合并过的那堆果子有可能比之前有的要大。
Hack:
```
5
1 2 3 4 5
```
Output:
```
49
```
Answer:
```
33
```
by __LiChangChao__ @ 2023-06-03 21:56:00
所以应该合并当前最小的两堆果子。
by __LiChangChao__ @ 2023-06-03 21:57:08