There are some trees, where each tree is represented by (x,y) coordinate in a two-dimensional garden. Your job is to fence the entire garden using the minimum length of rope as it is expensive. The garden is well fenced only if all the trees are encl…

leetcode.587.Erect the Fence 凸包问题.好像是我在leetcode做的第一个凸包问题吧. 第一次做,涉及到的东西还是蛮多的.有一个东西很重要,就是已知一个点和一个矢量,求这个点在这个矢量的左边还是右边.网上都是用一个点对于已知直线的位置的描述,用矢量代替直线更准确,直观. http://blog.csdn.net/modiz/article/details/9928955一个是用面积法描述的 http://blog.csdn.net/modiz/article/det…

There are some trees, where each tree is represented by (x,y) coordinate in a two-dimensional garden. Your job is to fence the entire garden using the minimum length of rope as it is expensive. The garden is well fenced only if all the trees are encl…

Problem statement: There are some trees, where each tree is represented by (x,y) coordinate in a two-dimensional garden. Your job is to fence the entire garden using the minimum length of rope as it is expensive. The garden is well fenced only if all…

C. Painting Fence time limit per test 1 second memory limit per test 512 megabytes input standard input output standard output Bizon the Champion isn't just attentive, he also is very hardworking. Bizon the Champion decided to paint his old fence his…

Problem: There is a fence with n posts, each post can be painted with one of the k colors. You have to paint all the posts such that no more than two adjacent fence posts have the same color. Return the total number of ways you can paint the fence. N…

There are some trees, where each tree is represented by (x,y) coordinate in a two-dimensional garden. Your job is to fence the entire garden using the minimum length of rope as it is expensive. The garden is well fenced only if all the trees are encl…

There is a fence with n posts, each post can be painted with one of the k colors. You have to paint all the posts such that no more than two adjacent fence posts have the same color. Return the total number of ways you can paint the fence. Note:n and…

问题 给定一群树的坐标点,画个围栏把所有树围起来(凸包). 至少有一棵树,输入和输出没有顺序. Input: [[1,1],[2,2],[2,0],[2,4],[3,3],[4,2]] Output: [[1,1],[2,0],[4,2],[3,3],[2,4]] 思路和代码 1. 暴力法(超时) 对于任意两点连成的一条直线,如果其它所有点都在这条直线的一侧,则这两个点为解集中的两个点. 怎么判断点在直线的同一侧呢? 假设确定直线的两点为p1(x1, y1)和p2(x2, y2),方向从p1到p…

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