```cpp
using namespace std;
```
by oliver326 @ 2023-10-19 18:10:29
```
using namespace std
```
by TianLuen @ 2023-10-19 18:10:44
```
或者把 cin 改成 std::cin
或者把 cin>>t 改成 scanf("%d",&t);
```
by oliver326 @ 2023-10-19 18:14:02
```cpp
using namespace std;
```
by DioxygenDifluoride @ 2023-10-19 18:23:36
@[ruanweijie](/user/726291)
by DioxygenDifluoride @ 2023-10-19 18:24:10