이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <cassert>
#include <iostream>
#include <map>
#include <set>
#include <vector>
#define ll long long
#define ln "\n"
#define ff first
#define ss second
#define ull unsigned ll
#define ld long double
const ll INF = 1e9;
const ll MOD = 1e9+7;
using namespace std;
void solve(){
ll n; cin >> n;
map<ll, bool> usd;
ll l=0, r=n;
vector<ll> moves;
while (l+1<r) moves.push_back((r+l)/2), l=(r+l)/2;
ll sp=1;
for (ll i=moves.size()-1; i>=0; i--){
if (sp+moves[i]<=n) sp+=moves[i];
else sp-=moves[i];
}
usd[sp]=1;
cout << "? " << sp << endl; ll _; cin >> _;
l=0, r=n; ll lp=sp;
while (l+1<r){
ll mid = (l+r)/2;
if (lp+mid<=n and !usd[lp+mid]){
lp=lp+mid;
cout << "? " << lp << endl;
}else{
lp=lp-mid;
cout << "? " << lp << endl;
}
usd[lp]=1;
ll x; cin >> x;
if (x) r=mid;
else l=mid;
}
cout << "= " << r << endl;
}
// 123456789
// #.####.#.
void setIO(){
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
cout.tie(nullptr);
}
int main(){
setIO();
ll t=1;
// cin >> t;
while (t--) solve();
}
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