Compilare: user.cpp: In function ‘void solve(int)’: user.cpp:214:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = d; i<graf[nod].size(); ++i) ^ user.cpp:229:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i<graf[nod].size(); ++i) ^ user.cpp:246:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i<graf[nod].size(); ++i) ^