Eroare de compilare: user.cpp: In function ‘void print()’: user.cpp:19:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<s.size(); i+=2) ^ user.cpp: In function ‘void back(const short int&)’: user.cpp:33:69: error: expected ‘)’ before ‘]’ token if ( ok(x, y) && a[x][y] && ok(x1, y1) && !a[x1]][y1] ) ^ user.cpp:33:69: error: expected primary-expression before ‘]’ token user.cpp:33:69: error: expected ‘;’ before ‘]’ token