Compilare: user.cpp: In function ‘int main()’: user.cpp:73:16: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if ( fv [ i ] [ j ] == 3 or fv [ i ] [ j ] == 2 ) ^ user.cpp:80:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( register int i = 0 ; i < rs.size () ; ++ i ) ^ user.cpp:83:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( register int i = 0 ; i < as.size () ; ++ i ) ^