摘要： 题目如下： Given a m * n matrix of distinct numbers, return all lucky numbers in the matrix in any order. A lucky number is an element of the matrix such t 阅读全文

摘要： 题目如下： Given an undirected tree consisting of n vertices numbered from 1 to n. A frog starts jumping from the vertex 1. In one second, the frog jumps f 阅读全文

摘要： 题目如下： A company has n employees with a unique ID for each employee from 0 to n - 1. The head of the company has is the one with headID. Each employee 阅读全文

摘要： 题目如下： There is a room with n bulbs, numbered from 1 to n, arranged in a row from left to right. Initially, all the bulbs are turned off. At moment k ( 阅读全文

摘要： 题目如下： Given an integer n, return a string with n characters such that each character in such string occurs an odd number of times. The returned string 阅读全文

摘要： 题目如下： 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 hea 阅读全文

摘要： 题目如下： In a special ranking system, each voter gives a rank from highest to lowest to all teams participated in the competition. The ordering of teams 阅读全文

摘要： 题目如下： Given the array nums, for each nums[i] find out how many numbers in the array are smaller than it. That is, for each nums[i] you have to count t 阅读全文

摘要： 题目如下： Given an integer array of digits, return the largest multiple of three that can be formed by concatenating some of the given digits in any order 阅读全文

摘要： 题目如下： Given an integer num, find the closest two integers in absolute difference whose product equals num + 1 or num + 2. Return the two integers in a 阅读全文