orz
by Motbloveut221 @ 2020-05-12 08:44:58
a[i]*a[i-1] 爆int
by 狡狐 @ 2020-07-15 11:36:28
```cpp
ll a[N]
scanf("%lld,a+i) is ok
```
by 半杯星光 @ 2021-09-21 14:35:24