第一个 hack 这一篇，cmd的gen

https://www.luogu.com.cn/blog/dsidsi/solution-p4183

#include<algorithm>
#include<cstdio>
#define pf printf
using namespace std;
int n;
int main()
{
  freopen("a.txt","w",stdout);
  n=23333*3+1;
  pf("%d\n",n);
  for (int i=2;i<n;i+=3){
    pf("1 %d\n",i);
    pf("%d %d\n",i,i+1);
    pf("%d %d\n",i,i+2);
  }return 0;
}

第二个我自己的gen，hack了第一篇题解。

https://www.luogu.com.cn/blog/efforts-will-pay-off/solution-p4183

#include <bits/stdc++.h>
int main() {
	freopen("1.in", "w", stdout);
	int n = 7e4;
	printf("%d\n", n);
	for (int i = 1; i < n; ++i) {
		printf("%d %d\n", i, i + 1);
	}
	return 0;
}