// Success consists of going from failure to failure without loss of enthusiasm
#include <bits/stdc++.h>
using namespace std;
#define nl '\n'
template<class T> using V = vector<T>;
using vi = V<int>;
int main() {
cin.tie(0)->sync_with_stdio(0);
int N; cin >> N;
auto ask = [&](int l, int r) {
if (l < 0 || r >= N) return 0;
cout << "? " << l + 1 << " " << r + 1 << endl;
int res; cin >> res; return res;
};
int odd = 0, even = 0;
for(int i = 0; i < N; i++) {
while(ask(i - odd - 1, i + odd + 1)) odd++;
while(ask(i - even, i + even + 1)) even++;
}
cout << "! " << max(2 * odd + 1, 2 * even) << endl;
exit(0-0);
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
61 ms |
344 KB |
Output is correct |
| 2 |
Correct |
63 ms |
596 KB |
Output is correct |
| 3 |
Correct |
58 ms |
344 KB |
Output is correct |
| 4 |
Correct |
61 ms |
344 KB |
Output is correct |
| 5 |
Correct |
72 ms |
344 KB |
Output is correct |
| 6 |
Correct |
64 ms |
344 KB |
Output is correct |
| 7 |
Correct |
59 ms |
344 KB |
Output is correct |
| 8 |
Correct |
58 ms |
344 KB |
Output is correct |
| 9 |
Correct |
69 ms |
344 KB |
Output is correct |
| 10 |
Correct |
61 ms |
344 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
61 ms |
344 KB |
Output is correct |
| 2 |
Correct |
63 ms |
596 KB |
Output is correct |
| 3 |
Correct |
58 ms |
344 KB |
Output is correct |
| 4 |
Correct |
61 ms |
344 KB |
Output is correct |
| 5 |
Correct |
72 ms |
344 KB |
Output is correct |
| 6 |
Correct |
64 ms |
344 KB |
Output is correct |
| 7 |
Correct |
59 ms |
344 KB |
Output is correct |
| 8 |
Correct |
58 ms |
344 KB |
Output is correct |
| 9 |
Correct |
69 ms |
344 KB |
Output is correct |
| 10 |
Correct |
61 ms |
344 KB |
Output is correct |
| 11 |
Correct |
573 ms |
516 KB |
Output is correct |
| 12 |
Correct |
562 ms |
344 KB |
Output is correct |
| 13 |
Correct |
595 ms |
344 KB |
Output is correct |
| 14 |
Correct |
550 ms |
344 KB |
Output is correct |
| 15 |
Correct |
550 ms |
344 KB |
Output is correct |
| 16 |
Correct |
568 ms |
596 KB |
Output is correct |
| 17 |
Correct |
541 ms |
344 KB |
Output is correct |
| 18 |
Correct |
536 ms |
604 KB |
Output is correct |
| 19 |
Correct |
601 ms |
344 KB |
Output is correct |
| 20 |
Correct |
534 ms |
344 KB |
Output is correct |
| 21 |
Correct |
574 ms |
344 KB |
Output is correct |
| 22 |
Correct |
572 ms |
344 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
908 ms |
344 KB |
Output is correct |
| 2 |
Correct |
639 ms |
344 KB |
Output is correct |
| 3 |
Correct |
856 ms |
344 KB |
Output is correct |
| 4 |
Correct |
853 ms |
344 KB |
Output is correct |
| 5 |
Correct |
897 ms |
344 KB |
Output is correct |
| 6 |
Correct |
850 ms |
344 KB |
Output is correct |
| 7 |
Correct |
877 ms |
344 KB |
Output is correct |
| 8 |
Correct |
858 ms |
344 KB |
Output is correct |
| 9 |
Correct |
844 ms |
344 KB |
Output is correct |
| 10 |
Correct |
871 ms |
344 KB |
Output is correct |
| 11 |
Correct |
880 ms |
516 KB |
Output is correct |
| 12 |
Correct |
893 ms |
344 KB |
Output is correct |
| 13 |
Correct |
921 ms |
344 KB |
Output is correct |
| 14 |
Correct |
909 ms |
344 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
61 ms |
344 KB |
Output is correct |
| 2 |
Correct |
63 ms |
596 KB |
Output is correct |
| 3 |
Correct |
58 ms |
344 KB |
Output is correct |
| 4 |
Correct |
61 ms |
344 KB |
Output is correct |
| 5 |
Correct |
72 ms |
344 KB |
Output is correct |
| 6 |
Correct |
64 ms |
344 KB |
Output is correct |
| 7 |
Correct |
59 ms |
344 KB |
Output is correct |
| 8 |
Correct |
58 ms |
344 KB |
Output is correct |
| 9 |
Correct |
69 ms |
344 KB |
Output is correct |
| 10 |
Correct |
61 ms |
344 KB |
Output is correct |
| 11 |
Correct |
573 ms |
516 KB |
Output is correct |
| 12 |
Correct |
562 ms |
344 KB |
Output is correct |
| 13 |
Correct |
595 ms |
344 KB |
Output is correct |
| 14 |
Correct |
550 ms |
344 KB |
Output is correct |
| 15 |
Correct |
550 ms |
344 KB |
Output is correct |
| 16 |
Correct |
568 ms |
596 KB |
Output is correct |
| 17 |
Correct |
541 ms |
344 KB |
Output is correct |
| 18 |
Correct |
536 ms |
604 KB |
Output is correct |
| 19 |
Correct |
601 ms |
344 KB |
Output is correct |
| 20 |
Correct |
534 ms |
344 KB |
Output is correct |
| 21 |
Correct |
574 ms |
344 KB |
Output is correct |
| 22 |
Correct |
572 ms |
344 KB |
Output is correct |
| 23 |
Correct |
908 ms |
344 KB |
Output is correct |
| 24 |
Correct |
639 ms |
344 KB |
Output is correct |
| 25 |
Correct |
856 ms |
344 KB |
Output is correct |
| 26 |
Correct |
853 ms |
344 KB |
Output is correct |
| 27 |
Correct |
897 ms |
344 KB |
Output is correct |
| 28 |
Correct |
850 ms |
344 KB |
Output is correct |
| 29 |
Correct |
877 ms |
344 KB |
Output is correct |
| 30 |
Correct |
858 ms |
344 KB |
Output is correct |
| 31 |
Correct |
844 ms |
344 KB |
Output is correct |
| 32 |
Correct |
871 ms |
344 KB |
Output is correct |
| 33 |
Correct |
880 ms |
516 KB |
Output is correct |
| 34 |
Correct |
893 ms |
344 KB |
Output is correct |
| 35 |
Correct |
921 ms |
344 KB |
Output is correct |
| 36 |
Correct |
909 ms |
344 KB |
Output is correct |
| 37 |
Correct |
855 ms |
344 KB |
Output is correct |
| 38 |
Correct |
897 ms |
344 KB |
Output is correct |
| 39 |
Correct |
895 ms |
344 KB |
Output is correct |
| 40 |
Correct |
902 ms |
344 KB |
Output is correct |
| 41 |
Correct |
865 ms |
344 KB |
Output is correct |
| 42 |
Correct |
875 ms |
344 KB |
Output is correct |
| 43 |
Correct |
868 ms |
344 KB |
Output is correct |
| 44 |
Correct |
879 ms |
344 KB |
Output is correct |
| 45 |
Correct |
898 ms |
344 KB |
Output is correct |
| 46 |
Correct |
920 ms |
344 KB |
Output is correct |
| 47 |
Correct |
907 ms |
344 KB |
Output is correct |
| 48 |
Correct |
930 ms |
344 KB |
Output is correct |
| 49 |
Correct |
853 ms |
344 KB |
Output is correct |
| 50 |
Correct |
875 ms |
344 KB |
Output is correct |
| 51 |
Correct |
857 ms |
344 KB |
Output is correct |
| 52 |
Correct |
905 ms |
344 KB |
Output is correct |
