Compilare: user.cpp: In member function ‘opfstream& opfstream::operator<<(char)’: user.cpp:33:5: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:79:51: warning: narrowing conversion of ‘xp’ from ‘int’ to ‘long long unsigned int’ inside { } [-Wnarrowing] cs.push_back(constraint { xp, xc, true}); ^ user.cpp:79:51: warning: narrowing conversion of ‘xc’ from ‘int’ to ‘long long unsigned int’ inside { } [-Wnarrowing] user.cpp:84:52: warning: narrowing conversion of ‘xp’ from ‘int’ to ‘long long unsigned int’ inside { } [-Wnarrowing] cs.push_back(constraint { xp, xc, false}); ^ user.cpp:84:52: warning: narrowing conversion of ‘xc’ from ‘int’ to ‘long long unsigned int’ inside { } [-Wnarrowing] user.cpp:96:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < cs.size(); ++i){ ^ user.cpp:103:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(nr_good == cs.size()){ ^ user.cpp:110:66: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] (cs[ind].x / cur_val) == (cs[ind].y / cur_val)); ^