不妨先操作一轮,使得$0\le a_{i}\le 2$ 结论:若序列中存在1,则答案为0或1 考虑归纳,注意到若序列中存在1,除非所有元素均为1,否则操作一轮后必然仍存在1,那么根据归纳假设即成立,而当所有元素均为1时,显然答案一定为0或1(序列长度已经为1),同样成立 由此,实际上只需要通过奇偶性即可确定答案,而注意到$|x-y|\equiv x+y(mod\ 2)$,因此不妨将转移的式子变为$a'_{i}=a_{i}+a_{i+1}$(模2意义下) 简单计数,不难发现$a_{i}$对答案的贡…

1043 - Triangle Partitioning PDF (English) Statistics Forum Time Limit: 0.5 second(s) Memory Limit: 32 MB See the picture below. You are given AB, AC and BC. DE is parallel to BC. You are also given the area ratio between ADE and BDEC. You have to fi…

1043 - Triangle Partitioning   PDF (English) Statistics Forum Time Limit: 0.5 second(s) Memory Limit: 32 MB See the picture below. You are given AB, AC and BC. DE is parallel to BC. You are also given the area ratio between ADE and BDEC. You have to…

12-3. 数据库连接日志 问题 你想为每次与数据库的连接和断开记录日志 解决方案 EF为DbContext的连接公开了一个StateChange 事件.我们需要处理这个事件, 为每次与数据库的连接和断开记录日志. 假设我们的模型如Figure 12-3所示. 在 Listing 12-3代码里, 我们创建一些Donation 实例,然后把它们保存到数据库. 这里的代码实现override SaveChanges() 方法为我们的StateChange 事件提供切入点. Figure 12-3.…

Given a triangle, find the minimum path sum from top to bottom. Each step you may move to adjacent numbers on the row below. For example, given the following triangle [ [], [,4], [6,,7], [4,,8,3] ] The minimum path sum from top to bottom is 11 (i.e.,…

Given an index k, return the kth row of the Pascal's triangle. For example, given k = 3,Return [1,3,3,1]. Note:Could you optimize your algorithm to use only O(k) extra space? 杨辉三角想必大家并不陌生,应该最早出现在初高中的数学中,其实就是二项式系数的一种写法. 1 1 1 1 2 1 1 3 3 1 1 4 6 4 1 1…

Given numRows, generate the first numRows of Pascal's triangle. For example, given numRows = 5,Return [ [1], [1,1], [1,2,1], [1,3,3,1], [1,4,6,4,1] ] 杨辉三角是二项式系数的一种写法,如果熟悉杨辉三角的五个性质,那么很好生成,可参见我的上一篇博文: http://www.cnblogs.com/grandyang/p/4031536.html 具体生…

题目简述: Given an index k, return the kth row of the Pascal's triangle. For example, given k = 3, Return [1,3,3,1]. Note: Could you optimize your algorithm to use only O(k) extra space? 解题思路: 这里的关键是空间的使用,既然只能用O(K)很容易就想到我们要进行回卷(名字好像不对).我的做法是每一次都在后面新加入一个数…

题目简述: Given numRows, generate the first numRows of Pascal's triangle. For example, given numRows = 5, Return [ [1], [1,1], [1,2,1], [1,3,3,1], [1,4,6,4,1]] 解题思路: 很简单的问题,只要把两头的一拿出来,中间就是两个数相加了. class Solution: # @return a list of lists of integers def…

http://poj.org/problem?id=1163 The Triangle Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 32923   Accepted: 19514 Description 73 88 1 02 7 4 44 5 2 6 5 (Figure 1) Figure 1 shows a number triangle. Write a program that calculates the hi…

Triangle - Delaunay Triangulator  eryar@163.com Abstract. Triangle is a 2D quality mesh generator and Delaunay triangulator. Triangle was created as part of the Quake project in the school of Computer Science at Carnegie Mellon University by Jonathan…

Problem: Given numRows, generate the first numRows of Pascal's triangle. For example, given numRows = 5,Return [ [1], [1,1], [1,2,1], [1,3,3,1], [1,4,6,4,1] ] Summary: 输出杨辉三角的前n行. Solution: 方法类似于LeetCode 119 Pascal's Triangle II class Solution { publ…

Problem: Given an index k, return the kth row of the Pascal's triangle. For example, given k = 3,Return [1,3,3,1]. Note:Could you optimize your algorithm to use only O(k) extra space? Summary: 返回杨辉三角(帕斯卡三角)的第k行. Solution: 1. 若以二维数组的形式表示杨辉三角,则可轻易推算出ro…

Given a triangle, find the minimum path sum from top to bottom. Each step you may move to adjacent numbers on the row below. For example, given the following triangle [      [2],     [3,4],    [6,5,7],   [4,1,8,3] ] The minimum path sum from top to b…

//此程序写出三个类,triangle,lader,circle:其中triangle类具有类型为double的a,b,c边以及周长,面积属性, //具有周长,面积以及修改三边的功能,还有判断能否构成三角形的boolean类. //lader类具有类型为double的上底下底和高,面积属性,具有返回面积的功能 //circlle 类具有类型为double的半径,周长和面积.具有返回周长面积的功能 //Lader类 class Lader { double shangDi; //上底 double…

方法一:SELECT CAST('123' AS SIGNED);方法二:SELECT CONVERT('123',SIGNED);方法三:SELECT '123'+0;…

我是把它分层来求的,也就是说第一层是1,第二层是12,第三层是123......你们该懂的!! #include <iostream>#include <cmath>using namespace std;int main (void){    int k,n,ss[10]={0,1,2,3,4,5,6,7,8,9}; //归根结底是在123456789里面取    double a,b,c,d,e,f;    cin>>k;    while(k--&&…

引擎中,ray与quad求交,算法未细看,但有求解二次方程,不解.ray与triangle求交,使用的是97年经典算法,仔细看过论文,多谢小武同学指点,用到了克拉默法则求解线性方程组.想模仿该方法,做ray与quad的求交,发现方程里不仅有u和v,还有uv,没法变换成线性方程组的形式.本以为引擎中quad中四个点可以不共面,看过接口,不然,“不共面和退化的多边形不保证正确结果“.而后又有两个问题,一是,与一个quad求交比与两个三角形求交快吗?二是,如果前面的问题答案为否,即两个三角形更快,为何…

Home GameWorks Blog Life of a triangle - NVIDIA's logical pipeline   Life of a triangle - NVIDIA's logical pipeline Facebook Twitter LinkedIn Google+ By Christoph Kubisch, posted Mar 16 2015 at 12:52PM Tags:  GameWorks GameWorks Expert Developer DX12…

Link:  http://codeforces.com/contest/407/problem/A 给定直角三角形的2个直角边a,b.求在直角坐标系中,是否存在对应的直角三角形,使得三个定点都在整点上,并且三边都不和坐标轴平行. 如果存在,输出YES,和三个点的坐标.否则输出NO 很显然,为了方便,可以把原点作为 一个顶点. 这道题目做的时候少考虑了很多情况. 比如: 如何使得边不和坐标轴平行?  要保证要求的另外两个点的横坐标或者纵坐标不能相等. 如何保证三角形是直角三角形? 只需要保证,另…

nginx一直报错, 2016/12/02 10:23:19 [error] 1472#0: *31 connect() failed (111: Connection refused)while connecting to upstream, client: 101.18.123.107, server: localhost 网上说是php相关的,但是我没有使用php. 我这边是因为远程服务器(client)要ping我的服务器,但是我的服务器禁用了ping,一直出错.允许ping即可.…

Given a triangle, find the minimum path sum from top to bottom. Each step you may move to adjacent numbers on the row below. For example, given the following triangle [ [], [,4], [6,,7], [4,,8,3] ] The minimum path sum from top to bottom is 11 (i.e.,…

123. Best Time to Buy and Sell Stock III 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 two transactions. Note:You may not engage in mul…

// uva 11401 Triangle Counting // // 题目大意: // // 求n范围内,任意选三个不同的数,能组成三角形的个数 // // 解题方法: // // 我们设三角巷的最长的长度是c(x),另外两边为y,z // 则由z + y > x得, x - y < z < x 当y = 1时,无解 // 当y = 2时,一个解,这样到y = x - 1 时 有 x - 2个 // 解,所以一共是0,1,2,3....x - 2,一共(x - 2) * (x - 1…

解题: 假如现在有一堆长度大于3小于9的电话号码,用座机呼叫,如果出现这样的号码[123和12345]那么12345将永远不会被拨出,因为拨到123的时候电话已经呼出了,试写一个函数输出所有不能被呼出的电话号码[指定传入参数类型如示例所示] 函数参数示例: public void function(int [] numbers){} package JingDian; public class Pnumber { public static void main(String[] args){ i…

Given a triangle, find the minimum path sum from top to bottom. Each step you may move to adjacent numbers on the row below. For example, given the following triangle [ [], [,4], [6,,7], [4,,8,3] ] The minimum path sum from top to bottom is 11 (i.e.,…

题目: Given a triangle, find the minimum path sum from top to bottom. Each step you may move to adjacent numbers on the row below. For example, given the following triangle [ [], [,4], [6,,7], [4,,8,3] ] The minimum path sum from top to bottom is 11 (i…

题目: Given an index k, return the kth row of the Pascal's triangle. For example, given k = 3, Return [1,3,3,1]. Note: Could you optimize your algorithm to use only O(k) extra space? 思路: 递归 package recursion; import java.util.List; import java.util.Arr…

Given a triangle, find the minimum path sum from top to bottom. Each step you may move to adjacent numbers on the row below. For example, given the following triangle [ [2], [3,4], [6,5,7], [4,1,8,3] ] The minimum path sum from top to bottom is 11 (i…

动态规划 int minimumTotal (vector<vector<int>>& triangle) { ; i >= ; --i) ; j < i + ; ++j) triangle[i][j] += min(triangle[i + ][j], triangle[i + ][j + ]); ][]; }…