Big Event in HDU  HDU1171 就是求一个简单的背包: 题意:就是给出一系列数,求把他们尽可能分成均匀的两堆 如:2 10 1 20 1     结果是:20 10.才最均匀! 三种解法: 多重背包的优化与否:(1031MS) #include<iostream> #include<stdio.h> #include<algorithm> #include<string.h> using namespace std; ]; ],b[];…

首先,什么叫多重背包呢? 大概意思就是:一个背包有V总容量,有N种物品,其价值分别为Val1,Val2--,Val3,体积对应的是Vol1,Vol2,--,Vol3,件数对应Num1,Num2--,Num3 求背包至多装满的最大总价值. 其实,首先可以当作01背包来做,这时候复杂度就是O(V*sum(Num[i])); 简单代码来说就是 for(int i=1;i<=N;i++) for(int j=1;j<=Num[i];j++) for(int k=V;k>=Vol[i];k++)…

//hdu1171void solve(){ for(int i=1;i<=n;i++) { for(int j=W;j>=w[i];j--) { dp[j]=max(dp[j],dp[j-w[i]]+val[i]); } }}void solve1(){ for(int i=1;i<=n;i++) { for(int j=INF;j>=val[i];j--) { dp[j]=max(dp[j],dp[j-val[i]]+val[i]); } }}int main(){ ios::…

hdu1171 题意:有 $n$ 种设施,每种有价值 $v_i$ 和数量 $m_i$,求一种方案使得分成价值尽可能相近的两组.($n \leq 50, v_i \leq 50, m_i \leq 100$) 分析: 可以用背包做,这里讲母函数的做法. 直接用样例说明一下: 310 1 20 230 1 其母函数为 $$(1+x^{10})(1+x^{20}+x^{40})(1+x^{30})$$ 多项式展开后,倒着枚举 $i$ 从 $sum/2$ 到0,如果 $x^i$ 前的系数不为0说明能够组…

转载:http://www.jianshu.com/p/6167b9ce7af8 序 有朋友在做类似iTool的功能,跟我聊起来,这几天闲,就写了一个demo,不是正经做这个,还很粗略,具体干货诸位等这位朋友自己发文吧. DEMO https://github.com/liulishuo/testAppList 思路 iOS9白名单的上限是50个,如果想绕过这个限制,扫描系统中所有app的状态,只有使用私有API,需要用到的类有两个:LSApplicationWorkspace.LSApplic…

Big Event in HDU Problem Description Nowadays, we all know that Computer College is the biggest department in HDU. But, maybe you don't know that Computer College had ever been split into Computer College and Software College in 2002.The splitting is…

Big Event in HDU Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 18273    Accepted Submission(s): 6403 Problem DescriptionNowadays, we all know that Computer College is the biggest department i…

use fmax().-------TLE #define mmax(a,b) (a)>(b)?(a):(b);   ---796ms that's it! #include <stdio.h> #include <string.h> #include <math.h> #define mmax(a,b) (a)>(b)?(a):(b); int main(){ **+]; int n,t,i,j,res; +]; int t1,t2; int cnt,su…

Big Event in HDU DescriptionNowadays, we all know that Computer College is the biggest department in HDU. But, maybe you don't know that Computer College had ever been split into Computer College and Software College in 2002.The splitting is absolute…

转载请注明出处:http://blog.csdn.net/u012860063 题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1171 Problem Description Nowadays, we all know that Computer College is the biggest department in HDU. But, maybe you don't know that Computer College had ever bee…