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  1. #include <iostream>
  2. #include <string>
  3.  
  4. using namespace std;
  5.  
  6. int rome2arab(string r) {
  7.   int p = 0, d = 0, v;
  8.  
  9.   for (auto i : r) {
  10.     switch (i) {
  11.     case 'M': v = 1000; break; case 'D': v = 500; break;
  12.     case 'C': v = 100; break;  case 'L': v = 50; break;
  13.     case 'X': v = 10; break;   case 'V': v = 5; break;
  14.     case 'I': v = 1; break;    default: throw "error"; }
  15.  
  16.     if (p && p < v)
  17.       d -= 2 * p, p = 0;
  18.     else
  19.       p = v;
  20.     d += v;
  21.   }
  22.  
  23.   return d;
  24. }
  25.  
  26. int main (void) {
  27.   string x;
  28.  
  29.   cin  >> x;
  30.   cout << rome2arab(x);
  31.  
  32.   return 0;
  33. }
Success #stdin #stdout 0s 3032KB
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https://ideone.com/9pXuM1
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
secret

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