foo.cc: In function 'void solve(double, double)':
foo.cc:12:2: warning: this 'else' clause does not guard... [-Wmisleading-indentation]
  else printf(" %.2f",(e+s)/2);return;}
  ^~~~
foo.cc:12:31: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'else'
  else printf(" %.2f",(e+s)/2);return;}
                               ^~~~~~

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