foo.cc: In function 'int main()':
foo.cc:6:36: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  if(a+b<c||a+c<b||b+c<a||a==0&&b==0&&c==0)
                          ~~~~~~~~~~^~~~~~

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