教练 @[Hevix](/user/70863) 说是这里有问题
```cpp
friend bool operator <(route a,route b){a.cost < b.cost;}
```
by SCma @ 2024-04-06 15:36:16
@[SCma](/user/794146) 你没有返回值啊（应该为 `friend bool operator <(route a,route b){ return a.cost < b.cost;} `
by OldDriverTree @ 2024-04-06 15:40:11
@[SCma](/user/794146) 没返回值
by Loser_Syx @ 2024-04-06 15:40:59
@[OldDriverTree](/user/681036) 谢谢爸爸赐教
QAQ
by SCma @ 2024-04-06 15:41:25
《叫爸爸》，孩子你无敌了。
by HAM_qwq @ 2024-04-06 15:41:54
@[SCma](/user/794146) 你无敌了
by DASADI @ 2024-04-06 15:43:36
无敌了
by Super_Builder @ 2024-04-06 15:48:12
@[SCma](/user/794146) 你无敌了
by tssys @ 2024-04-06 15:49:21
孩子，你无敌了
by zcz0263 @ 2024-04-06 15:49:39
孩子，你无敌了
by wangbinfeng @ 2024-04-06 15:50:28