/in/foo.cc: In function 'void topsort()':
/in/foo.cc:43:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i=0;i<g[x].size();i++){
                     ~^~~~~~~~~~~~

VJ4Error('ProblemDataNotFoundError', 'Data of problem 590c9911d3d8a132109939d6 not found.', 'newbzoj', '590c9911d3d8a132109939d6')