CNoodle

摘要： Given an array of strings nums containing n unique binary strings each of length n, return a binary string of length n that does not appear in nums. I 阅读全文

摘要： Given the root of a binary tree, split the binary tree into two subtrees by removing one edge such that the product of the sums of the subtrees is max 阅读全文

摘要： Given an array nums, you are allowed to choose one element of nums and change it by any value in one move. Return the minimum difference between the l 阅读全文

摘要： Given an integer n, count the total number of digit 1 appearing in all non-negative integers less than or equal to n. Example 1: Input: n = 13 Output: 阅读全文

摘要： You are given a 0-indexed string s of even length n. The string consists of exactly n / 2 opening brackets '[' and n / 2 closing brackets ']'. A strin 阅读全文

摘要： Given an array of positive integers arr (not necessarily distinct), return the lexicographically largest permutation that is smaller than arr, that ca 阅读全文

摘要： You are given a 0-indexed integer array piles, where piles[i] represents the number of stones in the ith pile, and an integer k. You should apply the 阅读全文

摘要： Given a string s and an array of strings words, determine whether s is a prefix string of words. A string s is a prefix string of words if s can be ma 阅读全文

摘要： A super ugly number is a positive integer whose prime factors are in the array primes. Given an integer n and an array of integers primes, return the  阅读全文

摘要： You are playing a game involving a circular array of non-zero integers nums. Each nums[i] denotes the number of indices forward/backward you must move 阅读全文

摘要： The Tribonacci sequence Tn is defined as follows: T0 = 0, T1 = 1, T2 = 1, and Tn+3 = Tn + Tn+1 + Tn+2 for n >= 0. Given n, return the value of Tn. Exa 阅读全文

摘要： We start at some node in a directed graph, and every turn, we walk along a directed edge of the graph. If we reach a terminal node (that is, it has no 阅读全文

摘要： Given n points on a 2D plane, find if there is such a line parallel to y-axis that reflect the given points symmetrically, in other words, answer whet 阅读全文

摘要： You are given a string num, which represents a large integer. You are also given a 0-indexed integer array change of length 10 that maps each digit 0- 阅读全文

摘要： You are given a string s consisting of lowercase English letters, and an integer k. First, convert s into an integer by replacing each letter with its 阅读全文

摘要： You are given a string time in the form of hh:mm, where some of the digits in the string are hidden (represented by ?). The valid times are those incl 阅读全文

摘要： You are given an n x n binary matrix grid. You are allowed to change at most one 0 to be 1. Return the size of the largest island in grid after applyi 阅读全文

摘要： The beauty of a string is the difference in frequencies between the most frequent and least frequent characters. For example, the beauty of "abaacc" i 阅读全文

摘要： order and str are strings composed of lowercase letters. In order, no letter occurs more than once. order was sorted in some custom order previously. 阅读全文

摘要： You are given two positive integer arrays nums1 and nums2, both of length n. The absolute sum difference of arrays nums1 and nums2 is defined as the s 阅读全文