foo.cc: In function 'int main()':
foo.cc:17:11: warning: ignoring return value of 'int system(const char*)', declared with attribute warn_unused_result [-Wunused-result]
     system("pause");
     ~~~~~~^~~~~~~~~
foo.cc: In function 'int find(int*, int)':
foo.cc:45:5: warning: 'tmp[0]' may be used uninitialized in this function [-Wmaybe-uninitialized]
  num=tmp[0];
  ~~~^~~~~~~

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