https://blog.csdn.net/a_forever_dream/article/details/88867801
// struct构造函数,说白了,就是初始化
// 下面这段代码,看起来很奇怪,可是一定要很熟悉的啊
#include <bits/stdc++.h>
using namespace std;
struct node{
int x, y;
node(int _x = 0, int _y = 0): x(_x), y(_y){}
};
int main(){
node(2, 3);
return 0;
}