C. Dima and Salad 背包好题

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C. Dima and Salad 背包好题

http://codeforces.com/contest/366/problem/C 在n个物品中选出若干个,使得sum(a[i]) = k * sum(b[i]) 把问题转化一下就是,求sum(a[i] - k * b[i]) = 0的最大的a[i],这个时候已经把a[i]作为价值了那么怎么去求呢? 一开始因为a[i] - k * b[i]有负数,那么需要fix值,fix = 1000 我只设了dp[v]表示产生这个和值时的最大价值.那么如果能产生这个v值,就需要这个v值能整除fix.因为…

Codeforces Round #214 (Div. 2) C. Dima and Salad 背包

C. Dima and Salad Dima, Inna and Seryozha have gathered in a room. That's right, someone's got to go. To cheer Seryozha up and inspire him to have a walk, Inna decided to cook something. Dima and Seryozha have n fruits in the fridge. Each fruit has…

Codeforces Round #214 (Div. 2) C. Dima and Salad （背包变形）

C. Dima and Salad time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Dima, Inna and Seryozha have gathered in a room. That's right, someone's got to go. To cheer Seryozha up and inspire him to…

Dima and Salad(完全背包)

Dima and Salad time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Dima, Inna and Seryozha have gathered in a room. That's right, someone's got to go. To cheer Seryozha up and inspire him to ha…

CF#214 C. Dima and Salad 01背包变形

C. Dima and Salad 题意有n种水果,第i个水果有一个美味度ai和能量值bi,现在要选择部分水果做沙拉,假如此时选择了m个水果,要保证\(\frac{\sum_{i=1}^ma_i}{\sum_{i=1}^mb_i}==k\),问沙拉最大的美味度是多少? 思路 01背包变形. 对于给出的公式,我们化简一下: \(\sum_{i=1}^ma_i-k*\sum_{i=1}^mb_i==0\) 就变成了把a[i]-k*b[i]作为体积,a[i]作为价值,向容量为0的背包里放,可以取得的…

CF Dima and Salad 01背包

C. Dima and Salad time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Dima, Inna and Seryozha have gathered in a room. That's right, someone's got to go. To cheer Seryozha up and inspire him to…