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] } ^ In file included from /usr/include/c++/4.8/cassert:43:0, from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:33, from user.cpp:1: user.cpp: In lambda function: user.cpp:70:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(ind < cs.size()); ^ user.cpp:72:77: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] const auto rez = equiv(cs[ind].eq, (cs[ind].x / x) == (cs[ind].y / x)); ^ user.cpp: In function ‘int main()’: user.cpp:100:51: warning: narrowing conversion of ‘xp’ from ‘int’ to ‘long long unsigned int’ inside { } [-Wnarrowing] cs.push_back(constraint { xp, xc, true}); ^ user.cpp:100:51: warning: narrowing conversion of ‘xc’ from ‘int’ to ‘long long unsigned int’ inside { } [-Wnarrowing] user.cpp:109:52: warning: narrowing conversion of ‘xp’ from ‘int’ to ‘long long unsigned int’ inside { } [-Wnarrowing] cs.push_back(constraint { xp, xc, false}); ^ user.cpp:109:52: warning: narrowing conversion of ‘xc’ from ‘int’ to ‘long long unsigned int’ inside { } [-Wnarrowing] user.cpp:136:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(nr_good == cs.size()){ ^