#include<bits/stdc++.h>
using namespace std;
struct node{
int x,y;
bool operator <(const node &temp)const{
if(x<temp.x)return true;
return false;
}
};
int main()
{
map<node,int>Map;
node temp;
temp.x=1,temp.y=1;
Map[temp]=1;
cout<<Map[temp]<<endl;
temp.x=2;
cout<<Map[temp]<<endl;
return 0;
输出:1
:0
}