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#include<bits/stdc++.h>
#define mod 1000000007
#define ll long long
using namespace std;
int dem=0,n;
char a[101][101];
string s[1000];
string convert(string temp){
	string res="";
	int n=temp.length();
	if(n%3) temp.insert(0,3-n%3,'0');
	for(int i=0;i<n;i+=3){
		int t=0;
		for(int j=0;j<3;j++){
			t+=(temp[j+i]-'0')*pow(2,2-j);
		}
		t=(int) t;
		res+=(char)('0'+t);
	}
	return res;
}
void move(int x,int y,string temp){
	if(x==n-1&&y==n-1){
		temp=temp+(char)(a[x][y]);
		s[dem]=temp;
		dem++;
	}
	else if(x<n&&y<n){
		if((a[x][y+1]=='0')||(a[x+1][y]=='0')){
			if(a[x][y+1]=='0'){
				move(x,y+1,temp+(char)a[x][y]);
			}
			else move(x+1,y,temp+(char)a[x][y]);
		}
		else{
			move(x,y+1,temp+(char)a[x][y]);
			move(x+1,y,temp+(char)a[x][y]);
		}
	}
}
int main(){
	ios_base::sync_with_stdio(false);
	cin>>n;
	for(int i=0;i<n;i++){
		for(int j=0;j<n;j++) cin>>a[i][j];
	}
	move(0,0,"");
	// sort(s,s+dem);
	cout<<convert(*min_element(s,s+dem));
}

In file included from /usr/include/c++/6/bits/char_traits.h:39:0,
                 from /usr/include/c++/6/ios:40,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from /usr/include/c++/6/complex:45,
                 from /usr/include/c++/6/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52,
                 from prog.cpp:1:
/usr/include/c++/6/bits/stl_algobase.h: In instantiation of ‘_OI std::__copy_move_a(_II, _II, _OI) [with bool _IsMove = true; _II = int; _OI = const char*]’:
/usr/include/c++/6/bits/stl_algobase.h:422:45:   required from ‘_OI std::__copy_move_a2(_II, _II, _OI) [with bool _IsMove = true; _II = int; _OI = const char*]’
/usr/include/c++/6/bits/stl_algobase.h:487:39:   required from ‘_OI std::move(_II, _II, _OI) [with _II = int; _OI = const char*]’
prog.cpp:47:13:   required from here
/usr/include/c++/6/bits/stl_algobase.h:377:57: error: no type named ‘value_type’ in ‘struct std::iterator_traits<int>’
       typedef typename iterator_traits<_II>::value_type _ValueTypeI;
                                                         ^~~~~~~~~~~
/usr/include/c++/6/bits/stl_algobase.h:379:64: error: no type named ‘iterator_category’ in ‘struct std::iterator_traits<int>’
       typedef typename iterator_traits<_II>::iterator_category _Category;
                                                                ^~~~~~~~~
/usr/include/c++/6/bits/stl_algobase.h:383:9: error: no type named ‘value_type’ in ‘struct std::iterator_traits<int>’
       const bool __simple = (__is_trivial(_ValueTypeI)
                             ~~~~~~~~~~~~~~~~~~~~~~~~~~
                       && __is_pointer<_II>::__value
                       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                       && __is_pointer<_OI>::__value
                       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
         && __are_same<_ValueTypeI, _ValueTypeO>::__value);
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/6/bits/stl_algobase.h:386:44: error: no type named ‘iterator_category’ in ‘struct std::iterator_traits<int>’
       return std::__copy_move<_IsMove, __simple,
              ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                        _Category>::__copy_m(__first, __last, __result);
                        ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

Standard output is empty