不要用sqrt，容易TLE,i*i就行
````cpp
for(int i=2;i*i<=a[i];i++)
if(a[i]%i==0) continue;
cout<<a[i]<<' ';
``````
by gaojizhe05 @ 2023-11-19 11:39:55
@[WFong](/user/1089320)
by gaojizhe05 @ 2023-11-19 11:42:16