struct node
{
ll a, b;
bool operator< (const node &c)const{
return a < c.a;
}
}pre[eps];
struct node
{
ll a, b;
bool operator< (const node &c)const{
return a < c.a;
}
}pre[eps];
原文：http://www.cnblogs.com/ccut-ry/p/8027282.html