没看懂这条
```cpp
bool cmp(city a,city b)
{
return a.x<a.y;
}
```
这是怎么排的，a.x和a.y不分别是南岸和北岸友好城市坐标么
by mobaiawa @ 2023-06-29 17:08:48
草，我和你错一块了
```cpp
struct node{
int a,b;
}a[200010];
bool cmp(node x,node y){
return x.a<y.b;
}
```
```cpp
sort(a+1,a+n+1,cmp);
```
改了对一半（悲
by mobaiawa @ 2023-06-29 17:13:16