blob: 1f7972347d540afafb8fc216140c113cf734f425 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
|
#include <cmath>
#include <iomanip>
#include <iostream>
#include <regex>
#include <string>
int main() {
std::string input;
std::getline(std::cin, input);
std::regex reg(R"aaa((\d+)([GMK]?B)=\?([GMK]?B))aaa");
std::smatch match;
std::regex_match(input, match, reg);
std::string original_number_str = match[1].str();
std::string original_unit = match[2].str();
std::string target_unit = match[3].str();
double original_number = std::stod(original_number_str);
auto to_ratio = [](const std::string s) -> double {
if (s.size() == 1)
return 1;
if (s[0] == 'G')
return std::pow(2, 30);
if (s[0] == 'M')
return std::pow(2, 20);
return std::pow(2, 10);
};
double original_ratio = to_ratio(original_unit);
double target_ratio = to_ratio(target_unit);
std::cout << std::fixed << std::setprecision(6)
<< (original_number * original_ratio / target_ratio);
return 0;
}
|
