Compilare: user.cpp: In function ‘int numar(const std::vector<cerc>&)’: user.cpp:67:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v.size(); i++) ^ user.cpp:77:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v.size(); i++) ^ user.cpp:66:9: warning: unused variable ‘nr’ [-Wunused-variable] int nr, n, dinam[2020], ok; ^ user.cpp:66:13: warning: unused variable ‘n’ [-Wunused-variable] int nr, n, dinam[2020], ok; ^ user.cpp:66:29: warning: unused variable ‘ok’ [-Wunused-variable] int nr, n, dinam[2020], ok; ^ user.cpp: In function ‘void solve()’: user.cpp:111:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < mat.size(); i++) ^