foo.cc: In function 'int SPFA(int)':
foo.cc:64:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int z = 0; z < edge[x].size(); z++)
                   ~~^~~~~~~~~~~~~~~~

正在同步测试数据，请稍后
自豪的采用HydroJudge(https://github.com/hydro-dev/Hydro)进行评测。