/in/foo.cc: In function 'int main()':
/in/foo.cc:23:38: warning: format '%d' expects argument of type 'int', but argument 3 has type 'std::vector<int>::size_type {aka long unsigned int}' [-Wformat=]
      printf("%d %d",fa[x],g[x].size());
                                      ^
/in/foo.cc:24:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
      for(int k=0;k<g[x].size();k++)
                  ~^~~~~~~~~~~~
/in/foo.cc:12:14: warning: unused variable 'y' [-Wunused-variable]
    int f,s,x,y;
              ^