Compilare: main.cpp: In function 'void dfs(int)': main.cpp:16:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[vf].size(); ++i) ~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:57:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<v[i].size(); ++j) ~^~~~~~~~~~~~ main.cpp:86:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<v[i].size(); ++j) ~^~~~~~~~~~~~