```cpp
return node(n,sum);
by Salt_conch @ 2024-04-12 19:21:47
@[gao_shou](/user/1034531)
by Salt_conch @ 2024-04-12 19:22:49
@[c20251735czyawa](/user/1266934) 谢谢
by gao_shou @ 2024-04-13 08:42:11