传送门 反正我是看不出来这题和凸包有什么关系--大佬们是怎么想到的-- 不准确一点的说,本题就是要我们求一个边上点数最多的凸包 我们可以先把所有的边都取出来,然后按极角排序.枚举这个凸包的起点,然后做dp即可 复杂度\(O(n^3)\) //minamoto #include<bits/stdc++.h> #define rint register int using namespace std; const int N=305; struct node{int u,v;double x,y;…

http://www.lydsy.com/JudgeOnline/problem.php?id=1591 https://www.luogu.org/problemnew/show/P2924#sub 有n(5≤n≤250)个栅栏点,FJ需要围成一个栅栏圈,这个圈是一个凸包并且凸包上的点最多. 这题题解写的如此之玄幻,题目看起来如此之不可做…… 然而实际很简单……看了半天题解发现不如看他代码. 我们考虑我们是怎么构造凸包的,就是通过点的极角排序来判断这个点所引出的线应该往哪里转(或者可能不取这个…

Search GO 说明:输入题号直接进入相应题目,如需搜索含数字的题目,请在关键词前加单引号 Problem ID Title Source AC Submit Y 1000 A+B Problem 10983 18765 Y 1036 [ZJOI2008]树的统计Count 5293 13132 Y 1588 [HNOI2002]营业额统计 5056 13607 1001 [BeiJing2006]狼抓兔子 4526 18386 Y 2002 [Hnoi2010]Bounce 弹飞绵羊 43…

Given a list of non negative integers, arrange them such that they form the largest number. For example, given [3, 30, 34, 5, 9], the largest formed number is 9534330. Note: The result may be very large, so you need to return a string instead of an i…

Given an array which consists of non-negative integers and an integer m, you can split the array into m non-empty continuous subarrays. Write an algorithm to minimize the largest sum among these m subarrays. Note:Given m satisfies the following const…

Given a set of distinct positive integers, find the largest subset such that every pair (Si, Sj) of elements in this subset satisfies: Si % Sj = 0 or Sj % Si = 0. If there are multiple solutions, return any subset is fine. Example 1: nums: [1,2,3] Re…

Given a binary tree, find the largest subtree which is a Binary Search Tree (BST), where largest means subtree with largest number of nodes in it. Note:A subtree must include all of its descendants.Here's an example: 10 / \ 15 / \ \ 1 8 7 The Largest…

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…

Find the kth largest element in an unsorted array. Note that it is the kth largest element in the sorted order, not the kth distinct element. For example, Given [3,2,1,5,6,4] and k = 2, return 5. Note: You may assume k is always valid, 1 ≤ k ≤ array'…

Given a list of non negative integers, arrange them such that they form the largest number. For example, given [3, 30, 34, 5, 9], the largest formed number is 9534330. Note: The result may be very large, so you need to return a string instead of an i…