Римские числа http://www.e-olimp.com/problems/4103

4103.cpp

#include <iostream>
#include <string>

unsigned getDecimal(char val)
{
	switch (val) {
		case 'I': return 1;
		case 'V': return 5;
		case 'X': return 10;
		case 'L': return 50;
		case 'C': return 100;
		case 'D': return 500;
		case 'M': return 1000;
		default: throw "Undefined character!";
	}

	return val;
}

unsigned getInt(std::string s)
{
	unsigned n = 0, result = 0, last = 0, tmp = 0;
	size_t len = s.size();
	for (int i = len - 1; 0 <= i; --i) {
		tmp = getDecimal(s[i]);
		if (tmp < last) {
			result -= tmp;
		} else {
			result += tmp;
		}
		last = tmp;
	}
	
	return result;
}
 
int main()
{
	#ifdef _DEBUG
		freopen("input.txt", "r", stdin);
		freopen("output.txt", "w", stdout);
	#endif
	int n;
	std::string s;
	std::cin>> n;
	for (int i=0; i < n; ++i) {
		std::cin>> s;
		std::cout<< getInt(s) <<std::endl;
	}
}

http://www.e-olimp.com/problems/4103