This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include "interactive.h"
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll,ll> pi;
typedef vector<int> vi;
typedef vector<pi> vpi;
#define pb emplace_back
#define mp make_pair
#define f first
#define s second
#define SZ(x) (int)x.size()
#define ALL(x) x.begin(),x.end()
#define lb lower_bound
const int MAXN=1001000;
const ll MOD=998244353;
set<int> V[10];
int N;
set<int> query(vi A){
if(SZ(A) == 0){
set<int> K;
return K;
}
vi a = get_pairwise_xor(A);
A.pb(N);
vi b = get_pairwise_xor(A);
multiset<int> M;
for(auto i:b)M.insert(i);
for(auto i:a)M.erase(M.find(i));
A.pop_back();
set<int> T;
for(auto i:M)T.insert(i);
T.erase(0);
assert(SZ(T) == SZ(A));
return T;
}
vector<int> guess(int n) {
N=n;
int lst=ask(n);
// cerr<<lst<<'\n';
vi T;
for(int i=1;i<n;++i)T.pb(i);
set<int> X = query(T);
// for(auto i:X)cerr<<(i^lst)<<' ';cerr<<'\n';
for(int i=0;i<7;++i){
vi X;
for(int w=1;w<N;++w){
if(w & (1<<i))X.pb(w);
}
if(!SZ(X))continue;
V[i] = query(X);
// for(auto i:X)cerr<<i<<' ';cerr<<'\n';
// for(auto i:K)cerr<<i<<' ';cerr<<'\n';
// cerr<<'\n';
}
vector <int> ans;
for(int i=1;i<N;++i){
for(auto curv:X){
int fail = 0;
for(int k=0;k<7;++k){
int a = (V[k].find(curv) != V[k].end());
int b = ((1<<k) & i) > 0;
if(a!=b)fail=1;
}
if(fail)continue;
ans.pb(curv^lst);
// cout<<(curv^lst)<<'\n';
// cerr<<i<<' '<<curv<<' '<<fail<<'\n';
}
}
ans.pb(lst);
return ans;
}
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