#include <bits/stdc++.h>
using namespace std;
const int nx=1005;
int n, tmp, l, r, t, lst, x, ql[nx], qr[nx], used[nx];
int query(int x)
{
cout<<"? "<<x<<endl;
cin>>tmp;
return tmp;
}
int main()
{
cin>>n;
if (n==1) return cout<<"= "<<1, 0;
for (int i=1; i<n; i++) ql[i]=1+(n-i)/2, qr[i]=n-((n-i)-1)/2; //cout<<"debug "<<i<<' '<<ql[i]<<' '<<qr[i]<<'\n';
l=r=n;
for (int i=63; ; i--)
{
l=max(1, r-i);
if (l==r) return cout<<"= "<<l, 0;
if (ql[l]==ql[l+1]) lst=ql[l], query(qr[l]), t=query(ql[l]), used[qr[l]]=used[ql[l]]=1;
else lst=qr[l], query(ql[l]), t=query(qr[l]), used[qr[l]]=used[ql[l]]=1;
if (t)
{
r=l;
continue;
}
else
{
for (int j=l+1; j<r; j++)
{
if ((lst!=ql[j]&&used[ql[j]])||(lst!=qr[j]&&used[qr[j]]))
{
l=j;
break;
}
if (lst==ql[j])
{
lst=qr[j];
t=query(qr[j]);
}
else
{
lst=ql[j];
t=query(ql[j]);
}
if (t) return cout<<"= "<<j, 0;
if (j==r-1) return cout<<"= "<<r, 0;
}
if (l==r) return cout<<"= "<<l, 0;
for (int j=1; j+l<=n; j++)
{
if (!used[j]&&!used[j+l])
{
query(j);
t=query(j+l);
if (t) return cout<<"= "<<l<<'\n', 0;
else return cout<<"= "<<r<<'\n', 0;
}
}
}
}
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
0 ms |
344 KB |
OK (5 queries) |
| 2 |
Correct |
0 ms |
344 KB |
OK (46 queries) |
| 3 |
Correct |
0 ms |
344 KB |
OK (3 queries) |
| 4 |
Correct |
1 ms |
344 KB |
OK (2 queries) |
| 5 |
Correct |
0 ms |
344 KB |
OK (13 queries) |
| 6 |
Correct |
0 ms |
344 KB |
OK (33 queries) |
| 7 |
Correct |
1 ms |
344 KB |
OK (38 queries) |
| 8 |
Correct |
0 ms |
344 KB |
OK (39 queries) |
| 9 |
Correct |
1 ms |
344 KB |
OK (40 queries) |
| 10 |
Correct |
0 ms |
344 KB |
OK (2 queries) |
| 11 |
Correct |
0 ms |
344 KB |
OK (13 queries) |
| 12 |
Correct |
0 ms |
344 KB |
OK (21 queries) |
| 13 |
Correct |
0 ms |
344 KB |
OK (39 queries) |
| 14 |
Correct |
1 ms |
344 KB |
OK (31 queries) |
| 15 |
Correct |
1 ms |
380 KB |
OK (46 queries) |
| 16 |
Correct |
1 ms |
344 KB |
OK (22 queries) |
| 17 |
Correct |
1 ms |
344 KB |
OK (35 queries) |
| 18 |
Correct |
1 ms |
344 KB |
OK (24 queries) |
| 19 |
Correct |
0 ms |
344 KB |
OK (26 queries) |
| 20 |
Correct |
1 ms |
344 KB |
OK (36 queries) |
| 21 |
Correct |
1 ms |
344 KB |
OK (51 queries) |
| 22 |
Incorrect |
1 ms |
344 KB |
Query limit exceeded |
| 23 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
0 ms |
344 KB |
OK (5 queries) |
| 2 |
Correct |
0 ms |
344 KB |
OK (46 queries) |
| 3 |
Correct |
0 ms |
344 KB |
OK (3 queries) |
| 4 |
Correct |
1 ms |
344 KB |
OK (2 queries) |
| 5 |
Correct |
0 ms |
344 KB |
OK (13 queries) |
| 6 |
Correct |
0 ms |
344 KB |
OK (33 queries) |
| 7 |
Correct |
1 ms |
344 KB |
OK (38 queries) |
| 8 |
Correct |
0 ms |
344 KB |
OK (39 queries) |
| 9 |
Correct |
1 ms |
344 KB |
OK (40 queries) |
| 10 |
Correct |
0 ms |
344 KB |
OK (2 queries) |
| 11 |
Correct |
0 ms |
344 KB |
OK (13 queries) |
| 12 |
Correct |
0 ms |
344 KB |
OK (21 queries) |
| 13 |
Correct |
0 ms |
344 KB |
OK (39 queries) |
| 14 |
Correct |
1 ms |
344 KB |
OK (31 queries) |
| 15 |
Correct |
1 ms |
380 KB |
OK (46 queries) |
| 16 |
Correct |
1 ms |
344 KB |
OK (22 queries) |
| 17 |
Correct |
1 ms |
344 KB |
OK (35 queries) |
| 18 |
Correct |
1 ms |
344 KB |
OK (24 queries) |
| 19 |
Correct |
0 ms |
344 KB |
OK (26 queries) |
| 20 |
Correct |
1 ms |
344 KB |
OK (36 queries) |
| 21 |
Correct |
1 ms |
344 KB |
OK (51 queries) |
| 22 |
Incorrect |
1 ms |
344 KB |
Query limit exceeded |
| 23 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
0 ms |
344 KB |
OK (5 queries) |
| 2 |
Correct |
0 ms |
344 KB |
OK (46 queries) |
| 3 |
Correct |
0 ms |
344 KB |
OK (3 queries) |
| 4 |
Correct |
1 ms |
344 KB |
OK (2 queries) |
| 5 |
Correct |
0 ms |
344 KB |
OK (13 queries) |
| 6 |
Correct |
0 ms |
344 KB |
OK (33 queries) |
| 7 |
Correct |
1 ms |
344 KB |
OK (38 queries) |
| 8 |
Correct |
0 ms |
344 KB |
OK (39 queries) |
| 9 |
Correct |
1 ms |
344 KB |
OK (40 queries) |
| 10 |
Correct |
0 ms |
344 KB |
OK (2 queries) |
| 11 |
Correct |
0 ms |
344 KB |
OK (13 queries) |
| 12 |
Correct |
0 ms |
344 KB |
OK (21 queries) |
| 13 |
Correct |
0 ms |
344 KB |
OK (39 queries) |
| 14 |
Correct |
1 ms |
344 KB |
OK (31 queries) |
| 15 |
Correct |
1 ms |
380 KB |
OK (46 queries) |
| 16 |
Correct |
1 ms |
344 KB |
OK (22 queries) |
| 17 |
Correct |
1 ms |
344 KB |
OK (35 queries) |
| 18 |
Correct |
1 ms |
344 KB |
OK (24 queries) |
| 19 |
Correct |
0 ms |
344 KB |
OK (26 queries) |
| 20 |
Correct |
1 ms |
344 KB |
OK (36 queries) |
| 21 |
Correct |
1 ms |
344 KB |
OK (51 queries) |
| 22 |
Incorrect |
1 ms |
344 KB |
Query limit exceeded |
| 23 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
0 ms |
344 KB |
OK (5 queries) |
| 2 |
Correct |
0 ms |
344 KB |
OK (46 queries) |
| 3 |
Correct |
0 ms |
344 KB |
OK (3 queries) |
| 4 |
Correct |
1 ms |
344 KB |
OK (2 queries) |
| 5 |
Correct |
0 ms |
344 KB |
OK (13 queries) |
| 6 |
Correct |
0 ms |
344 KB |
OK (33 queries) |
| 7 |
Correct |
1 ms |
344 KB |
OK (38 queries) |
| 8 |
Correct |
0 ms |
344 KB |
OK (39 queries) |
| 9 |
Correct |
1 ms |
344 KB |
OK (40 queries) |
| 10 |
Correct |
0 ms |
344 KB |
OK (2 queries) |
| 11 |
Correct |
0 ms |
344 KB |
OK (13 queries) |
| 12 |
Correct |
0 ms |
344 KB |
OK (21 queries) |
| 13 |
Correct |
0 ms |
344 KB |
OK (39 queries) |
| 14 |
Correct |
1 ms |
344 KB |
OK (31 queries) |
| 15 |
Correct |
1 ms |
380 KB |
OK (46 queries) |
| 16 |
Correct |
1 ms |
344 KB |
OK (22 queries) |
| 17 |
Correct |
1 ms |
344 KB |
OK (35 queries) |
| 18 |
Correct |
1 ms |
344 KB |
OK (24 queries) |
| 19 |
Correct |
0 ms |
344 KB |
OK (26 queries) |
| 20 |
Correct |
1 ms |
344 KB |
OK (36 queries) |
| 21 |
Correct |
1 ms |
344 KB |
OK (51 queries) |
| 22 |
Incorrect |
1 ms |
344 KB |
Query limit exceeded |
| 23 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
0 ms |
344 KB |
OK (5 queries) |
| 2 |
Correct |
0 ms |
344 KB |
OK (46 queries) |
| 3 |
Correct |
0 ms |
344 KB |
OK (3 queries) |
| 4 |
Correct |
1 ms |
344 KB |
OK (2 queries) |
| 5 |
Correct |
0 ms |
344 KB |
OK (13 queries) |
| 6 |
Correct |
0 ms |
344 KB |
OK (33 queries) |
| 7 |
Correct |
1 ms |
344 KB |
OK (38 queries) |
| 8 |
Correct |
0 ms |
344 KB |
OK (39 queries) |
| 9 |
Correct |
1 ms |
344 KB |
OK (40 queries) |
| 10 |
Correct |
0 ms |
344 KB |
OK (2 queries) |
| 11 |
Correct |
0 ms |
344 KB |
OK (13 queries) |
| 12 |
Correct |
0 ms |
344 KB |
OK (21 queries) |
| 13 |
Correct |
0 ms |
344 KB |
OK (39 queries) |
| 14 |
Correct |
1 ms |
344 KB |
OK (31 queries) |
| 15 |
Correct |
1 ms |
380 KB |
OK (46 queries) |
| 16 |
Correct |
1 ms |
344 KB |
OK (22 queries) |
| 17 |
Correct |
1 ms |
344 KB |
OK (35 queries) |
| 18 |
Correct |
1 ms |
344 KB |
OK (24 queries) |
| 19 |
Correct |
0 ms |
344 KB |
OK (26 queries) |
| 20 |
Correct |
1 ms |
344 KB |
OK (36 queries) |
| 21 |
Correct |
1 ms |
344 KB |
OK (51 queries) |
| 22 |
Incorrect |
1 ms |
344 KB |
Query limit exceeded |
| 23 |
Halted |
0 ms |
0 KB |
- |
