Compilare: user.cpp: In function ‘int main()’: user.cpp:81:11: warning: unused variable ‘mn1’ [-Wunused-variable] int mn1 = 1 << 30; ^ user.cpp:131:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < vec.size(); ++i) ^ user.cpp:106:5: warning: ‘xz’ may be used uninitialized in this function [-Wmaybe-uninitialized] for (int i = xz; i <= xu; ++i) ^