#include <bits/stdc++.h>
using namespace std;
#define dbgv(v) cout<<#v<<" = "; f(i,0,v.size()) cout<<v[i]<<" "; cout<<endl
#define dbga(a,x,y) cout<<#a<<" = "; f(i,x,y) cout<<a[i]<<" "; cout<<endl
#define erorp(x) cout<<#x<<"={"<<(x.F)<<" , "<<x.S<<"}"<<endl
#define eror(x) cout<<#x<<'='<<(x)<<endl
#define f_(i,a,b) for(int i=a;i>=b;i--)
#define f(i,a,b) for(int i=a;i<b;i++)
#define nb(x) __builtin_popcount(x)
#define all(v) v.begin(),v.end()
#define bit(n,k) (((n)>>(k))&1)
#define Add(x,y) x=(x+y)%mod
#define maxm(a,b) a=max(a,b)
#define minm(a,b) a=min(a,b)
#define lst(x) x[x.size()-1]
#define sz(x) int(x.size())
#define mp make_pair
#define ll long long
#define pb push_back
#define S second
#define F first
//#include "minerals.h"
const int N=2e5+99;
int n,last,s[N],t[N],L[N],R[N],mark[N];
vector<pair<int,int>> Ans;
vector<int> pos,A,B;
/*
void Answer(int a, int b){
cout<<a<<" edge "<<b<<endl;
}
int Query(int x){
int res=0;
f(i,1,n+1) if(mark[s[i]] || mark[t[i]]) res++;
cout<<"? "<<x<<" "<<res<<endl;
return res;
}*/
bool ask(int x){
mark[x]^=1;
int p=Query(x),res=(p!=last);
last=p;
return res;
}
void reset(){
f(i,1,2*n+1) ask(i);
}
void get(int l,int r){
for(auto x : pos){
if(x<l || r<=x){
ask(B[x]);
}
}
pos.clear();
f(i,l,r){
pos.pb(i);
if(!mark[B[i]]) ask(B[i]);
}
//cout<<"--- "<<l<<" "<<r<<endl;
//f(i,0,n) cout<<mark[i]<<" "; cout<<endl;
}
void solve(int l,int r,vector<int> &vec){
if(l+1==r){
Ans.pb({vec[0],B[l]});
return ;
}
vector<int> a,b;
int mid=(l+r)>>1;
get(l,mid);
for(auto x : vec){
if(ask(x)==0) a.pb(x);
else b.pb(x);
}
solve(l,mid,a);
solve(mid,r,b);
}
void Solve(int N){
n=N;
f(i,1,2*n+1){
if(ask(i)) A.pb(i);
else B.pb(i);
}
f(i,0,n) pos.pb(i);
//dbgv(B);
solve(0,n,A);
for(auto p : Ans){
Answer(p.F,p.S);
}
}
/*
4
1 4
2 5
3 6
7 8
*/
/*
main(){
int n;
cin>>n;
f(i,1,n+1){
cin>>s[i]>>t[i];
}
Solve(n);
}
*/
Compilation message
minerals.cpp: In function 'bool ask(int)':
minerals.cpp:41:8: error: 'Query' was not declared in this scope
41 | int p=Query(x),res=(p!=last);
| ^~~~~
minerals.cpp:43:9: error: 'res' was not declared in this scope
43 | return res;
| ^~~
minerals.cpp: In function 'void Solve(int)':
minerals.cpp:87:3: error: 'Answer' was not declared in this scope
87 | Answer(p.F,p.S);
| ^~~~~~
