题意:给出一个天平,给出c个钩子,及c个钩子的位置pos[i],给出g个砝码,g个砝码的质量w[i],问当挂上所有的砝码的时候,使得天平平衡的方案数, 用dp[i][j]表示挂了前i个砝码时,平衡点为j时的总的方案数, 状态转移为第i个砝码是否挂上,如果要挂上第i个砝码的话,j>=pos[i]*w[i](力矩=力臂*力) 因为最大的力矩为 20*15*25=150000 #include<iostream> #include<cstdio> #include<cstri…

 POJ 1837 -- Balance 转载:優YoU   http://user.qzone.qq.com/289065406/blog/1299341345 提示:动态规划,01背包 初看此题第一个冲动就是穷举....不过再细想肯定行不通= =O(20^20)等着超时吧... 我也是看了前辈的意见才联想到01背包,用动态规划来解 题目大意: 有一个天平,天平左右两边各有若干个钩子,总共有C个钩子,有G个钩码,求将钩码全部挂到钩子上使天平平衡的方法的总数. 其中可以把天枰看做一个以x轴0点作…

题目链接:http://poj.org/problem?id=1837 Balance Time Limit: 1000MS   Memory Limit: 30000K Total Submissions: 10983   Accepted: 6824 Description Gigel has a strange "balance" and he wants to poise it. Actually, the device is different from any other…

Balance Time Limit: 1000MS   Memory Limit: 30000K Total Submissions: 11878   Accepted: 7417 Description Gigel has a strange "balance" and he wants to poise it. Actually, the device is different from any other ordinary balance.  It orders two arm…

Q: dp 数组应该怎么设置? A: dp[i][j] 表示前 i 件物品放入天平后形成平衡度为 j 的方案数 题意: 有一个天平, 天平的两侧可以挂上重物, 给定 C 个钩子和G个秤砣. 2 4 -2 3 3 4 5 8 C = -2, G = 3, 那么 2*(3+4+5)=3*(8); 2*(4+8)=3*(3+5) 共有两种可行的方案, 那么结果就是2 Description Gigel has a strange "balance" and he wants to poise…

Description Gigel has a strange "balance" and he wants to poise it. Actually, the device is different from any other ordinary balance. It orders two arms of negligible weight and each arm's length is 15. Some hooks are attached to these arms and…

题目 http://poj.org/problem?id=1837 题意 单组数据,有一根杠杆,有R个钩子,其位置hi为整数且属于[-15,15],有C个重物,其质量wi为整数且属于[1,25],重物与重物之间,钩子与钩子之间彼此不同.忽略杠杆及重心的影响,有多少种方式使得全部重物都挂上钩子(某些钩子可能挂若干个重物)后杠杆平衡? 思路 由于状态比较小,即使n的五次方也足以承受,而且任意时刻杠杆的状态在[-15 * 25 * 20, 15 * 25 * 20]之间,所以可以直接穷举状态. 感想…

题目: http://poj.org/problem?id=1837 感觉dp的题目都很难做,这道题如果不看题解不知道憋到毕业能不能做出来,转化成了01背包问题,很神奇.. #include <stdio.h> #include <string.h> ][]; ], w[]; int main() { int n, m; scanf("%d %d", &n, &m); //天平上有n个砝码位置 ; i <= n; i++) { scanf(…

Balance Time Limit: 1000MS   Memory Limit: 30000K Total Submissions: 10326   Accepted: 6393 题意:给你n个挂钩g个砝码  以及n个挂钩的距离天平中心距离(负的代表左边正的代表右边)g个砝码的重量. 要求输出能够令天平平衡的方法种类 解题思路     http://user.qzone.qq.com/289065406/blog/1299341345  非常具体 #include<iostream> #i…

Balance Time Limit: 1000MS Memory Limit: 30000K Total Submissions: 9240 Accepted: 5670 Description Gigel has a strange "balance" and he wants to poise it. Actually, the device is different from any other ordinary balance. It orders two arms of n…