运行 ID: 345033

Main.cc: In function ‘int main()’:
Main.cc:10:17: error: ‘sqrt’ was not declared in this scope
  for(int i=2;i<=sqrt(n);i++){
                 ^~~~
Main.cc:10:17: note: suggested alternative: ‘qsort’
  for(int i=2;i<=sqrt(n);i++){
                 ^~~~
                 qsort