Problem Description Given a matrix with n rows and m columns ( n+m ,) and you want to go to the number at bottom-right corner (n,m). And you must go right or go down every steps. Let the numbers you go through become an array a1,a2,...,a2k. The cost…

简单DP /* *********************************************** Author :Zhou Zhentao Email :774388357@qq.com Created Time :2015/11/21 9:45:58 File Name :acm.cpp ************************************************ */ #include<cstdio> #include<cstring> #in…

matrix Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=5569 Description Given a matrix with n rows and m columns ( n+m is an odd number ), at first , you begin with the number at top-left corner (1,1) and you wa…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=2686 思路:多线程dp,参考51Nod 1084:http://www.51nod.com/onlineJudge/questionCode.html#!problemId=1084 注:这道题用滚动数组优化反而WA,压到三维即可 代码: #include <bits/stdc++.h> using namespace std; ][],dp[][][]; int main() { int n;…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=4576 题意:给出1~n的环,m个操作,每次能顺时针或逆时针走w步,询问最后在l~r这段区间内概率.(1<=n<=200) ,(0<=m<=1,000,000),(1<=l<=r<=n).分析:每次从某一个数字到达另外数字的概率为0.5,按概率dp求出到达每个数字的概率,然后枚举从l到r的概率相加即可.dp[i][j]表示第i次操作落在数字j上的概率,但是不能直接开10…

题意:给你一个序列,问相邻两数高度差绝对值小于等于H的子序列有多少个. dp[i]表示以i为结尾的子序列有多少,易知状态转移方程为:dp[i] = sum( dp[j] ) + 1;( abs( height[i] - height[j] ) <= H ) 由abs( height[i] - height[j] ) <= H 可得 height[i] - H <= height[j] <= height[i] + H 将序列中的数离散化,每个height对应一个id, 用树状数组求…

题意: 给定n个点的树,m个黑点 以下n-1行给出边和删除这条边的费用 以下m个黑点的点标[0,n-1] 删除一些边使得随意2个黑点都不连通. 问删除的最小花费. 思路: 树形dp 每一个点有2个状态,成为黑点或白点. 若本身这个点就是黑点那么仅仅有黑点一种状态. 否则能够觉得是子树中某个黑点转移上来. 所以dp[i][0]是i点为黑点的状态. #pragma comment(linker, "/STACK:1024000000,1024000000") #include <st…

Frog Time Limit: 3000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Total Submission(s): 712    Accepted Submission(s): 338 Problem Description A little frog named Fog is on his way home. The path's length is N (1 <= N <= 100),…

http://acm.hdu.edu.cn/showproblem.php?pid=5569 matrix Time Limit: 6000/3000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 325    Accepted Submission(s): 196 Problem Description Given a matrix with n rows and m colu…

Super Jumping! Jumping! Jumping! Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 33384    Accepted Submission(s): 15093 Problem Description Nowadays, a kind of chess game called “Super Jumping!…