#include<bits/stdc++.h>
#include "message.h"
using namespace std;
mt19937 rnd(114514);

#define pb emplace_back
void send_message(vector<bool> Ans,vector<bool> C){
	int s1=0,s2=0;
	for(int i=0;i<31;++i)s1|=C[i]<<i;
	while(s1!=s2){
		int x=rnd();
		vector<bool>arr(31,0);
		for(int j=0;j<31;j++)arr[j]=x>>j&1;
		vector<bool>tmp=send_packet(arr);
		for(int j=0;j<31;j++)
			if(tmp[j]!=(x>>j&1))s2|=1<<j;
	}
	Ans.push_back(1);
	while(Ans.size()<1025)Ans.pb(0);
	int S=Ans.size(),now=0;
	for(int i=1;i<=65;i++){
		vector<bool>arr(31,0);
		for(int j=0;j<C.size();++j)
			if(!C[j]&&now<S)arr[j]=M[now++];
		send_packet(arr);
	}
}
vector<bool> receive_message(vector<vector<bool> > R){
	int s=0;
	for(int i=0;i<R.size()-64;i++){
		int x=rnd();
		for(int j=0;j<31;j++)
			if(R[i][j]!=((x>>j)&1))s|=1<<j;
	}
	vector<bool>Ans;
	for(int i=R.size()-64;i<R.size();i++)
		for(int j=0;j<31;j++)
			if(!((s>>j)&1))Ans.pb(R[i][j]);
	while(!Ans.back())Ans.pop_back();
	Ans.pop_back();
	return Ans;
}

answer.code: In function ‘void send_message(std::vector<bool>, std::vector<bool>)’:
answer.code:24:48: error: ‘M’ was not declared in this scope
   24 |                         if(!C[j]&&now<S)arr[j]=M[now++];
      |                                                ^