input
```cpp
45 1
```
output
```
07:05
```
by 天南星魔芋 @ 2023-06-19 12:49:11
@[bibobibo](/user/949871) 输出都要是`%02d`
by Tjaweiof @ 2023-06-19 13:05:21
所有的"%02d:%2d"改为"%02d:%02d"就行
by duanxiaobing @ 2023-06-19 13:05:45