p4

int problema4(const char *input_file_name, int N)
{
    char chr[] = " .,-;:'""()?!", ss[2000]="";
    ifstream fin(input_file_name);
    while(fin.get(s, 256))
    {
        int n = strlen(s);
        for(int i = 0; i<(int)strlen(s); i++)
        {
                while(i<n && strchr(chr, s[i]))
                {
                    for(ui j = i; j<strlen(s); j++)
                        s[j] = s[j+1];
                    n--;
                }
        }

        strcat(ss, s);
        fin.get();
    }

    if((int)strlen(ss) < N)
        N = strlen(ss);


    char s1[N], aux[N];
    ui poz = -1;

    strncpy(aux, ss, N);
    strncpy(s1, ss, N);
    for(int i = 0; i<N; i++)
    {
        char c[1];
        c[0] = s1[0];
        for(int j = 0; j<N-1; j++)
            s1[j] = s1[j+1];
        s1[N-1] = c[0];
        //cout << s1 << endl;
        if(strcmp(aux, s1) > 0)
        {
            strncpy(aux, s1, N);
            poz = i + 1;
        }
    }
    return poz;
}