Dropping tests Time Limit: 1000MS Memory Limit: 65536K Description In a certain course, you take n tests. If you get ai out of bi questions correct on test i, your cumulative average is defined to be Given your test scores and a positive integer k, d
Language: Default Desert King Time Limit: 3000MS Memory Limit: 65536K Total Submissions: 22113 Accepted: 6187 Description David the Great has just become the king of a desert country. To win the respect of his people, he decided to build channels
Sightseeing Cows Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 9703 Accepted: 3299 Description Farmer John has decided to reward his cows for their hard work by taking them on a tour of the big city! The cows must decide how best to
71 奶牛施工队一场地震把约翰家园摧毁了,坚强的约翰决心重建家园.约翰已经修复了 N 个牧场,他需要再修复一些道路把它们连接起来.碰巧的是,奶牛们最近也成立了一个工程队,专门从事道路修复.而然,奶牛们很有经济头脑,如果无利可图,它们是不会干的.约翰和奶牛达成了协议,约翰向奶牛支付 F 元,奶牛负责修路,但不必修复所有道路,只要确保所有牧场连通即可.可供奶牛选择修复的道路有 M 条,第 i 条道路连接第 Ui 个牧场和第 Vi 个牧场,修复需要 Ti 分钟,支出成本为 Ci.保证连通所有牧场的道
Dropping tests Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 8176 Accepted: 2862 Description In a certain course, you take n tests. If you get ai out of bi questions correct on test i, your cumulative average is defined to be . Given
Dropping tests Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 6373 Accepted: 2198 [Description] In a certain course, you take n tests. If you get ai out of bi questions correct on test i, your cumulative average is defined to be . G
poj2976 题意 给出 a b 数组,一共 n 对数,其中最多可以去掉 k 对,问怎样使剩下比率(原始比率是 $ \frac{\sum_{i=1}^{n} a}{\sum_{i=1}^{n} b}*100 $)最大. 分析 01分数规划 设 \(l=\frac{\sum a}{\sum b}\),我们要求使得 l 最大,构造新函数 \(F()={\sum a}-l*{\sum b}\),设\(D()=a-l*b\),显然 F() 是随 l 增大单调递减的,如果对于某个 l 使得 F() >