Compilare: user.cpp: In function ‘std::vector<int> discover()’: user.cpp:27:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < Transpose[x].size(); i++){ ^ user.cpp:19:9: warning: unused variable ‘i’ [-Wunused-variable] int i, x; ^ user.cpp: In function ‘int main()’: user.cpp:63:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(x = 0; x < sol.size(); x++){ ^