Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:22:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[x].size(); ++i) ^ user.cpp: In function ‘void dfst(int)’: user.cpp:32:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<vt[x].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:62:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<comp[i].size(); ++j) ^