#include<bits/stdc++.h>
#include "message.h"
using namespace std;
#define N 1000010
#define int long long
#define db long double
#define pii pair<int,int>
#define st first
#define ed second
#define mkp make_pair
#define pb push_back
#define eps 1e-9
#define mod 998244353
#define mod2 1000000007
#define bs 13131
#define bs2 131
#define INF 0x3f3f3f3f3f3f3f3f
#define il inline
#define vi vector<int>
#define ins insert
#define umap unordered_map
#define uset unordered_set
#define R(x) x.begin(),x.end()
#define B(x) x.begin()
#define E(x) x.end()
#define lb lower_bound
#define ub upper_bound
il int read(){
	int x=0,f=1;
	char ch=getchar();
	while(ch<'0'||ch>'9'){
		if(ch=='-')f=-1;
		ch=getchar();
	}
	while(ch>='0'&&ch<='9'){
		x=(x<<1)+(x<<3)+(ch^48);
		ch=getchar();
	}
	return x*f;
}
void send_message(std::vector<bool> M, std::vector<bool> C){
	M.pb(1),M.resize(1025,0);
	vector<int> p;
	vector<int> d(16);
	for(int i=0;i<31;i++)if(!C[i])p.pb(i);
	for(int i=0;i<16;i++)d[i]=(p[(i+1)%16]-p[i]+31)%31;
	vector<vector<bool>> data(66,vector<bool>(31,0));
	int pos=0;
	for(int i=0;i<16;i++){
		for(int j=0;j<d[i]-1;j++)data[p[i]][j]=0;
		data[p[i]][d[i]-1]=1;
		for(int j=d[i];j<66;j++)data[j][p[i]]=M[pos++];
	}
	for(int i=0;i<66;i++)send_packet(data[i]);
}
std::vector<bool> receive_message(std::vector<std::vector<bool>> R){
	vector<int> to(31,0),vis(31,0);
	for(int i=0;i<31;i++)
		for(int j=0;j<66;j++)
			if(R[j][i]){
				to[i]=(i+j+j)%31;
				break;
			}
	vector<int> p,tmp;
	for(int i=0;i<31;i++){
		if(vis[i])continue;
		tmp.clear();
		int now=i;
		do{tmp.pb(now),now=to[now],vis[now]=1;}while(now!=i);
		if(tmp.size()==16){
			p=tmp;
			break;
		}
	}
	vector<bool> ans;
	for(auto x:p)
		for(int i=0;i<66;i++)
			if(R[i][x]){
				for(int j=i+1;j<66;j++)
					ans.pb(R[j][x]);
				break;
			}
	while(!ans.back())ans.pop_back();
	ans.pop_back();
	return ans;
}

stub.cpp: In function ‘int {anonymous}::sz(const C&)’:
stub.cpp:27:52: error: ‘size’ is not a member of ‘std’; did you mean ‘size_t’?
   27 | template<class C> int sz(const C& c) { return std::size(c); }
      |                                                    ^~~~
      |                                                    size_t
stub.cpp: In function ‘void {anonymous}::write_int_array(const int*, int)’:
stub.cpp:70:13: warning: init-statement in selection statements only available with ‘-std=c++17’ or ‘-std=gnu++17’
   70 |         if (int ret = fwrite(arr, sizeof(int), len, fout); len != ret) {
      |             ^~~
stub.cpp: In function ‘void {anonymous}::read_int_array(int*, int)’:
stub.cpp:105:13: warning: init-statement in selection statements only available with ‘-std=c++17’ or ‘-std=gnu++17’
  105 |         if (int ret = fread(arr, sizeof(int), len, fin); len != ret) {
      |             ^~~