hdu4788 水题 Hard Disk Drive (2013 Asia Chengdu Regional Contest problem H)

题意：一个人认为B、MB、GB、TB……是1000进制，另一个认为是1024进制，给你一个存储量，例如100[MB]，问你两种理解方式差了百分之多少，分母是1024的。

思路：每递增一个级别，就乘个1000/1024就行了

Hard Disk Drive

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 2146    Accepted Submission(s): 1172

Problem Description

　　Yesterday your dear cousin Coach Pang gave you a new 100MB hard disk drive (HDD) as a gift because you will get married next year.
　　But you turned on your computer and the operating system (OS) told you the HDD is about 95MB. The 5MB of space is missing. It is known that the HDD manufacturers have a different capacity measurement. The manufacturers think 1 “kilo” is 1000 but the OS thinks that is 1024. There are several descriptions of the size of an HDD. They are byte, kilobyte, megabyte, gigabyte, terabyte, petabyte, exabyte, zetabyte and yottabyte. Each one equals a “kilo” of the previous one. For example 1 gigabyte is 1 “kilo” megabytes.
　　Now you know the size of a hard disk represented by manufacturers and you want to calculate the percentage of the “missing part”.

 

Input

　　The first line contains an integer T, which indicates the number of test cases.
　　For each test case, there is one line contains a string in format “number[unit]” where number is a positive integer within [1, 1000] and unit is the description of size which could be “B”, “KB”, “MB”, “GB”, “TB”, “PB”, “EB”, “ZB”, “YB” in short respectively.

 

Output

　　For each test case, output one line “Case #x: y”, where x is the case number (starting from 1) and y is the percentage of the “missing part”. The answer should be rounded to two digits after the decimal point.

 

Sample Input

   
   
   
   

    
    
    
    2
100[MB]
1[B]
   
   
   
   

 

Sample Output

   
   
   
   

    
    
    
    Case #1: 4.63%
Case #2: 0.00%


    
    
    
    
 
     
 
      Hint 
     
 
      
    
    
    
    
     
   
   
   
   

 

Source

2013 Asia Chengdu Regional Contest

#include <iostream>
#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include <string>
#include <string.h>
#include <algorithm>
#include <vector>
#include <queue>
#include <set>
#include <map>
#include <stack>
using namespace std;
typedef long long LL;
const int INF=0x7fffffff;
const int MAX_N=10000;

int T,a;
char A[10];
double B[20];
int main(){
    B[0]=1;
    for(int i=1;i<=8;i++){
        B[i]=B[i-1]*(1000*1.0/(1024*1.0));
    }
    cin>>T;
    int t=T;
    int ans;
    while(T--){
        scanf("%d%s",&a,A);
        char c=A[1];
        if(c=='B'){
            ans=0;
        }
        else if(c=='K')ans=1;
        else if(c=='M')ans=2;
        else if(c=='G')ans=3;
        else if(c=='T')ans=4;
        else if(c=='P')ans=5;
        else if(c=='E')ans=6;
        else if(c=='Z')ans=7;
        else if(c=='Y')ans=8;


        printf("Case #%d: %.2lf%%\n",t-T,100-B[ans]*100);
    }
    return 0;
}