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11616.cpp
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11616.cpp
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#include <iostream>
#include <sstream>
#include <string>
#include <cstring>
#include <cctype>
using namespace std;
int valueOf(char c) {
switch(c) {
case 'M': return 1000;
case 'D': return 500;
case 'C': return 100;
case 'L': return 50;
case 'X': return 10;
case 'V': return 5;
case 'I': return 1;
default: return 0;
}
}
int romanToDecimal(string S) {
int decimalNumeral = 0;
S += "0";
for(int i = 0; i + 1 < S.length(); i++) {
int current = valueOf(S[i]);
int next = valueOf(S[i + 1]);
if(current >= next) decimalNumeral += current;
else decimalNumeral -= current;
}
return decimalNumeral;
}
string decimalToRoman(int value) {
string roman[13] = {"M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"};
int decimal[13] = {1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1};
string romanNumeral = "";
/*
if (value <= 0 || value >= 4000)
return value;
*/
for (int i = 0; i < 13; i++) {
while (value >= decimal[i]) {
value -= decimal[i];
romanNumeral += roman[i];
}
}
return romanNumeral;
}
int main() {
int I;
string S;
stringstream ss;
while (cin >> S) {
if (isdigit(S[0])) {
ss.clear();
ss << S;
ss >> I;
cout << decimalToRoman(I) << endl;
}
else {
cout << romanToDecimal(S) << endl;
}
}
return 0;
}