对不起，发错了。
by Pethly_Cat @ 2019-03-24 11:57:32
题号是[P1478](https://www.luogu.org/problemnew/show/P1478)
by Pethly_Cat @ 2019-03-24 12:05:39
这明显不对啊，应该开结构体再Bool cmp
sort(arr,arr+n,cmp)
by Stay_Hungry @ 2019-03-24 12:13:15
@[huangzimeng](/space/show?uid=134066)
```cpp
struct node{
int x , y;
}arr[ Maxn ];
bool cmp( node a , node b ){
return a.y < b.y;
}
int main( void ){
int n; cin >> n;
for( register int i = 0;i < n;++i )
cin >> arr[i].x >> arr[i].y;
sort( arr , arr+n , cmp );
for( register int i = 0;i < n;++i){
……………………………………
}
}
```
by Stay_Hungry @ 2019-03-24 12:17:12
@[Destroy_create](https://www.luogu.org/space/show?uid=105922)谢谢
by Pethly_Cat @ 2019-03-24 16:11:29