DP: 边界条件:dp[0][j] = 1 递推公式:dp[i][j] = sum{dp[i-k][j] * dp[k-1][j-1] | 0<k≤i} i对括号深度不超过j的,能够唯一表示为(X)Y形式,当中X和Y能够为空,设X有k-1对括号,则相应的方案数为dp[i-k][j] * dp[k-1][j-1] Little Brackets Time Limit: 2 Seconds      Memory Limit: 65536 KB Consider all regular bracke…

ZOJ Problem Set - 3822Domination(DP) problemCode=3822">题目链接 题目大意: 给你一个n * m的棋盘,每天都在棋盘上面放一颗棋子.直到这个棋盘上的每行每列都有至少有一颗棋子.求要用的天数的期望. 解题思路:         先求出不同摆法的棋盘的概率,然后在和天数相乘就是期望.         我们将棋盘划分为四个部分:当中一部分为每行没列都至少有一个棋子.         然后得出状态转移方程:         dp[x][y][k…

题意:切一个凸边行,如果不是凸包直接输出.然后输出最小代价的切割费用,把凸包都切割成三角形. 先判断是否是凸包,然后用三角形优化. dp[i][j]=min(dp[i][j],dp[i][k]+dp[k][j]+w[i][k]+w[j][k]); w[i][j]代表i到j点的切割费用. dp[i][j]:表示以i到j点的最小费用.则可把凸边行分成三个部分的费用.两个凸边行(i,k),(k,j)和两条边的费用(i,k),(j,k),k为枚举的三角形顶点. Zoj 3537 Cake (DP_最优三…

B - Battle Ships Time Limit:2000MS     Memory Limit:65536KB     64bit IO Format:%lld & %llu Submit Status Practice ZOJ 3623 Appoint description:   Description Battle Ships is a new game which is similar to Star Craft. In this game, the enemy builds a…

Breaking Strings Time Limit: 2 Seconds        Memory Limit: 65536 KB A certain string-processing language allows the programmer to break a string into two pieces. Since this involves copying the old string, it costs n units of time to break a string…

Famil Door and Brackets Time Limit: 20 Sec  Memory Limit: 512 MB Description Input Output Sample Input 4 1 ( Sample Output 4 HINT Solution 显然,我们考虑运用DP.先求出 f[i][j] 表示 长度为 i 的括号序列,“)” 比 “(” 多 j 个的方案(时刻保证 j >= 0). 然后我们考虑怎样获得答案.先预处理出L,R表示将读入的括号序列消去若干对之后剩…

C. Famil Door and Brackets 题目连接: http://www.codeforces.com/contest/629/problem/C Description As Famil Door's birthday is coming, some of his friends (like Gabi) decided to buy a present for him. His friends are going to buy a string consisted of roun…

ZOJ - 3777 就是一个入门状压dp期望 dp[i][j] 当前状态为i,分数为j时的情况数然后看代码 有注释 #include <iostream> #include <cstdio> #include <sstream> #include <cstring> #include <map> #include <cctype> #include <set> #include <vector> #inclu…

E. Arthur and Brackets time limit per test 2 seconds memory limit per test 128 megabytes input standard input output standard output Notice that the memory limit is non-standard. Recently Arthur and Sasha have studied correct bracket sequences. Arthu…

转自:http://blog.csdn.net/a497406594/article/details/38442893 Kill the Monsters Time Limit: 7 Seconds Memory Limit: 32768 KB In order to celebrate the 8th anniversary of ZOJ, watashi introduces a strange game to other ZJU ACM team members. The board of…