Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:14:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[x].size();++i) ^ user.cpp: In function ‘int go(int, int)’: user.cpp:34:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<q[x].size();++i) ^ user.cpp:46:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<q[x].size();++i) ^