二分答案以下哪个模板会卡循环？

1. while(l<r)...l=mid or r=mid

2. while(l<r)...l=mid+1 or r=mid

3. while(l<r)...l=mid or r=mid-1

4. while(l<r)...l=mid+1 or r=mid-1

5. while(l<=r)... l=mid or r=mid

6. while(l<=r)... l=mid+1 or r=mid

7. while(l<=r)... l=mid or r=mid-1

8. while(l<=r)... l=mid+1 or r=mid-1