foo.cc: In function 'int main()':
foo.cc:4:16: warning: unused variable 'tot' [-Wunused-variable]
  int beg, end, tot=0;
                ^~~

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

正在同步测试数据，请稍后
{"receive":"2020-08-15T01:26:05.796Z","handle":"2020-08-15T01:26:05.796Z","cache_start":"2020-08-15T01:26:05.802Z","read_cases":"2020-08-15T01:26:06.396Z","judge":"2020-08-15T01:26:06.397Z","done":"2020-08-15T01:26:07.537Z"}