CNoodle

摘要： Every email consists of a local name and a domain name, separated by the @ sign. For example, in alice@leetcode.com, alice is the local name, and leet 阅读全文

摘要： Given an integer array nums and an integer k, return the number of non-empty subarrays that have a sum divisible by k. A subarray is a contiguous part 阅读全文

摘要： Given an array of integers preorder, which represents the preorder traversal of a BST (i.e., binary search tree), construct the tree and return its ro 阅读全文

摘要： You have intercepted a secret message encoded as a string of numbers. The message is decoded via the following mapping: "1" -> 'A' "2" -> 'B' ... "25" 阅读全文

摘要： Given two integer arrays inorder and postorder where inorder is the inorder traversal of a binary tree and postorder is the postorder traversal of the 阅读全文

摘要： Given a m * n matrix of ones and zeros, return how many square submatrices have all ones. Example 1: Input: matrix = [ [0,1,1,1], [1,1,1,1], [0,1,1,1] 阅读全文

摘要： Given a string num that contains only digits and an integer target, return all possibilities to add the binary operators '+', '-', or '*' between the 阅读全文

摘要： Design an algorithm that collects daily price quotes for some stock and returns the span of that stock's price for the current day. The span of the st 阅读全文

摘要： Given the string s, return the size of the longest substring containing each vowel an even number of times. That is, 'a', 'e', 'i', 'o', and 'u' must 阅读全文

摘要： Given two strings s1 and s2, return true if s2 contains a permutation of s1, or false otherwise. In other words, return true if one of s1's permutatio 阅读全文

摘要： Given an integer array nums, find a subarray that has the largest product, and return the product. The test cases are generated so that the answer wil 阅读全文

摘要： Given the array favoriteCompanies where favoriteCompanies[i] is the list of favorites companies for the ith person (indexed from 0). Return the indice 阅读全文

摘要： Implement a basic calculator to evaluate a simple expression string. The expression string contains only non-negative integers, +, -, *, / operators a 阅读全文

摘要： Implement a basic calculator to evaluate a simple expression string. The expression string may contain open ( and closing parentheses ), the plus + or 阅读全文

摘要： Evaluate the value of an arithmetic expression in Reverse Polish Notation. Valid operators are +, -, *, and /. Each operand may be an integer or anoth 阅读全文

摘要： Given a circular integer array nums of length n, return the maximum possible sum of a non-empty subarray of nums. A circular array means the end of th 阅读全文

摘要： Design a time-based key-value data structure that can store multiple values for the same key at different time stamps and retrieve the key's value at 阅读全文

摘要： Given strings s1, s2, and s3, find whether s3 is formed by an interleaving of s1 and s2. An interleaving of two strings s and t is a configuration whe 阅读全文

摘要： In an alien language, surprisingly, they also use English lowercase letters, but possibly in a different order. The order of the alphabet is some perm 阅读全文

摘要： Given a rows x cols binary matrix filled with 0's and 1's, find the largest rectangle containing only 1's and return its area. Example 1: Input: matri 阅读全文