#include<vector>
std::vector<bool> send_packet(std::vector<bool> A);
void send_message(std::vector<bool> M,std::vector<bool> C){
	M.push_back(true);
	int lm=M.size(),lnow=0;
	#define Mnex (lnow==lm?false:M[lnow++])
	std::vector<int> las(1,0),lat;
	std::vector<bool> tmp(31,false),res,use;
	for(int i=1;i<=30;i++){
		use.clear();use.resize(31,true);
		for(int j:las)
			use[j]=false;
		for(int j=0;j<31;j++)
			if(!C[j])
				if(!use[j])tmp[j]=C[i];
				else tmp[j]=Mnex;
		res.clear();res=send_packet(tmp);
		lat.clear();
		for(int j:las)
			if(res[j])
				lat.push_back(j);
		las.swap(lat);las.push_back(i);
	}
	for(int i=0;i<=30;i++){
		use.clear();use.resize(31,true);
		for(int j:las)
			use[j]=false;
		for(int j=0;j<31;j++)
			if(!C[j])
				if(!use[j])tmp[j]=C[i];
				else tmp[j]=Mnex;
		res.clear();res=send_packet(tmp);
		lat.clear();
		for(int j:las)
			if(res[j])
				lat.push_back(j);
		las.swap(lat);
	}
	for(int i=62;i<=65;i++){
		for(int j=0;j<31;j++)
			if(!C[j])tmp[j]=Mnex;
		send_packet(tmp);
	}
	#undef Mnex
}
std::vector<bool> receive_message(std::vector<std::vector<bool>> R){
	std::vector<int> nex(31,-1),las(1,0),lat;
	std::vector<bool> res,mes;mes.clear();
	std::vector<std::vector<bool>> useful(66,std::vector<bool>(31,true));
	for(int i=1;i<=30;i++){
		for(int j:las)
			useful[i-1][j]=false;
		res.clear();res=R[i-1];
		lat.clear();
		for(int j:las)
			if(res[j])
				lat.push_back(j);
			else
				nex[j]=i;
		las.swap(lat);las.push_back(i);
	}
	for(int i=0;i<=30;i++){
		for(int j:las)
			useful[i+30][j]=false;
		res.clear();res=R[i+30];
		lat.clear();
		for(int j:las)
			if(res[j])
				lat.push_back(j);
			else
				nex[j]=i;
		las.swap(lat);
	}
	for(int i=0;i<31;i++){
		res.clear();res.resize(31,false);
		int now=i;
		while(now!=-1&&!res[now]){
			res[now]=true;
			now=nex[now];
		}
		if(now==i){
			int cnt=0;
			for(int j=0;j<31;j++)
				cnt+=res[j];
			if(cnt==16)
				break;
		}
	}
	for(int i=0;i<66;i++)
		for(int j=0;j<31;j++)
			if(useful[i][j]&&res[j])
				mes.push_back(R[i][j]);
	while(!mes.back())mes.pop_back();
	mes.pop_back();
	return mes;
}

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) {
      |             ^~~