Compilare: user.cpp: In function ‘int dfs(int)’: user.cpp:23:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:37:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=r;i++, g<<'\n')for(int j=0;j<rs[i].size(); j++)g<<rs[i][j]<<' '; ~^~~~~~~~~~~~~