Jam's balance Problem Description Jim has a balance and N weights. (1≤N≤20)The balance can only tell whether things on different side are the same weight.Weights can be put on left side or right side arbitrarily.Please tell whether the balance can me…

来自官方题解: AC代码: #pragma comment(linker, "/STACK:1024000000,1024000000") #include<iostream> #include<cstdio> #include<cstring> #include<cmath> #include<math.h> #include<algorithm> #include<queue> #include&l…

HDU 5616 Jam's balance(Jam的天平) Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)   Problem Description - 题目描述 Jim has a balance and N weights. (1≤N≤20) The balance can only tell whether things on different side are t…

题目网址:http://acm.hdu.edu.cn/showproblem.php?pid=5616 题目: Jam's balance Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 1810    Accepted Submission(s): 754 Problem Description   Jim has a balance…

题目网址:http://acm.hdu.edu.cn/showproblem.php?pid=5616 题目: Jam's balance Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 1810    Accepted Submission(s): 754 Problem Description   Jim has a balance…

http://acm.hdu.edu.cn/showproblem.php?pid=5616 思路 题目中蕴含着两种需要计算的重量 1. 从所有的砝码中挑出任意种2.(转换的思想)在天平的两端都挑出这些砝码中的一些,它也可以计算出差值,这个差值也是一种重量    这其实一种转换,看下面这个公式(左端砝码的重量)==(右端砝码的重量+能计算出的重量G)    当第一次选择一个砝码,我们计算出了以第二种方式的一种重量G,那么它也要被记为true,它还可以    继续更新出新的重量,G(新的左端砝码重…

背包.dp[i]=1表示i这种差值能被组合出来,差值有负数,所以用sum表示0,0表示-sum,2*sum表示sum. 询问X的时候,只需看dp[sum+X]或者dp[sum-X]是否有一个为1,注意RE. #include<cstdio> #include<cstring> #include<cmath> #include<vector> #include<algorithm> #include<queue> using names…

The Highest Mark Time Limit: 1 Sec Memory Limit: 256 MB 题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=5501 Description 2045年的SD省队选拔,赛制和三十年前已是完全不同.一场比赛的比赛时间有 ttt 分钟,有 nnn 道题目. 第 iii 道题目的初始分值为 Ai(Ai≤106)A_i(A_i \leq 10^{6})A​i​​(A​i​​≤10​6​​) 分,之后每过一分…

http://acm.hdu.edu.cn/showproblem.php?pid=1011   题意:每个节点有两个值bug和brain,当清扫该节点的所有bug时就得到brain值,只有当父节点被清空时,才可以清扫它          的子节点,而清扫需要一定的人员.给定M个人员,N个结点的树,求最大brain和   这看起来是一道非常简单的背包dp 但是 写完提交wa之后,我发现这道题,并不简单!因为他的题意并不是完全和我找到的题意一样(我承认我语文很差劲所以随便找个题解看题意..),题目…

题目链接:HDU 5119 Problem Description Matt has N friends. They are playing a game together. Each of Matt's friends has a magic number. In the game, Matt selects some (could be zero) of his friends. If the xor (exclusive-or) sum of the selected friends'ma…