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UVA11616.cpp
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UVA11616.cpp
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#include <iostream>
#include <string>
#include <map>
#include <sstream>
using namespace std;
string arabicToRoman(int arabic) {
static int romanValues[13] = { 1000, 900, 500, 400, 100, 90,
50, 40, 10, 9, 5, 4, 1 };
static string romanStrings[13] = { "M", "CM", "D", "CD", "C",
"XC", "L", "XL", "X", "IX",
"V", "IV", "I" };
string result;
for(int i = 0; i < 13; ++i) {
if (arabic == 0)
break;
int times = arabic / romanValues[i];
arabic -= times * romanValues[i];
for(int j = 0; j < times; ++j)
result += romanStrings[i];
}
return result;
}
int romanToArabic(const string& roman) {
map<char, int> romanValues;
romanValues['M'] = 1000;
romanValues['D'] = 500;
romanValues['C'] = 100;
romanValues['L'] = 50;
romanValues['X'] = 10;
romanValues['V'] = 5;
romanValues['I'] = 1;
int result = 0;
for(int i = 0; i < roman.size(); ++i) {
int value = romanValues[roman[i]];
if (i < roman.size() - 1 &&
value < romanValues[roman[i + 1]])
result -= value;
else
result += value;
}
return result;
}
bool isArabic(const string& number) {
return number[0] >= '0' && number[0] <= '9';
}
int stringToInt(const string& number) {
istringstream input(number);
int result;
input >> result;
return result;
}
int main() {
string number;
while(cin >> number) {
if (isArabic(number))
cout << arabicToRoman(stringToInt(number)) << '\n';
else
cout << romanToArabic(number) << '\n';
}
}