#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
int query(ll a){
cout<<"? "<<a<<endl;
int b;
cin>>b;
return b;
}
void answer(ll a){
cout<<"= "<<a<<endl;
exit(0);
}
int main(){
int N;
cin>>N;
int ans=query(N/2);
ans=query(1);
if(ans==1){
ans=query(N/2-1);
if(ans==0)answer(N/2-1);
int last=N/2-2;
for(int i=2,j=N/2-2;last>1;i++,j--){
ans=query(i);
if(ans==0)answer(last);
last--;
if(last<=1)break;
ans=query(j);
if(ans==0)answer(last);
last--;
}
answer(1);
}
else{
ans=query(N);
if(ans==0)answer(N);
int last=N-1;
for(int i=2,j=N-1;last>N/2+1;i++,j--){
ans=query(i);
if(ans==0)answer(last);
last--;
if(last<=N/2+1)break;
ans=query(j);
if(ans==0)answer(last);
last--;
}
answer(N/2+1);
}
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
364 KB |
OK (5 queries) |
2 |
Correct |
1 ms |
364 KB |
OK (7 queries) |
3 |
Correct |
1 ms |
364 KB |
OK (5 queries) |
4 |
Correct |
1 ms |
364 KB |
OK (13 queries) |
5 |
Correct |
1 ms |
384 KB |
OK (13 queries) |
6 |
Correct |
1 ms |
364 KB |
OK (27 queries) |
7 |
Correct |
1 ms |
364 KB |
OK (18 queries) |
8 |
Correct |
1 ms |
364 KB |
OK (8 queries) |
9 |
Correct |
1 ms |
364 KB |
OK (10 queries) |
10 |
Correct |
0 ms |
364 KB |
OK (5 queries) |
11 |
Correct |
1 ms |
364 KB |
OK (5 queries) |
12 |
Correct |
1 ms |
364 KB |
OK (6 queries) |
13 |
Correct |
1 ms |
364 KB |
OK (12 queries) |
14 |
Correct |
1 ms |
364 KB |
OK (17 queries) |
15 |
Correct |
1 ms |
364 KB |
OK (12 queries) |
16 |
Correct |
1 ms |
364 KB |
OK (7 queries) |
17 |
Correct |
1 ms |
364 KB |
OK (3 queries) |
18 |
Correct |
1 ms |
256 KB |
OK (17 queries) |
19 |
Correct |
1 ms |
364 KB |
OK (4 queries) |
20 |
Correct |
1 ms |
364 KB |
OK (32 queries) |
21 |
Correct |
1 ms |
364 KB |
OK (10 queries) |
22 |
Incorrect |
1 ms |
364 KB |
Hair color 1 was used multiple times |
23 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
364 KB |
OK (5 queries) |
2 |
Correct |
1 ms |
364 KB |
OK (7 queries) |
3 |
Correct |
1 ms |
364 KB |
OK (5 queries) |
4 |
Correct |
1 ms |
364 KB |
OK (13 queries) |
5 |
Correct |
1 ms |
384 KB |
OK (13 queries) |
6 |
Correct |
1 ms |
364 KB |
OK (27 queries) |
7 |
Correct |
1 ms |
364 KB |
OK (18 queries) |
8 |
Correct |
1 ms |
364 KB |
OK (8 queries) |
9 |
Correct |
1 ms |
364 KB |
OK (10 queries) |
10 |
Correct |
0 ms |
364 KB |
OK (5 queries) |
11 |
Correct |
1 ms |
364 KB |
OK (5 queries) |
12 |
Correct |
1 ms |
364 KB |
OK (6 queries) |
13 |
Correct |
1 ms |
364 KB |
OK (12 queries) |
14 |
Correct |
1 ms |
364 KB |
OK (17 queries) |
15 |
Correct |
1 ms |
364 KB |
OK (12 queries) |
16 |
Correct |
1 ms |
364 KB |
OK (7 queries) |
17 |
Correct |
1 ms |
364 KB |
OK (3 queries) |
18 |
Correct |
1 ms |
256 KB |
OK (17 queries) |
19 |
Correct |
1 ms |
364 KB |
OK (4 queries) |
20 |
Correct |
1 ms |
364 KB |
OK (32 queries) |
21 |
Correct |
1 ms |
364 KB |
OK (10 queries) |
22 |
Incorrect |
1 ms |
364 KB |
Hair color 1 was used multiple times |
23 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
364 KB |
OK (5 queries) |
2 |
Correct |
1 ms |
364 KB |
OK (7 queries) |
3 |
Correct |
1 ms |
364 KB |
OK (5 queries) |
4 |
Correct |
1 ms |
364 KB |
OK (13 queries) |
5 |
Correct |
1 ms |
384 KB |
OK (13 queries) |
6 |
Correct |
1 ms |
364 KB |
OK (27 queries) |
7 |
Correct |
1 ms |
364 KB |
OK (18 queries) |
8 |
Correct |
1 ms |
364 KB |
OK (8 queries) |
9 |
Correct |
1 ms |
364 KB |
OK (10 queries) |
10 |
Correct |
0 ms |
364 KB |
OK (5 queries) |
11 |
Correct |
1 ms |
364 KB |
OK (5 queries) |
12 |
Correct |
1 ms |
364 KB |
OK (6 queries) |
13 |
Correct |
1 ms |
364 KB |
OK (12 queries) |
14 |
Correct |
1 ms |
364 KB |
OK (17 queries) |
15 |
Correct |
1 ms |
364 KB |
OK (12 queries) |
16 |
Correct |
1 ms |
364 KB |
OK (7 queries) |
17 |
Correct |
1 ms |
364 KB |
OK (3 queries) |
18 |
Correct |
1 ms |
256 KB |
OK (17 queries) |
19 |
Correct |
1 ms |
364 KB |
OK (4 queries) |
20 |
Correct |
1 ms |
364 KB |
OK (32 queries) |
21 |
Correct |
1 ms |
364 KB |
OK (10 queries) |
22 |
Incorrect |
1 ms |
364 KB |
Hair color 1 was used multiple times |
23 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
364 KB |
OK (5 queries) |
2 |
Correct |
1 ms |
364 KB |
OK (7 queries) |
3 |
Correct |
1 ms |
364 KB |
OK (5 queries) |
4 |
Correct |
1 ms |
364 KB |
OK (13 queries) |
5 |
Correct |
1 ms |
384 KB |
OK (13 queries) |
6 |
Correct |
1 ms |
364 KB |
OK (27 queries) |
7 |
Correct |
1 ms |
364 KB |
OK (18 queries) |
8 |
Correct |
1 ms |
364 KB |
OK (8 queries) |
9 |
Correct |
1 ms |
364 KB |
OK (10 queries) |
10 |
Correct |
0 ms |
364 KB |
OK (5 queries) |
11 |
Correct |
1 ms |
364 KB |
OK (5 queries) |
12 |
Correct |
1 ms |
364 KB |
OK (6 queries) |
13 |
Correct |
1 ms |
364 KB |
OK (12 queries) |
14 |
Correct |
1 ms |
364 KB |
OK (17 queries) |
15 |
Correct |
1 ms |
364 KB |
OK (12 queries) |
16 |
Correct |
1 ms |
364 KB |
OK (7 queries) |
17 |
Correct |
1 ms |
364 KB |
OK (3 queries) |
18 |
Correct |
1 ms |
256 KB |
OK (17 queries) |
19 |
Correct |
1 ms |
364 KB |
OK (4 queries) |
20 |
Correct |
1 ms |
364 KB |
OK (32 queries) |
21 |
Correct |
1 ms |
364 KB |
OK (10 queries) |
22 |
Incorrect |
1 ms |
364 KB |
Hair color 1 was used multiple times |
23 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
364 KB |
OK (5 queries) |
2 |
Correct |
1 ms |
364 KB |
OK (7 queries) |
3 |
Correct |
1 ms |
364 KB |
OK (5 queries) |
4 |
Correct |
1 ms |
364 KB |
OK (13 queries) |
5 |
Correct |
1 ms |
384 KB |
OK (13 queries) |
6 |
Correct |
1 ms |
364 KB |
OK (27 queries) |
7 |
Correct |
1 ms |
364 KB |
OK (18 queries) |
8 |
Correct |
1 ms |
364 KB |
OK (8 queries) |
9 |
Correct |
1 ms |
364 KB |
OK (10 queries) |
10 |
Correct |
0 ms |
364 KB |
OK (5 queries) |
11 |
Correct |
1 ms |
364 KB |
OK (5 queries) |
12 |
Correct |
1 ms |
364 KB |
OK (6 queries) |
13 |
Correct |
1 ms |
364 KB |
OK (12 queries) |
14 |
Correct |
1 ms |
364 KB |
OK (17 queries) |
15 |
Correct |
1 ms |
364 KB |
OK (12 queries) |
16 |
Correct |
1 ms |
364 KB |
OK (7 queries) |
17 |
Correct |
1 ms |
364 KB |
OK (3 queries) |
18 |
Correct |
1 ms |
256 KB |
OK (17 queries) |
19 |
Correct |
1 ms |
364 KB |
OK (4 queries) |
20 |
Correct |
1 ms |
364 KB |
OK (32 queries) |
21 |
Correct |
1 ms |
364 KB |
OK (10 queries) |
22 |
Incorrect |
1 ms |
364 KB |
Hair color 1 was used multiple times |
23 |
Halted |
0 ms |
0 KB |
- |