Compilare: user.cpp: In function ‘void make()’: user.cpp:216:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < old.size(); ++i) { ^ user.cpp:219:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (p >= sol.size() or sol[p] != old[i]) ^ user.cpp:223:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < sol.size(); ++i) { ^ user.cpp:226:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (p >= old.size() or old[p] != sol[i]) ^ user.cpp: In function ‘int main()’: user.cpp:257:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (sol.size() * 2 != have) { ^