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 <bits/stdc++.h>
#define pb push_back
#define fst first
#define snd second
#define fore(i,a,b) for(ll i=a,isudgh=b;i<isudgh;i++)
#define SZ(x) ((int)(x).size())
#define ALL(x) x.begin(),x.end()
#define mset(a,v) memset((a),(v),sizeof(a))
#define imp(v) {for(auto jhglkdfjg:v)cout<<jhglkdfjg<<" ";cout<<"\n";}
#define FIN ios::sync_with_stdio(0);cin.tie(0);cout.tie(0)
using namespace std;
typedef long long ll;
typedef pair<ll,ll> ii;
set<ll>st;
ll ask(ll c){
assert(!st.count(c));
st.insert(c);
cout<<"? "<<c+1<<endl;
ll ret; cin>>ret;
return ret;
}
int main(){FIN;
ll n; cin>>n;
ask(0);
ll col=0,res=-1;
for(ll i=n-1;i>0;i--){
ll c=col+(i%2==n%2?-i:i);
if(!ask(c)){
res=i+1;
break;
}
col=c;
}
cout<<"= "<<res<<endl;
return 0;
}
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