Compilare: user.cpp: In function ‘int dfs(int, int)’: user.cpp:26:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<v[nod].size(); j++) ~^~~~~~~~~~~~~~ user.cpp:53:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<v[nod].size() && ok==0; j++) ~^~~~~~~~~~~~~~ user.cpp:66:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:86:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<cri[0].size(); i++) ~^~~~~~~~~~~~~~