foo.cc: In function 'int read()':
foo.cc:7:28: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
  while(isdigit(ch))res=(res+(res<<2)<<1)+(ch^48),ch=getchar();
                         ~~~^~~~~~~~~
foo.cc: In function 'double Circle::around(int, int, int)':
foo.cc:76:2: warning: control reaches end of non-void function [-Wreturn-type]
  }
  ^

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。