[LeetCode]319. Bulb Switcher 解题报告(Python) 标签(空格分隔): LeetCode 题目地址:https://leetcode.com/problems/bulb-switcher/description/ 题目描述: There are n bulbs that are initially off. You first turn on all the bulbs. Then, you turn off every second bulb. On the t…

319. Bulb Switcher My Submissions QuestionEditorial Solution Total Accepted: 15915 Total Submissions: 39596 Difficulty: Medium There are n bulbs that are initially off. You first turn on all the bulbs. Then, you turn off every second bulb. On the thi…

题目描述: There are n bulbs that are initially off. You first turn on all the bulbs. Then, you turn off every second bulb. On the third round, you toggle every third bulb (turning on if it's off or turning off if it's on). For the ith round, you toggle e…

There are n bulbs that are initially off. You first turn on all the bulbs. Then, you turn off every second bulb. On the third round, you toggle every third bulb (turning on if it's off or turning off if it's on). For the ith round, you toggle every i…

有n盏关着的灯,第k轮把序号为k倍数的关着的灯打开,开着的灯关闭. class Solution { public: int bulbSwitch(int n) { return (int)sqrt(n*1.0); } };…

智商压制的一道题 这个题有个数学定理: 一般数(非完全平方数)的因子有偶数个 完全平凡数的因子有奇数个 开开关的时候,第i个灯每到它的因子一轮的时候就会拨动一下,也就是每个灯拨动的次数是它的因子数 而拨动偶数次是关,拨动奇数次是开 现在就是求哪些数的因子有奇数个,也就是求n以内的完全平凡数 这里又有一个定理: n以内的完全平方数个数是sprt(n) 所以代码很简单 public int bulbSwitch(int n) { return (int)Math.sqrt(n); }…

[LeetCode]120. Triangle 解题报告(Python) 作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 题目地址https://leetcode.com/problems/triangle/description/ 题目描述: Given a triangle, find the minimum path sum from top to bottom. Each step you may move to adjac…

LeetCode 1 Two Sum 解题报告 偶然间听见leetcode这个平台,这里面题量也不是很多200多题,打算平时有空在研究生期间就刷完,跟跟多的练习算法的人进行交流思想,一定的ACM算法积累可以对以后在对算法中优化带来好处.Ok,今天是我做的第一题Add Two Sum. 题目要求 Given an array of integers, find two numbers such that they add up to a specific target number. The fu…

[题目] Given a collection of numbers that might contain duplicates, return all possible unique permutations. For example, [1,1,2] have the following unique permutations: [1,1,2], [1,2,1], and [2,1,1]. [解析] 题意:求一个数组的全排列.与[LeetCode]Permutations 解题报告 不同的是…

[LeetCode]Island Perimeter 解题报告 [LeetCode] https://leetcode.com/problems/island-perimeter/ Total Accepted: 16143 Total Submissions: 28552 Difficulty: Easy Question You are given a map in form of a two-dimensional integer grid where 1 represents land…