Compilare: main.cpp: In function 'void dfs(int)': main.cpp:26:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[x].size();i++) ~^~~~~~~~~~~~ main.cpp:50:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[x].size();i++) ~^~~~~~~~~~~~ main.cpp:60:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i==v[x].size()) ~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:83:13: warning: overflow in implicit constant conversion [-Woverflow] res=LONG_MIN; ^~~~~~~~