/in/foo.cc: In function 'long long int dj2(int)':
/in/foo.cc:60:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (j=0;j<w[minn].size();++j)
            ~^~~~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:71:15: warning: unused variable 'j' [-Wunused-variable]
  int tb,l,r,i,j,a,c,b;
               ^