Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:18:18: 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:111:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<q[ i ].size();j++) ^ user.cpp:140:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<q[ i ].size();j++) ^