virus

#include <fstream>
#include <cstring>
#define DMAX 102

using namespace std;
ifstream fin("virus.in");
ofstream fout("virus.out");
char ceroare[]= {1,3,7,15,31,63,127,0};
int n, m, cerinta, nr;
char a[DMAX][DMAX];
int biti[DMAX][DMAX];

void citire();
int transforma();
bool gata();
int numara(char x);
char schimba (char x);
char schimbamaxim (char x);

int main()
{
    citire();
    if (cerinta==1)
        fout<<transforma()<<'\n';
    else
    {
        while (!gata())
        {
            transforma();
            nr++;
        }
        fout<<nr<<'\n';
    }
    return 0;
}

void citire()
{
    int i, j;
    fin>>n>>m;
    fin.get();
    for (i=1; i<=n; i++)
    {
        for (j=1; j<=m; j++)
        {
            fin.get(a[i][j]);
            if (strchr(ceroare,a[i][j]))
                a[i][j]=0;
        }
        fin.get();
    }
    fin>>cerinta;
}

bool gata()
{
    int i, j;
    for (i=1; i<=n; i++)
        for (j=1; j<=m; j++)
            if (a[i][j])
                return 0;
    return 1;
}

int transforma()
//returneaza numarul de caractere inatacabile obtinute
{
    int i, j, maxim=-1, rez=0;
    for (i=1; i<=n; i++)
        for (j=1; j<=m; j++)
        {
            biti[i][j]=numara(a[i][j]);
            if (biti[i][j]>maxim)
                maxim=biti[i][j];
        }
    for (i=1; i<=n; i++)
        for (j=1; j<=m; j++)
            if (biti[i][j])
            {
                if (biti[i][j]==maxim)
                    a[i][j]=schimbamaxim(a[i][j]);
                else
                    a[i][j]=schimba(a[i][j]);
                if (strchr(ceroare,a[i][j]))
                    a[i][j]=0;
                if (a[i][j]==0)
                    rez++;
            }
    return rez;
}

int numara(char x)
{
    int i, rez=0;
    for (i=0; i<8; i++)
    {
        rez+=x%2;
        x/=2;
    }
    return rez;
}

char schimba (char x)
{
    int v[8], i, rez=0;
    for (i=0; i<8; i++)
    {
        v[i]=x%2;
        x/=2;
    }
    for (i=0; v[i]; i++);
    v[i]=1;
    for (i=7; i>=0; i--)
        rez=rez*2+v[i];
    return rez;
}

char schimbamaxim (char x)
{
    int v[8], i, rez=0, cati;
    for (i=0; i<8; i++)
    {
        v[i]=x%2;
        x/=2;
    }
    for (i=7, cati=0; i>=0 && cati<2; i--)
        if (v[i])
        {
            v[i]=0;
            cati++;
        }
    for (i=7; i>=0; i--)
        rez=rez*2+v[i];
    return rez;
}