foo.cc: In function 'void Maintain()':
foo.cc:50:6: warning: unused variable 'cnt' [-Wunused-variable]
  int cnt=0;
      ^~~

自豪的采用jd5进行评测(github.com/masnn/jd5)

{"receive":"2020-02-18T02:56:41.155Z","handle":"2020-02-18T02:56:41.155Z","cache_start":"2020-02-18T02:56:41.155Z","read_cases":"2020-02-18T02:57:08.569Z","judge":"2020-02-18T02:57:08.570Z","done":"2020-02-18T02:57:12.449Z"}