题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=5543 题意:给你一根长为m的长木板和一些小木棒,每一根小木棒有它的长度和价值,这些小木棒要放在长木板上并且每一根小木棒的重心要在长木板上(即可以露出一半的长),问最大价值是多少. dp[i][j][k]  表示前i个小棒放到长度为j的木板上,其中有k个小棒放在边沿部分, 边沿部分的小棒需要尽量放在木板外面(贪心思维),所以放在边沿的木棒落在木板上的长度为l/2.然后就是简单的01背包问题了. tip…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=5543 题意: 给你N个金条和一张长度为L的桌子.每个金条长度为a[i],价值为w[i].金条只能在桌子上横着摆一排,并且只要金条的重心(中心)在桌子上,就可以放.问你在桌子上能够摆的金条的最大总价值. 题解: 首先表示状态: 考虑到第i个金条,在这之前已经占用了j的长度,在k个端点摆了金条.即:dp[i][j][k] 如何转移(逆推): 对于第i个金条,有三种决策:摆在桌子中央.摆在桌子端点处.不摆…

背包变形.与普通的背包问题不同的是:允许有两个物品可以花费减半. 因此加一维即可,dp[i][j][k]表示前i个物品,有j个花费减半了,总花费为k的情况下的最优解. #pragma comment(linker, "/STACK:1024000000,1024000000") #include<cstdio> #include<cstring> #include<cmath> #include<algorithm> #include&l…

Pick The Sticks Time Limit: 15000/10000 MS (Java/Others)    Memory Limit: 65535/65535 K (Java/Others)Total Submission(s): 593    Accepted Submission(s): 193 Problem Description The story happened long long ago. One day, Cao Cao made a special order c…

D - Pick The Sticks Time Limit: 1 Sec Memory Limit: 256 MB 题目连接 无 Description The story happened long long ago. One day, Cao Cao made a special order called "Chicken Rib" to his army. No one got his point and all became very panic. However, Cao…

HDU 1176 免费馅饼 (动态规划) Description 都说天上不会掉馅饼,但有一天gameboy正走在回家的小径上,忽然天上掉下大把大把的馅饼.说来gameboy的人品实在是太好了,这馅饼别处都不掉,就掉落在他身旁的10米范围内.馅饼如果掉在了地上当然就不能吃了,所以gameboy马上卸下身上的背包去接.但由于小径两侧都不能站人,所以他只能在小径上接.由于gameboy平时老呆在房间里玩游戏,虽然在游戏中是个身手敏捷的高手,但在现实中运动神经特别迟钝,每秒种只有在移动不超过一米的范围…

HDU 1074 Doing Homework (动态规划,位运算) Description Ignatius has just come back school from the 30th ACM/ICPC. Now he has a lot of homework to do. Every teacher gives him a deadline of handing in the homework. If Ignatius hands in the homework after the d…

Pick The Sticks Time Limit: 15000/10000MS (Java/Others)     Memory Limit: 65535/65535KB (Java/Others) The story happened long long ago. One day, Cao Cao made a special order called "Chicken Rib" to his army. No one got his point and all became v…

D - Pick The Sticks Description The story happened long long ago. One day, Cao Cao made a special order called "Chicken Rib" to his army. No one got his point and all became very panic. However, Cao Cao himself felt very proud of his interesting…

题目链接:http://acm.uestc.edu.cn/#/problem/show/1218 题目大意就是求n根木棒能不能放进一个容器里,乍一看像01背包,但是容器的两端可以溢出容器,只要两端的木棒的重心还在容器中即可. 首先由于木棒可以两端溢出.一端溢出和不溢出三种情况,所以有状态p(flag, v)表示溢出个数为flag的容量为v的情况下的最值. 于是有: p[2][j] = max(p[2][j], p[2][j-a[i]]+v[i]); p[2][j] = max(p[2][j], …