hdu 1070 milk

Milk

Time Limit : 2000/1000ms (Java/Other)   Memory Limit : 65536/32768K (Java/Other)

Total Submission(s) : 38   Accepted Submission(s) : 21

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Problem Description

Ignatius drinks milk everyday, now he is in the supermarket and he wants to choose a bottle of milk. There are many kinds of milk in the supermarket, so Ignatius wants to know which kind of milk is the cheapest.

Here are some rules:
1. Ignatius will never drink the milk which is produced 6 days ago or earlier. That means if the milk is produced 2005-1-1, Ignatius will never drink this bottle after 2005-1-6(inclusive).
2. Ignatius drinks 200mL milk everyday.
3. If the milk left in the bottle is less than 200mL, Ignatius will throw it away.
4. All the milk in the supermarket is just produced today.

Note that Ignatius only wants to buy one bottle of milk, so if the volumn of a bottle is smaller than 200mL, you should ignore it.
Given some information of milk, your task is to tell Ignatius which milk is the cheapest.

Input

The input contains several test cases. The first line of the input is a single integer T which is the number of test cases. T test cases follow.
Each test case starts with a single integer N(1<=N<=100) which is the number of kinds of milk. Then N lines follow, each line contains a string S(the length will at most 100 characters) which indicate the brand of milk, then two integers for the brand: P(Yuan) which is the price of a bottle, V(mL) which is the volume of a bottle.

Output

For each test case, you should output the brand of the milk which is the cheapest. If there are more than one cheapest brand, you should output the one which has the largest volume.

Sample Input

22Yili 10 500Mengniu 20 10004Yili 10 500Mengniu 20 1000Guangming 1 199Yanpai 40 10000

Sample Output

Mengniu
Mengniu
这道题也是感觉和背包没关系的，用结构排序就可以做了，根据价格排序，若价格相同则根据体积排序，注意若体积小于200，则应该人为将单价改成无限大。
#include<iostream>#include<cmath>#include<algorithm>#include<iomanip>#include<cstring>#include<cstdio>#include<queue>using namespace std;struct milk{    char na[111];    int price;    int vol;    double pp;};bool cmp1(milk x,milk y){    if(x.pp==y.pp)return x.vol>y.vol;    return x.pp<y.pp;}int main(){          int n;     cin>>n;     while(n--)     {         int m;         cin>>m;         int i,j,k;         milk st[111];         for(i=1;i<=m;i++)         {             cin>>st[i].na>>st[i].price>>st[i].vol;             if(st[i].vol<200)             st[i].pp=99999999;             else if(st[i].vol<=1200)             st[i].pp=st[i].price*1.0/(st[i].vol*1.0/200);             else st[i].pp=st[i].price*1.0/(1200*1.0/200);         }         sort(st+1,st+1+m,cmp1);         cout<<st[1].na<<endl;     }    return 0;}