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>
using namespace std;
#define int long long
int N;
inline int getvalid(int N) {
int mincur = 0;
int cur = 0;
int mini = 1, maxi = N;
bool parity = false;
while (mini < maxi) {
int mid = (mini+maxi)>>1;
if (!parity) {
cur += mid;
} else {
cur -= mid;
}
mini = mid+1;
parity ^= 1;
mincur = min(mincur, cur);
}
return -mincur;
}
inline bool query(int x) {
cout << "? " << x+1 << '\n' << flush;
bool ret;
cin >> ret;
return ret;
}
signed main() {
//ios::sync_with_stdio(false), cin.tie(0), cout.tie(0);
cin >> N;
int cur = getvalid(N);
int mini = 1, maxi = N;
query(cur);
bool parity = false;
while (mini < maxi) {
int mid = (mini+maxi)>>1;
if (!parity) {
cur += mid;
} else {
cur -= mid;
}
if (query(cur)) {
maxi = mid;
} else {
mini = mid+1;
}
parity ^= 1;
}
cout << "= " << mini << '\n';
}
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