```cpp
for(int i=1;i<=n-1;i++){
cin>>ap[i].xi>>ap[i].yi;
}
```
为什么是n - 1
by zrz_orz @ 2019-08-30 11:31:35
```cpp
for(int i=1;i<=n-1;i++){
cin>>ap[i].xi>>ap[i].yi;
}
```
n-1哪来的
@[柠檬茶](/space/show?uid=152900)
by royzhu @ 2019-08-30 11:33:24
谢谢
by Lemon_tea @ 2019-08-30 12:53:53