要不您把结构体里的指针换成野指针然后再注意一下取 $size$试试？
by hgzxgzx @ 2022-10-07 20:56:21
@[hgzxgzx](/user/545918) 调出来了，只是因为$merge$里面的
```cpp
v -> ch[0] = merge(u , v -> ch[0]);
```
写成了
```cpp
v -> ch[0] = merge(v -> ch[0] , u);
```
不好意思打扰了
by Sherlock___Holmes @ 2022-10-08 08:30:35
@[Sherlock___Holmes](/user/469345) ~~考咕~~
by int_R @ 2022-10-28 14:35:59
@[int_R](/user/469312) ？？？
by Sherlock___Holmes @ 2022-10-28 14:43:37