convert_submatrix

#include <fstream>
#include <cstring>
#define SMAX 100 /// (SMAX - 1) = lungimea maxima a sirului de caractere
using namespace std;

void convert_char(char chr,bool bin[8])
{
    for(int i=0;i<8;++i)
        bin[7-i]=chr&(1<<i);
}

void convert_string(char* s,bool bin[SMAX][8])
{
    for(int i=0;s[i];++i)
        convert_char(s[i],bin[i]);
}

int ij_length(int x,int y,bool m[SMAX][8],int i,int j)
{
    int len,k;
    for(len=2;i+len<=x&&j+len<=y;++len)
        for(k=0;k<len;++k)
        {
            if(m[i+k][j+len-1]!=m[i][j])
                return len-1;
            if(m[i+len-1][j+k]!=m[i][j])
                return len-1;
        }
    return len-1;
}

int submatrix_size(int x,int y,bool m[SMAX][8]) {
    int len,sol=0;
    for(int i=0;i<x;++i)
        for(int j=0;j<y;++j)
        {
            len=ij_length(x,y,m,i,j);
            if(len>sol)
                sol=len;
        }
    return sol;
}

char str[SMAX];
bool mat[SMAX][8];

int main()
{
    ifstream f("convert_submatrix.in");
    f>>str;
    convert_string(str,mat);
    ofstream g("convert_submatrix.out");
    g<<submatrix_size(strlen(str),8,mat)<<'\n';
    return 0;
}