#include <bits/stdc++.h>
using namespace std;
int Ask(int64_t num){
cout << "? " << num << endl;
int x;
cin >> x;
return x;
}
int32_t main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
int64_t n;
cin >> n;
int64_t l = 1, r = n-1, start = n, cur = 0, dir = 1;
while(l <= r){
int64_t mid = (l + r) >> 1;
cur += dir*mid;
dir *= -1;
start = min(start, n - cur);
l = mid + 1;
}
l = 1, r = n-1, dir = 1;
int64_t answer = n-1;
Ask(start);
while(l <= r){
int64_t mid = (l + r) >> 1;
int64_t ask = start + dir*mid;
dir *= -1;
if(Ask(ask)){
answer = mid;
r = mid - 1;
}
else l = mid + 1;
start = ask;
}
cout << "= " << answer << '\n';
return 0;
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
200 KB |
OK (4 queries) |
| 2 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 3 |
Correct |
1 ms |
200 KB |
OK (4 queries) |
| 4 |
Correct |
1 ms |
200 KB |
OK (5 queries) |
| 5 |
Correct |
1 ms |
200 KB |
OK (5 queries) |
| 6 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 7 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 8 |
Correct |
1 ms |
200 KB |
OK (6 queries) |
| 9 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 10 |
Correct |
1 ms |
200 KB |
OK (4 queries) |
| 11 |
Correct |
1 ms |
200 KB |
OK (5 queries) |
| 12 |
Correct |
1 ms |
200 KB |
OK (6 queries) |
| 13 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 14 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 15 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 16 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 17 |
Incorrect |
1 ms |
200 KB |
Wrong guess |
| 18 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
200 KB |
OK (4 queries) |
| 2 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 3 |
Correct |
1 ms |
200 KB |
OK (4 queries) |
| 4 |
Correct |
1 ms |
200 KB |
OK (5 queries) |
| 5 |
Correct |
1 ms |
200 KB |
OK (5 queries) |
| 6 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 7 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 8 |
Correct |
1 ms |
200 KB |
OK (6 queries) |
| 9 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 10 |
Correct |
1 ms |
200 KB |
OK (4 queries) |
| 11 |
Correct |
1 ms |
200 KB |
OK (5 queries) |
| 12 |
Correct |
1 ms |
200 KB |
OK (6 queries) |
| 13 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 14 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 15 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 16 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 17 |
Incorrect |
1 ms |
200 KB |
Wrong guess |
| 18 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
200 KB |
OK (4 queries) |
| 2 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 3 |
Correct |
1 ms |
200 KB |
OK (4 queries) |
| 4 |
Correct |
1 ms |
200 KB |
OK (5 queries) |
| 5 |
Correct |
1 ms |
200 KB |
OK (5 queries) |
| 6 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 7 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 8 |
Correct |
1 ms |
200 KB |
OK (6 queries) |
| 9 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 10 |
Correct |
1 ms |
200 KB |
OK (4 queries) |
| 11 |
Correct |
1 ms |
200 KB |
OK (5 queries) |
| 12 |
Correct |
1 ms |
200 KB |
OK (6 queries) |
| 13 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 14 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 15 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 16 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 17 |
Incorrect |
1 ms |
200 KB |
Wrong guess |
| 18 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
200 KB |
OK (4 queries) |
| 2 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 3 |
Correct |
1 ms |
200 KB |
OK (4 queries) |
| 4 |
Correct |
1 ms |
200 KB |
OK (5 queries) |
| 5 |
Correct |
1 ms |
200 KB |
OK (5 queries) |
| 6 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 7 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 8 |
Correct |
1 ms |
200 KB |
OK (6 queries) |
| 9 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 10 |
Correct |
1 ms |
200 KB |
OK (4 queries) |
| 11 |
Correct |
1 ms |
200 KB |
OK (5 queries) |
| 12 |
Correct |
1 ms |
200 KB |
OK (6 queries) |
| 13 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 14 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 15 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 16 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 17 |
Incorrect |
1 ms |
200 KB |
Wrong guess |
| 18 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
200 KB |
OK (4 queries) |
| 2 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 3 |
Correct |
1 ms |
200 KB |
OK (4 queries) |
| 4 |
Correct |
1 ms |
200 KB |
OK (5 queries) |
| 5 |
Correct |
1 ms |
200 KB |
OK (5 queries) |
| 6 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 7 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 8 |
Correct |
1 ms |
200 KB |
OK (6 queries) |
| 9 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 10 |
Correct |
1 ms |
200 KB |
OK (4 queries) |
| 11 |
Correct |
1 ms |
200 KB |
OK (5 queries) |
| 12 |
Correct |
1 ms |
200 KB |
OK (6 queries) |
| 13 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 14 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 15 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 16 |
Correct |
1 ms |
200 KB |
OK (7 queries) |
| 17 |
Incorrect |
1 ms |
200 KB |
Wrong guess |
| 18 |
Halted |
0 ms |
0 KB |
- |
