#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#define F first
#define S second
#define pb push_back
#define ppb pop_back
#define ep insert
//#define endl '\n'
#define elif else if
#define pow pwr
#define sqrt sqrtt
#define int long long
#define ll long long
#define y1 YONE
#define free freeee
#define lcm llcm
/*
⠄⠄⠄⠄⢠⣿⣿⣿⣿⣿⢻⣿⣿⣿⣿⣿⣿⣿⣿⣯⢻⣿⣿⣿⣿⣆⠄⠄⠄
⠄⠄⣼⢀⣿⣿⣿⣿⣏⡏⠄⠹⣿⣿⣿⣿⣿⣿⣿⣿⣧⢻⣿⣿⣿⣿⡆⠄⠄
⠄⠄⡟⣼⣿⣿⣿⣿⣿⠄⠄⠄⠈⠻⣿⣿⣿⣿⣿⣿⣿⣇⢻⣿⣿⣿⣿⠄⠄
⠄⢰⠃⣿⣿⠿⣿⣿⣿⠄⠄⠄⠄⠄⠄⠙⠿⣿⣿⣿⣿⣿⠄⢿⣿⣿⣿⡄⠄
⠄⢸⢠⣿⣿⣧⡙⣿⣿⡆⠄⠄⠄⠄⠄⠄⠄⠈⠛⢿⣿⣿⡇⠸⣿⡿⣸⡇⠄
⠄⠈⡆⣿⣿⣿⣿⣦⡙⠳⠄⠄⠄⠄⠄⠄⢀⣠⣤⣀⣈⠙⠃⠄⠿⢇⣿⡇⠄
⠄⠄⡇⢿⣿⣿⣿⣿⡇⠄⠄⠄⠄⠄⣠⣶⣿⣿⣿⣿⣿⣿⣷⣆⡀⣼⣿⡇⠄
⠄⠄⢹⡘⣿⣿⣿⢿⣷⡀⠄⢀⣴⣾⣟⠉⠉⠉⠉⣽⣿⣿⣿⣿⠇⢹⣿⠃⠄
⠄⠄⠄⢷⡘⢿⣿⣎⢻⣷⠰⣿⣿⣿⣿⣦⣀⣀⣴⣿⣿⣿⠟⢫⡾⢸⡟⠄.
⠄⠄⠄⠄⠻⣦⡙⠿⣧⠙⢷⠙⠻⠿⢿⡿⠿⠿⠛⠋⠉⠄⠂⠘⠁⠞⠄⠄⠄
⠄⠄⠄⠄⠄⠈⠙⠑⣠⣤⣴⡖⠄⠿⣋⣉⣉⡁⠄⢾⣦⠄⠄⠄⠄⠄⠄⠄⠄
*/
typedef unsigned long long ull;
using namespace std;
int a[64],n,c=1;
int32_t main(){
ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
cin>>n;;
set<int> s;bool h;
cout<<"? 1"<<endl;cin>>h;
for (int i=2;i<=n;i++) s.ep(i);
int last=1,x;
if (n&1) x=n-1;
else x=n-2;
int y=0;
for (int i=x;i;i-=2){
if (s.count(last+i)){
cout<<"? "<<last+i<<endl;
cin>>h;
last+=i;
}
else{
cout<<"? "<<last-i<<endl;
cin>>h;
last-=i;
}
s.erase(last);
if (!h) {y=i;break;}
}
if (y+1==n){
cout<<"= "<<n<<endl;
return 0;
}
if (last+y+1<=n) cout<<"? "<<last+y+1<<endl,cin>>h;
elif (last-y-1>0) cout<<"? "<<last-y-1<<endl,cin>>h;
else{
for (int i=1;i<=n;i++){
if (!s.count(i)) continue;
if (s.count(i+y+1)){
cout<<"? "<<i<<endl;cin>>h;
cout<<"? "<<i+y+1<<endl;cin>>h;
break;
}
if (s.count(i-y-1)){
cout<<"? "<<i<<endl;cin>>h;
cout<<"? "<<i-y-1<<endl;cin>>h;
break;
}
}
}
if (h) cout<<"= "<<y+1<<endl;
else cout<<"= "<<y+2<<endl;
return 0;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
0 ms |
344 KB |
OK (5 queries) |
2 |
Correct |
1 ms |
456 KB |
OK (5 queries) |
3 |
Correct |
1 ms |
344 KB |
OK (6 queries) |
4 |
Correct |
1 ms |
344 KB |
OK (14 queries) |
5 |
Correct |
0 ms |
344 KB |
OK (9 queries) |
6 |
Correct |
1 ms |
456 KB |
OK (15 queries) |
7 |
Correct |
1 ms |
448 KB |
OK (10 queries) |
8 |
Correct |
0 ms |
344 KB |
OK (6 queries) |
9 |
Correct |
0 ms |
452 KB |
OK (6 queries) |
10 |
Correct |
0 ms |
344 KB |
OK (7 queries) |
11 |
Correct |
1 ms |
344 KB |
OK (4 queries) |
12 |
Correct |
1 ms |
344 KB |
OK (5 queries) |
13 |
Correct |
1 ms |
448 KB |
OK (8 queries) |
14 |
Correct |
0 ms |
448 KB |
OK (10 queries) |
15 |
Correct |
0 ms |
456 KB |
OK (7 queries) |
16 |
Correct |
1 ms |
448 KB |
OK (19 queries) |
17 |
Correct |
0 ms |
344 KB |
OK (2 queries) |
18 |
Correct |
0 ms |
344 KB |
OK (10 queries) |
19 |
Incorrect |
0 ms |
344 KB |
Wrong guess |
20 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
0 ms |
344 KB |
OK (5 queries) |
2 |
Correct |
1 ms |
456 KB |
OK (5 queries) |
3 |
Correct |
1 ms |
344 KB |
OK (6 queries) |
4 |
Correct |
1 ms |
344 KB |
OK (14 queries) |
5 |
Correct |
0 ms |
344 KB |
OK (9 queries) |
6 |
Correct |
1 ms |
456 KB |
OK (15 queries) |
7 |
Correct |
1 ms |
448 KB |
OK (10 queries) |
8 |
Correct |
0 ms |
344 KB |
OK (6 queries) |
9 |
Correct |
0 ms |
452 KB |
OK (6 queries) |
10 |
Correct |
0 ms |
344 KB |
OK (7 queries) |
11 |
Correct |
1 ms |
344 KB |
OK (4 queries) |
12 |
Correct |
1 ms |
344 KB |
OK (5 queries) |
13 |
Correct |
1 ms |
448 KB |
OK (8 queries) |
14 |
Correct |
0 ms |
448 KB |
OK (10 queries) |
15 |
Correct |
0 ms |
456 KB |
OK (7 queries) |
16 |
Correct |
1 ms |
448 KB |
OK (19 queries) |
17 |
Correct |
0 ms |
344 KB |
OK (2 queries) |
18 |
Correct |
0 ms |
344 KB |
OK (10 queries) |
19 |
Incorrect |
0 ms |
344 KB |
Wrong guess |
20 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
0 ms |
344 KB |
OK (5 queries) |
2 |
Correct |
1 ms |
456 KB |
OK (5 queries) |
3 |
Correct |
1 ms |
344 KB |
OK (6 queries) |
4 |
Correct |
1 ms |
344 KB |
OK (14 queries) |
5 |
Correct |
0 ms |
344 KB |
OK (9 queries) |
6 |
Correct |
1 ms |
456 KB |
OK (15 queries) |
7 |
Correct |
1 ms |
448 KB |
OK (10 queries) |
8 |
Correct |
0 ms |
344 KB |
OK (6 queries) |
9 |
Correct |
0 ms |
452 KB |
OK (6 queries) |
10 |
Correct |
0 ms |
344 KB |
OK (7 queries) |
11 |
Correct |
1 ms |
344 KB |
OK (4 queries) |
12 |
Correct |
1 ms |
344 KB |
OK (5 queries) |
13 |
Correct |
1 ms |
448 KB |
OK (8 queries) |
14 |
Correct |
0 ms |
448 KB |
OK (10 queries) |
15 |
Correct |
0 ms |
456 KB |
OK (7 queries) |
16 |
Correct |
1 ms |
448 KB |
OK (19 queries) |
17 |
Correct |
0 ms |
344 KB |
OK (2 queries) |
18 |
Correct |
0 ms |
344 KB |
OK (10 queries) |
19 |
Incorrect |
0 ms |
344 KB |
Wrong guess |
20 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
0 ms |
344 KB |
OK (5 queries) |
2 |
Correct |
1 ms |
456 KB |
OK (5 queries) |
3 |
Correct |
1 ms |
344 KB |
OK (6 queries) |
4 |
Correct |
1 ms |
344 KB |
OK (14 queries) |
5 |
Correct |
0 ms |
344 KB |
OK (9 queries) |
6 |
Correct |
1 ms |
456 KB |
OK (15 queries) |
7 |
Correct |
1 ms |
448 KB |
OK (10 queries) |
8 |
Correct |
0 ms |
344 KB |
OK (6 queries) |
9 |
Correct |
0 ms |
452 KB |
OK (6 queries) |
10 |
Correct |
0 ms |
344 KB |
OK (7 queries) |
11 |
Correct |
1 ms |
344 KB |
OK (4 queries) |
12 |
Correct |
1 ms |
344 KB |
OK (5 queries) |
13 |
Correct |
1 ms |
448 KB |
OK (8 queries) |
14 |
Correct |
0 ms |
448 KB |
OK (10 queries) |
15 |
Correct |
0 ms |
456 KB |
OK (7 queries) |
16 |
Correct |
1 ms |
448 KB |
OK (19 queries) |
17 |
Correct |
0 ms |
344 KB |
OK (2 queries) |
18 |
Correct |
0 ms |
344 KB |
OK (10 queries) |
19 |
Incorrect |
0 ms |
344 KB |
Wrong guess |
20 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
0 ms |
344 KB |
OK (5 queries) |
2 |
Correct |
1 ms |
456 KB |
OK (5 queries) |
3 |
Correct |
1 ms |
344 KB |
OK (6 queries) |
4 |
Correct |
1 ms |
344 KB |
OK (14 queries) |
5 |
Correct |
0 ms |
344 KB |
OK (9 queries) |
6 |
Correct |
1 ms |
456 KB |
OK (15 queries) |
7 |
Correct |
1 ms |
448 KB |
OK (10 queries) |
8 |
Correct |
0 ms |
344 KB |
OK (6 queries) |
9 |
Correct |
0 ms |
452 KB |
OK (6 queries) |
10 |
Correct |
0 ms |
344 KB |
OK (7 queries) |
11 |
Correct |
1 ms |
344 KB |
OK (4 queries) |
12 |
Correct |
1 ms |
344 KB |
OK (5 queries) |
13 |
Correct |
1 ms |
448 KB |
OK (8 queries) |
14 |
Correct |
0 ms |
448 KB |
OK (10 queries) |
15 |
Correct |
0 ms |
456 KB |
OK (7 queries) |
16 |
Correct |
1 ms |
448 KB |
OK (19 queries) |
17 |
Correct |
0 ms |
344 KB |
OK (2 queries) |
18 |
Correct |
0 ms |
344 KB |
OK (10 queries) |
19 |
Incorrect |
0 ms |
344 KB |
Wrong guess |
20 |
Halted |
0 ms |
0 KB |
- |