foo.cc: In function 'int Hebin(int*, int, int*, int, int*, int)':
foo.cc:41:7: warning: statement has no effect [-Wunused-value]
  for(i; i<n; i++)
       ^
foo.cc:43:7: warning: statement has no effect [-Wunused-value]
  for(j; j<m; j++)
       ^

自豪的采用HydroJudge(https://github.com/hydro-dev/Hydro)进行评测。