CNoodle

摘要： Given an array of unique integers, arr, where each integer arr[i] is strictly greater than 1. We make a binary tree using these integers, and each num 阅读全文

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

摘要： Given the binary representation of an integer as a string s, return the number of steps to reduce it to 1 under the following rules: If the current nu 阅读全文

摘要： Given a binary tree root and a linked list with head as the first node. Return True if all the elements in the linked list starting from the head corr 阅读全文

摘要： Given two strings: s1 and s2 with the same size, check if some permutation of string s1 can break some permutation of string s2 or vice-versa. In othe 阅读全文

摘要： Given the head of a singly linked list and an integer k, split the linked list into k consecutive linked list parts. The length of each part should be 阅读全文

摘要： There is a special square room with mirrors on each of the four walls. Except for the southwest corner, there are receptors on each of the remaining c 阅读全文

摘要： We are given a matrix with R rows and C columns has cells with integer coordinates (r, c), where 0 <= r < R and 0 <= c < C. Additionally, we are given 阅读全文

摘要： Given an array nums of integers, return the length of the longest arithmetic subsequence in nums. Note that: A subsequence is an array that can be der 阅读全文

摘要： Given an m x n binary matrix mat, return the number of special positions in mat. A position (i, j) is called special if mat[i][j] == 1 and all other e 阅读全文

摘要： Given a string s, return all the palindromic permutations (without duplicates) of it. Return an empty list if no palindromic permutation could be form 阅读全文

摘要： Given an array of integers nums, half of the integers in nums are odd, and the other half are even. Sort the array so that whenever nums[i] is odd, i  阅读全文

摘要： Given the coordinates of four points in 2D space p1, p2, p3 and p4, return true if the four points construct a square. The coordinate of a point pi is 阅读全文

摘要： You are given an n x n binary matrix grid where 1 represents land and 0 represents water. An island is a 4-directionally connected group of 1's not co 阅读全文

摘要： You are given an integer array cost where cost[i] is the cost of ith step on a staircase. Once you pay the cost, you can either climb one or two steps 阅读全文

摘要： Given the root of a binary tree, find the maximum value v for which there exist different nodes a and b where v = |a.val - b.val| and a is an ancestor 阅读全文

摘要： On an NxN chessboard, a knight starts at the r-th row and c-th column and attempts to make exactly K moves. The rows and columns are 0 indexed, so the 阅读全文

摘要： A polynomial linked list is a special type of linked list where every node represents a term in a polynomial expression. Each node has three attribute 阅读全文

摘要： Given an array of integers nums and an integer threshold, we will choose a positive integer divisor, divide all the array by it, and sum the division' 阅读全文

摘要： Given an integer array arr. You have to sort the integers in the array in ascending order by the number of 1's in their binary representation and in c 阅读全文