cifre_romane1

#include <cstdio>
#define LMAX 1000
#include <cstring>
using namespace std;
char roman[]="MDCLXVI ";
int arab[]={1000,500,100,50,10,5,1,0};

int conv(char c)
{
    int j=0;
    while(roman[j++]!=c&&j<8)
        ;
    if(j<8)
        return arab[--j];
    else
        return -1;
}

int main()
{
    char nrom[LMAX];
    int narab=0;
    int crt,urm;
    FILE *f=fopen("cifre_romane1.in","r");
	fscanf(f,"%s",nrom);
	FILE *g=fopen("cifre_romane1.out","w");
    /// Admise IV, IX, XL, XC, CD, CM
	if(strstr(nrom,"IIII")||strstr(nrom,"XXXX")||strstr(nrom,"CCCC")||strstr(nrom,"MMMM")
        ||strstr(nrom,"VV")||strstr(nrom,"LL")||strstr(nrom,"DD")
        ||strstr(nrom,"IIV")||strstr(nrom,"IIIV")
        ||strstr(nrom,"IIX")||strstr(nrom,"IIIX")
        ||strstr(nrom,"IL")||strstr(nrom,"IIL")||strstr(nrom,"IIIL")
        ||strstr(nrom,"IC")||strstr(nrom,"IIC")||strstr(nrom,"IIIC")
        ||strstr(nrom,"ID")||strstr(nrom,"IID")||strstr(nrom,"IIID")
        ||strstr(nrom,"IM")||strstr(nrom,"IIM")||strstr(nrom,"IIIM")
        ||strstr(nrom,"VX")||strstr(nrom,"VL")
        ||strstr(nrom,"VC")||strstr(nrom,"VD")||strstr(nrom,"VM")
        ||strstr(nrom,"XXL")||strstr(nrom,"XXXL")
        ||strstr(nrom,"XXC")||strstr(nrom,"XXXC")
        ||strstr(nrom,"XD")||strstr(nrom,"XXD")||strstr(nrom,"XXXD")
        ||strstr(nrom,"XM")||strstr(nrom,"XXM")||strstr(nrom,"XXXM")
        ||strstr(nrom,"LC")
        ||strstr(nrom,"CCD")||strstr(nrom,"CCCD")
        ||strstr(nrom,"CCM")||strstr(nrom,"CCCM")
        ||strstr(nrom,"DM"))
    {
        fprintf(g,"%s","Numar invalid");
        return 0;
    }
	int n=strlen(nrom);
	nrom[n]=' ',nrom[n+1]='\0';
    ++n;
    for(int i=0;i<n-1;++i)
    {
        crt=conv(nrom[i]);
        urm=conv(nrom[i+1]);
        if(crt>=urm)
          narab+=crt;
        else
          narab-=crt;
    }
    fprintf(g,"%d",narab);;
    return 0;
}