foo.cc: In function 'int main()':
foo.cc:8:2: error: break statement not within loop or switch
  break;
  ^~~~~
foo.cc:9:2: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
  if(a+c<=b)cout<<"NO"<<endl;break;
  ^~
foo.cc:9:29: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
  if(a+c<=b)cout<<"NO"<<endl;break;
                             ^~~~~
foo.cc:9:29: error: break statement not within loop or switch
foo.cc:10:2: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
  if(b+c<=a)cout<<"NO"<<endl;break;
  ^~
foo.cc:10:29: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
  if(b+c<=a)cout<<"NO"<<endl;break;
                             ^~~~~
foo.cc:10:29: error: break statement not within loop or switch
foo.cc:11:2: error: 'else' without a previous 'if'
  else
  ^~~~

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