729. 我的日程安排表 I 实现一个 MyCalendar 类来存放你的日程安排.如果要添加的时间内没有其他安排,则可以存储这个新的日程安排. MyCalendar 有一个 book(int start, int end)方法.它意味着在 start 到 end 时间内增加一个日程安排,注意,这里的时间是半开区间,即 [start, end), 实数 x 的范围为, start <= x < end. 当两个日程安排有一些时间上的交叉时(例如两个日程安排都在同一时间内),就会产生重复预订.

会议安排 Time Limit:1000MS Memory Limit:65536KB Total Submit:451 Accepted:102 Description 科研人员与相关领域的国内外同行进行适时的接触与充分的交流,对于促进提高他们的科研业务水平,并及时掌握科研动态是十分必要而且重要的.ECNU为了走在科技的前沿,于是决定派遣一些学者出去参加会议.由于这些会议具有不同的级别,因此对于科研人员可能带来的科研上的促进作用也就可能不同.但是一个学者不能同时参加两个会议.而且,如果一个学者

小二终于开通博客了,真是高兴.最近在看Java,所以就拿leetcode练练手了.以后我会将自己解体过程中的思路写下来,分享给大家,其中有我自己原创的部分,也有参考别人的代码加入自己理解的部分,希望大家看了多提意见,一块加油. 问题描述: Given an array of integers, find two numbers such that they add up to a specific target number. The function twoSum should return

在学习python的过程中,做练习,解析https://www.python.org/events/python-events/ HTML文件,输出Python官网发布的会议时间.名称和地点. 对html的解析是网页抓取的基础,分析抓取的结果找到自己想要的内容或标签以达到抓取的目的. HTMLParser是python用来解析html的模块.它可以分析出html里面的标签.数据等等,是一种处理html的简便途径. HTMLParser采用的是一种事件驱动的模式,当HTMLParser找到一个特定

题目描述: Given an array of numbers nums, in which exactly two elements appear only once and all the other elements appear exactly twice. Find the two elements that appear only once. For example: Given nums = [1, 2, 1, 3, 2, 5], return [3, 5]. Note: The

题目描述: Write a function that takes an unsigned integer and returns the number of ’1' bits it has (also known as the Hamming weight). For example, the 32-bit integer ’11' has binary representation 00000000000000000000000000001011, so the function shoul

问题描述: Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique triplets in the array which gives the sum of zero. Note: Elements in a triplet (a,b,c) must be in non-descending order. (ie, a ≤ b ≤ c) The

题目描述: Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. The brackets must close in the correct order, "()" and "()[]{}" are all valid but "(]" and "([)

题目描述: Given a string, find the first non-repeating character in it and return it's index. If it doesn't exist, return -1. Examples: s = "leetcode" return 0. s = "loveleetcode", return 2. 解题思路: 开个26个数的数组,然后先对字符串过一遍,统计每个字母出现的次数,然后从头再国一遍,

题目描述: Given n, how many structurally unique BST's (binary search trees) that store values 1...n? For example,Given n = 3, there are a total of 5 unique BST's. 1 3 3 2 1 \ / / / \ \ 3 2 1 1 3 2 / / \ \ 2 1 2 3 解题思路: 动态规划法. 用G(n)表示长度为n组成的二叉搜索树的数目: G(0)

题目描述: Given an array of integers, every element appears three times except for one. Find that single one. 解题思路: 具体参考Detailed explanation and generalization of the bitwise operation method for single numbers 讲的实在是很全面,而且拓展到了一般的情况,膜!! 代码如下: public class

题目描述: The thief has found himself a new place for his thievery again. There is only one entrance to this area, called the "root." Besides the root, each house has one and only one parent house. After a tour, the smart thief realized that "a

题目描述: Given a string array words, find the maximum value of length(word[i]) * length(word[j]) where the two words do not share common letters. You may assume that each word will contain only lower case letters. If no such two words exist, return 0. E

题目描述: Given a binary tree, return the inorder traversal of its nodes' values. For example:Given binary tree {1,#,2,3}, 1 \ 2 / 3 return [1,3,2]. 解题思路: 使用栈.从根节点开始迭代循环访问,将节点入栈,并循环将左子树入栈.如果当前节点为空,则弹出栈顶节点,也就是当前节点的父节点,并将父节点的值加入到list中,然后选择右节点作为循环的节点,依次循环.

题目描述: Given a non negative integer number num. For every numbers i in the range 0 ≤ i ≤ num calculate the number of 1's in their binary representation and return them as an array. Example:For num = 5 you should return [0,1,1,2,1,2]. Follow up: It is

题目描述: Given a binary tree, return the preorder traversal of its nodes' values. For example:Given binary tree {1,#,2,3}, 1 \ 2 / 3 return [1,2,3]. 解题思路: 这个问题最简单的方法是使用递归,但是题目规定不能使用,得使用迭代的方法. 那么我们考虑使用栈来实现. 思路是每次遍历这节点,把该点的值放入list中,然后把该点的右孩子放入栈中,并将当前点设置为左

题目描述: Given an array containing n distinct numbers taken from 0, 1, 2, ..., n, find the one that is missing from the array. For example,Given nums = [0, 1, 3] return 2. Note:Your algorithm should run in linear runtime complexity. Could you implement

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

题目描述: Say you have an array for which the ith element is the price of a given stock on day i. Design an algorithm to find the maximum profit. You may complete as many transactions as you like (ie, buy one and sell one share of the stock multiple time

题目描述: Given an array of n integers where n > 1, nums, return an array output such that output[i] is equal to the product of all the elements of nums except nums[i]. Solve it without division and in O(n). For example, given [1,2,3,4], return [24,12,8,

题目描述: Given an array of integers, every element appears twice except for one. Find that single one. 解题思路: 参考别人的想法,用异或的方法实在是太绝了.A ^ A = 0 and A ^ B ^ A = B,因为只有一个是单着的,那么其他成对的两数相异或的结果是0,最后与单着的数异或还是为这个数. 代码如下: public class Solution { public int singleNu