关于operator

struct node
{
	int cc,id;//how long,cost
	friend bool operator<(const node &x,const node &y)
	{
		return x.cc>y.cc;
	}
};

struct node
{
	int cc,id;//how long,cost
	friend bool operator<(node x,node y)
	{
		return x.cc>y.cc;
	}
};