题意 将正整数N拆分成若干个正整数之和,问有多少种不重复的拆分方案. \(n \leq 5000\) 分析 用f(i,j)表示将i拆成若干个数字,最大的那个数字(即最后一个数)不超过j的方案数. 转移有两种情况,第一种是最大的数字不取j,第二种是取j \[f(i,j)=f(i,j-1)+f(i-j,j)\] 时间复杂度\(O(N^2)\) 然后就可以做了吗?稍微分析一下发现需要高精度,那么空间复杂度是\(O(W \cdot N^2)\)的,W=100. 显然不行. 考虑压位高精,每个整数存8位,…

题面戳这里 dp的姿势有两种(都保证了拆分的有序): \(f_{i,j}\)表示拆分中最大数为\(j\),和为\(i\)的方案数.转移\[f_{i,j} = \sum_{k = 1}^j f_{i-j,k}\] 然后可以用前缀和优化一下.复杂度\(O(N^2)\) \(f_{i,j}\)表示和为\(i\),拆分为\(j\)个数的方案数.转移这样考虑,要么在拆分方案中增加\(1\),要么把拆分中所有数增加\(1\).方程如下 \[f_{i,j} = f_{i-1,j-1}+f_{i-j,j}\]…

CodeForces 429B  Working out 预处理出从四个顶点到某个位置的最大权值,再枚举相遇点,相遇的时候只有两种情况,取最优解即可. #include<iostream> #include<vector> #include<cmath> #include<map> #include<algorithm> #include<cstring> #include<cstdio> #include<cstd…

安装Fedora 24在试用虚拟机时发现无法ping通外网. 我傻傻地以为是软件问题. 问题描述: 尝试ping程序来测试网络连通性: (我之前也是ping百度,后来在为了少打字百度了一些比较短的域名. 比如: "to." , "g.cn" , "j.mp" 等等.) (http://wenku.baidu.com/link?url=oSb0I5xzI1UBhU3aKTXoWll7PYaIm0zNiORJbx_h6PlT-bURWFOCXkW9W…

 省赛B题....手写链表..其实很简单的.... 比赛时太急了,各种手残....没搞出来....要不然就有金了...注:对相邻的元素需要特判..... Problem B Boxes in a Line You have n boxes in a line on the table numbered 1~n from left to right. Your task is to simulate 4 kinds of commands: 1 X Y: move box X to the lef…

C. Inna and Candy Boxes   Inna loves sweets very much. She has n closed present boxes lines up in a row in front of her. Each of these boxes contains either a candy (Dima's work) or nothing (Sereja's work). Let's assume that the boxes are numbered fr…

boxes [英][bɒksɪz][美][bɑ:ksɪz] n.盒( box的名词复数 ); 一盒; 电视; 小亭; v.把…装入盒[箱,匣]中( box的第三人称单数 ); 拳击;   以上结果来自金山词霸…

B. Candy Boxes Problem's Link:   http://codeforces.com/contest/488/problem/B Mean: T题目意思很简单,不解释. analyse: 这道题还是很有意思的,需要考虑到各种情况才能AC. 解这个题目之前,首先要推出两条式子 x4=3x1 4x1=x2+x3 然后就是分类讨论,枚举各种情况就可. Time complexity: O(1) Source code:  // Memory Time // 1347K 0MS…

题目来源:https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=3&page=show_problem&problem=39  Stacking Boxes  Background Some concepts in Mathematics and Computer Science are simple in one or two dimensions but become…

9.10 You have a stack of n boxes, with widths w., heights hir and depths drThe boxes cannot be rotated and can only be stacked on top of one another if each box in the stack is strictly larger than the box above it in width, height, and depth. Implem…

#include <bits/stdc++.h> using namespace std; ]; ][]; ][][]; ][][][]; ][][][][]; ][][][][][]; ][][][][][][]; struct node{ ]; int step; }; map<int,int> Hash; ],b[],c[]; bool check(int a[],int num,int step){ //检查有没有走过 ){ ]]>=) return true; ]]…

题目地址:http://acm.sgu.ru/problem.php?contest=0&problem=126 /* 找规律,智商不够,看了题解 详细解释:http://blog.csdn.net/ahfywff/article/details/7432524 */ #include <cstdio> #include <cmath> #include <cstring> #include <string> #include <iostrea…

http://poj.org/problem?id=1475 http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemId=249 Pushing Boxes Time Limit: 2000MS   Memory Limit: 131072K Total Submissions: 4662   Accepted: 1608   Special Judge Description Imagine you are standing insid…

Boxes Time Limit:3000MS     Memory Limit:0KB     64bit IO Format:%lld & %llu Submit Status Practice UVALive 6500 #include<stdio.h> #include<string.h> int main() { int T,m,n; int i,j,s; ][]; scanf("%d",&T); while(T--) { s=; sc…

Suppose you want to give an option to user to select only 5 check boxes from given any number of check boxes in an Oracle Form and if user selects more than 5 than give a message that you can not select more than 5. For this follow these steps:Create…

 Balls and Boxes(盒子与球) Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Description 题目描述 Mr. Chopsticks is interested in random phenomena, and he conducts an experiment to study randomness. In the experiment, he thr…

C. Balls and Boxes time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Little Vasya had n boxes with balls in the room. The boxes stood in a row and were numbered with numbers from 1 to n from…

原文链接:http://www.zhangxinxu.com/wordpress/2010/01/css-float%E6%B5%AE%E5%8A%A8%E7%9A%84%E6%B7%B1%E5%85%A5%E7%A0%94%E7%A9%B6%E3%80%81%E8%AF%A6%E8%A7%A3%E5%8F%8A%E6%8B%93%E5%B1%95%E4%B8%80/ <p>这是一行普通的文字,这里有个 <em>em</em> 标签.</p> 这段HTML代…

UVa 103 题目大意:给定n个箱子,每个箱子有m个维度, 一个箱子可以嵌套在另一个箱子中当且仅当该箱子的所有的维度大小全部小于另一个箱子的相应维度, (注意箱子可以旋转,即箱子维度可以互换),求最多能套几个箱子. 第一行输入为n,m,之后是n行m维的箱子 解题思路:嵌套关系是二元关系,因此这题即在DAG上做动态规划, 只不过将二维的判断改成了n维,其他不变. 详细看考:DAG上的动态规划之嵌套矩形  (ps:这题可以理解成嵌套m边形) /* UVa 103 Stacking Boxes --…

function script_faster_rcnn_demo() close all; clc; clear mex; clear is_valid_handle; % to clear init_key run(fullfile(fileparts(fileparts(mfilename('fullpath'))), 'startup')); %% -------------------- CONFIG -------------------- opts.caffe_version = '…

C. GukiZ hates Boxes Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/551/problem/C Description Professor GukiZ is concerned about making his way to school, because massive piles of boxes are blocking his way. In total there…

Balls and Boxes 题目链接: http://acm.hdu.edu.cn/showproblem.php?pid=5810 Description Mr. Chopsticks is interested in random phenomena, and he conducts an experiment to study randomness. In the experiment, he throws n balls into m boxes in such a manner t…

Boxes in a Line You have n boxes in a line on the table numbered 1 . . . n from left to right. Your task is to simulate 4 kinds of commands: ? 1 X Y : move box X to the left to Y (ignore this if X is already the left of Y ) ? 2 X Y : move box X to th…

Boxes Time Limit: 1 Sec Memory Limit: 256 MB 题目连接 http://hihocoder.com/contest/acmicpc2015beijingonline/problem/7 Description There is a strange storehouse in PKU. In this storehouse there are n slots for boxes, forming a line. In each slot you can p…

Create image server with nginx + lua (Openresty) + graphicsmagick (Part I) | Ian's PhotograPhy Blog Create image server with nginx + lua (Openresty) + graphicsmagick (Part I) A list of base boxes for Vagrant - Vagrantbox.es…

Problem C. GukiZ hates Boxes Solution: 假设最后一个非零的位置为K,所有位置上的和为S 那么答案的范围在[K+1,K+S]. 二分这个答案ans,然后对每个人尽量在ans时间内搬最多的砖.可以得出至少需要多少个人才能搬完.这个可以在O(n)的时间内利用贪心得到 只要判断需要的人数是否小于等于实际的人数就好了 时间复杂度O(nlogS) #include <bits/stdc++.h> using namespace std; ; int a[N]; int…

题目连接:103 - Stacking Boxes 题目大意:有n个w维立体, 输出立体互相嵌套的层数的最大值, 并输出嵌套方式, 可嵌套的要求是外层立体的w条边可以分别对应大于内层立体. 解题思路:可以将每个立体的w边安照从小到大排序, 比较的时候逐一比较就可以判断出可否嵌套, 然后就是纯DAG问题了. #include <stdio.h> #include <string.h> #include <algorithm> using namespace std; co…

12657 - Boxes in a Line You have n boxes in a line on the table numbered 1 . . . n from left to right. Your task is to simulate 4kinds of commands:• 1 X Y : move box X to the left to Y (ignore this if X is already the left of Y )• 2 X Y : move box X…

 Stacking Boxes  Background Some concepts in Mathematics and Computer Science are simple in one or two dimensions but become more complex when extended to arbitrary dimensions. Consider solving differential equations in several dimensions and analyzi…

N - Pushing Boxes Time Limit:2000MS     Memory Limit:131072KB     64bit IO Format:%I64d & %I64u Submit  Status Description Imagine you are standing inside a two-dimensional maze composed of square cells which may or may not be filled with rock. You c…