Compilare: user.cpp: In function ‘int dfs()’: user.cpp:35:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[x].size();++i) ^ user.cpp: In function ‘int main()’: user.cpp:53:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<s.size();++i) ^ user.cpp:92:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[D].size();++i) ^ user.cpp:112:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[x].size();++j) ^ user.cpp:124:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<s.size();++i) ^