218. 天际线问题 城市的天际线是从远处观看该城市中所有建筑物形成的轮廓的外部轮廓.现在,假设您获得了城市风光照片(图A)上显示的所有建筑物的位置和高度,请编写一个程序以输出由这些建筑物形成的天际线(图B). Buildings Skyline Contour 每个建筑物的几何信息用三元组 [Li,Ri,Hi] 表示,其中 Li 和 Ri 分别是第 i 座建筑物左右边缘的 x 坐标,Hi 是其高度.可以保证 0 ≤ Li, Ri ≤ INT_MAX, 0 < Hi ≤ INT_MAX 和 Ri…

A city's skyline is the outer contour of the silhouette formed by all the buildings in that city when viewed from a distance. Now suppose you are given the locations and height of all the buildings as shown on a cityscape photo (Figure A), write a pr…

天际线问题 城市的天际线是从远处观看该城市中所有建筑物形成的轮廓的外部轮廓.现在,假设您获得了城市风光照片(图A)上显示的所有建筑物的位置和高度,请编写一个程序以输出由这些建筑物形成的天际线(图B). 每个建筑物的几何信息用三元组 [Li,Ri,Hi] 表示,其中 Li 和 Ri 分别是第 i 座建筑物左右边缘的 x 坐标,Hi 是其高度.可以保证 0 ≤ Li, Ri ≤ INT_MAX, 0 < Hi ≤ INT_MAX 和 Ri - Li > 0.您可以假设所有建筑物都是在绝对平坦且高度…

Find all possible combinations of k numbers that add up to a number n, given that only numbers from 1 to 9 can be used and each combination should be a unique set of numbers. Ensure that numbers within the set are sorted in ascending order. Example 1…

Given a string S, you are allowed to convert it to a palindrome by adding characters in front of it. Find and return the shortest palindrome you can find by performing this transformation. For example: Given "aacecaaa", return "aaacecaaa&qu…

Given a 2D board and a list of words from the dictionary, find all words in the board. Each word must be constructed from letters of sequentially adjacent cell, where "adjacent" cells are those horizontally or vertically neighboring. The same le…

Design a data structure that supports the following two operations: void addWord(word)bool search(word) search(word) can search a literal word or a regular expression string containing only letters a-z or .. A . means it can represent any one letter.…

There are a total of n courses you have to take, labeled from 0 to n - 1. Some courses may have prerequisites, for example to take course 0 you have to first take course 1, which is expressed as a pair: [0,1] Given the total number of courses and a l…

Given a 2d grid map of '1's (land) and '0's (water), count the number of islands. An island is surrounded by water and is formed by connecting adjacent lands horizontally or vertically. You may assume all four edges of the grid are all surrounded by…

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 at most k transactions. 解题思路: https://leetcode.com/discuss/18330/is-it-best-solution-with-o-n-o-1…