Compilare: main.cpp: In function 'void dfs(int)': main.cpp:25:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[nod].size(); ++i) ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:57:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < tr[st].size(); ++i) ~~^~~~~~~~~~~~~~~ main.cpp:68:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < tr[adv[i]].size(); ++j) ~~^~~~~~~~~~~~~~~~~~~