提供一个数据生成器

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const int N = 1e6 + 5;
int n, a[N];
ll Rand(ll l,ll r){
	return 1ll * rand() * rand() % (r - l + 1) + l;
} 
int main(){
	freopen("interval.in", "w", stdout);
	srand(time(0));
	n = Rand(5e5 - 10, 5e5);
	cout << n * 2 - 1 << '\n';
	for(int i = 1, j = n - 1; i <= n * 2 - 1; --j, i += 2)
		a[i] = j;
	for(int i = 2, j = n; i < n * 2; --j, i += 2)
		a[i] = j;
	a[n * 2 - 1] = 1;
	for(int i = 1; i <= n * 2 - 1; ++i)
		cout << a[i] << ' ';
	cout << '\n';
	for(int i = 1; i <= n * 2 - 1; ++i)
		cout << 1 << ' ';
	cout << '\n';
	for(int i = 1; i <= n * 2 - 1; ++i)
		cout << 1 << ' ';
	return 0;
}