题目描述：
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 ...
作者归档：在线疯狂
[LeetCode]The Skyline Problem
线段树 | 第1讲 （给定区间求和）
作者是
发布于
在
数据结构,
算法,
译林.
让我们通过考虑下面的问题来理解线段树。
给定一个数组arr[0 . . . n-1]，我们要对数组执行这样的操作：
1 计算从下标l到r的元素之和，其中 0 <= l <= r <= n-1
2 修改数组指定元素的值arr[i] = x，其中 0 <= i <= n-1
一个简单的方案是从l到r执行循环，计算给定区间的元素之和。更新值的时候，简单地令arr[i] = x。第一个操作花费O(n)的时间，第二个操作花费O ...
[LeetCode]ZigZag Conversion
作者是
发布于
在
LeetCode.
题目描述：
The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fixed font for better legibility)
P A H N A P L S ...
[LeetCode]Clone Graph
作者是
发布于
在
LeetCode.
题目描述：
Clone an undirected graph. Each node in the graph contains a label and a list of its neighbors.
OJ's undirected graph serialization:
Nodes are labeled uniquely.
We use # as a separator for each node, and , as a separator for ...
[LeetCode]Gas Station
作者是
发布于
在
LeetCode.
题目描述：
There are N gas stations along a circular route, where the amount of gas at station i is gas[i].
You have a car with an unlimited gas tank and it costs cost[i] of gas to travel from ...