Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:15:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<g[x].size();i++) ^ user.cpp: In function ‘void dfs1(int)’: user.cpp:26:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<gt[x].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:60:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<a[i].size();j++) ^