Compilare: user.cpp: In function ‘int main()’: user.cpp:36:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j <= x.size() - 1; ++j) { ^ user.cpp:70:44: warning: ‘r_3’ may be used uninitialized in this function [-Wmaybe-uninitialized] fout << r_1 << " " << r_2 << " " << r_3; ^ user.cpp:70:27: warning: ‘r_2’ may be used uninitialized in this function [-Wmaybe-uninitialized] fout << r_1 << " " << r_2 << " " << r_3; ^ user.cpp:70:13: warning: ‘r_1’ may be used uninitialized in this function [-Wmaybe-uninitialized] fout << r_1 << " " << r_2 << " " << r_3; ^