problem You are given an integer array nums. You can do the following operation on the array at most once: Choose any intege...

Problem 跟 3042. Count Prefix and Suffix Pairs I 一模一样，但单词数量从 50 提升到 10⁵，同时单词的长度也从 10 提升到 10⁵。 https://leetcode.com/problems/co...

Problem You are given a 0-indexed string array words. Let’s define a boolean function isPrefixAndSuffix that takes two string...

Problem You are given a string num representing a large integer. An integer is good if it meets the following conditions: It...

Problem Given an array of string words, return all strings in words that is a substring of another word. You can return the a...

Problem You are given a 0-indexed string s typed by a user. Changing a key is defined as using a key different from the last ...

Problem Given an array of integers, return the maximum sum for a non-empty subarray (contiguous elements) with at most one el...

Problem You have n boxes. You are given a binary string boxes of length n, where boxes[i] is '0' if the iᵗʰ box is empty, and...

Problem Alice manages a company and has rented some floors of a building as office space. Alice has decided some of these flo...

Problem You are given a string s of lowercase English letters and a 2D integer array shifts where shifts[i] = [startᵢ, endᵢ, ...

Problem You are given a string s of lowercase English letters and an integer array shifts of the same length. Call the shift(...

Problem There is an ATM machine that stores banknotes of 5 denominations: 20, 50, 100, 200, and 500 dollars. Initially the AT...

Problem 唯一中间众数子序列。 Given an integer array nums, find the number of subsequences of size 5 of nums with a unique middle mode...

跟 3398. Smallest Substring With Identical Characters I 一模一样，只不过 s 的长度上限从 1000 增加到 10⁵。 https://leetcode.com/problems/smallest...

Problem You are given a binary string s of length n and an integer numOps. You are allowed to perform the following operation...

Problem Given a string s, return the number of unique palindromes of length three that are a subsequence of s. Note that even...

Problem You are given three integers n, m, k. A good array arr of size n is defined as follows: Each element in arr is in th...

Problem Given an integer array nums, find three numbers whose product is maximum and return the maximum product. https://leet...

Problem Given an unsorted array of integers nums, return the length of the longest continuous increasing subsequence (i.e. su...

Problem Given a list of dominoes, dominoes[i] = [a, b] is equivalent to dominoes[j] = [c, d] if and only if either (a == c an...

Problem Given a 2D grid of size m x n and an integer k. You need to shift the grid k times. In one shift operation: Element ...

Problem Given an integer n, return a string with n characters such that each character in such string occurs an odd number of...

Problem Given an binary array nums and an integer k, return true if all 1’s are at least k places away from each other, other...

Problem You are given a 0-indexed integer array nums of length n. nums contains a valid split at index i if the following are...

Problem You are playing the following Nim Game with your friend: Initially, there is a heap of stones on the table. You and ...

Problem Given a string columnTitle that represents the column title as appears in an Excel sheet, return its corresponding co...

Problem Given an integer columnNumber, return its corresponding column title as it appears in an Excel sheet. For example: A...

Problem We had some 2-dimensional coordinates, like "(1, 3)" or "(2, 0.5)". Then, we removed all commas, ...

Problem You are given an array of intervals, where intervals[i] = [startᵢ, endᵢ] and each startᵢ is unique. The right interva...

Problem A k-booking happens when k events have some non-empty intersection (i.e., there is some time that is common to all k ...

Problem You are implementing a program to use as your calendar. We can add a new event if adding the event will not cause a t...