二分天数+验证 #include<cstdio> #include<cstring> #include<cmath> #include<algorithm> using namespace std; +; int n,m,k; long long s; long long a[maxn],b[maxn],c[maxn]; int t[maxn]; long long A[maxn],B[maxn]; int preA[maxn],preB[maxn]; st…

题目链接: D. Gadgets for dollars and pounds time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Nura wants to buy k gadgets. She has only s burles for that. She can buy each gadget for dollars or…

D. Gadgets for dollars and pounds 题目连接: http://www.codeforces.com/contest/609/problem/C Description Nura wants to buy k gadgets. She has only s burles for that. She can buy each gadget for dollars or for pounds. So each gadget is selling only for som…

D. Gadgets for dollars and pounds time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Nura wants to buy k gadgets. She has only s burles for that. She can buy each gadget for dollars or for po…

D. Gadgets for dollars and pounds time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Nura wants to buy k gadgets. She has only s burles for that. She can buy each gadget for dollars or for po…

Nura wants to buy k gadgets. She has only sburles for that. She can buy each gadget for dollars or for pounds. So each gadget is selling only for some type of currency. The type of currency and the cost in that currency are not changing. Nura can buy…

对于这题笔者无解,只有手抄一份正解过来了: 基本思想就是 : 二分答案,对于第x天,计算它最少的花费f(x),<=s就是可行的,这是一个单调的函数,所以可以二分. 对于f(x)的计算,我用了nlog(n)的算法,遍历m个商品,用c[i]乘以前x天里,第t[i]种货币的最便宜的价格,存放到一个数组里,之后排序,计算前k个的和就是f(x) 前x天里,第t[i]种货币的最便宜的价格是通过预处理得到的,很容易的计算一下前缀最小值就行了. 贴代码吧: #include <iostream> #in…

传送门:http://codeforces.com/problemset/problem/609/D (如需转载,请注明出处,谢谢O(∩_∩)O) 题意: Nura想买k个小玩意,她手上有 s 个burles(一种货币),有m个小玩意供她选择购买,但每个小玩意只能用dollars或者pounds来购买,所以每次购买的时候Nura都要通过汇率将她手上的burles换成dollars或者pounds,而每一天的汇率又不一样,给出n天,并且这n天中burles换成dollars和pounds的比率,问…

A. USB Flash Drives 水题,排序即可 ]; int main() { int n,m; scanf("%d%d",&n,&m); ;i<n;i++) scanf("%d",&a[i]); ; sort(a,a+n); ;m>;i--) ans++,m-=a[i]; cout<<ans<<endl; } B. The Best Gift 本来以为要缩点,结果m<10,具体看代码 ];…

Unit 14 Money and Finance 线图写作技巧 1.Model1对应图片分析 The graph contains information about the price in US dollars of a barrel of oil from 1995 with predictions to 2015. 2.Model1范文分析 Model 1 The graph shows oil prices in dollars per barrel from 1995 with f…