Compilare: user.cpp: In function ‘int main()’: user.cpp:49:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[v[0]].size(); ++i){ ^ user.cpp:60:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[v[0]].size(); ++i){ ^ user.cpp:68:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[v[2]].size(); ++i){ ^ user.cpp:80:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v.size(); ++i){ ^ user.cpp:83:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < G[v[i]].size(); ++j){ ^ user.cpp:93:30: warning: ‘sol_2’ may be used uninitialized in this function [-Wmaybe-uninitialized] g << min(sol_1, sol_2) << ' ' << max(sol_1, sol_2) << '\n'; ^