QOJ.ac
QOJ
| ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
|---|---|---|---|---|---|---|---|---|---|
| #383576 | #6394. Turn on the Light | innovation | WA | 1ms | 3692kb | C++14 | 621b | 2024-04-09 15:35:25 | 2024-04-09 15:35:25 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
ll query(ll x)
{
cout<<"? "<<x<<endl;
cin>>x;
return x;
}
int main()
{
ll n, ans, L, R, mid;
cin>>n;
ans = 0;
for(ll i=1;i<=20&&i<=n;++i)
{
auto t = query(i);
if(t==ans)
{
cout<<"! "<<i<<endl;
return 0;
}
ans = t;
}
L = min((ll)21, n+1);
R = n;
while(L<=R)
{
mid = L+R>>1;
auto t = query(mid);
if(t==ans)
{
cout<<"! "<<mid<<endl;
return 0;
}
else if(t>ans)
{//如果更大. 则在右侧
L = mid+1;
}
else if(t<ans)
{
R = mid-1;
}
}
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 1ms
memory: 3580kb
input:
3 1 2 2
output:
? 1 ? 2 ? 3 ! 3
result:
ok Correct position at 3
Test #2:
score: 0
Accepted
time: 1ms
memory: 3556kb
input:
10 1 2 3 4 5 6 7 8 8
output:
? 1 ? 2 ? 3 ? 4 ? 5 ? 6 ? 7 ? 8 ? 9 ! 9
result:
ok Correct position at 9
Test #3:
score: 0
Accepted
time: 0ms
memory: 3580kb
input:
9 1 2 3 4 5 6 7 7
output:
? 1 ? 2 ? 3 ? 4 ? 5 ? 6 ? 7 ? 8 ! 8
result:
ok Correct position at 8
Test #4:
score: 0
Accepted
time: 1ms
memory: 3676kb
input:
8 1 2 3 4 5 6 6
output:
? 1 ? 2 ? 3 ? 4 ? 5 ? 6 ? 7 ! 7
result:
ok Correct position at 7
Test #5:
score: 0
Accepted
time: 1ms
memory: 3580kb
input:
7 1 2 3 4 5 5
output:
? 1 ? 2 ? 3 ? 4 ? 5 ? 6 ! 6
result:
ok Correct position at 6
Test #6:
score: 0
Accepted
time: 1ms
memory: 3692kb
input:
6 1 2 3 4 5 5
output:
? 1 ? 2 ? 3 ? 4 ? 5 ? 6 ! 6
result:
ok Correct position at 6
Test #7:
score: 0
Accepted
time: 0ms
memory: 3548kb
input:
5 1 2 3 3
output:
? 1 ? 2 ? 3 ? 4 ! 4
result:
ok Correct position at 4
Test #8:
score: 0
Accepted
time: 0ms
memory: 3564kb
input:
4 1 2 3 3
output:
? 1 ? 2 ? 3 ? 4 ! 4
result:
ok Correct position at 4
Test #9:
score: 0
Accepted
time: 1ms
memory: 3672kb
input:
3 1 1
output:
? 1 ? 2 ! 2
result:
ok Correct position at 2
Test #10:
score: 0
Accepted
time: 1ms
memory: 3564kb
input:
2 1 1
output:
? 1 ? 2 ! 2
result:
ok Correct position at 2
Test #11:
score: 0
Accepted
time: 1ms
memory: 3672kb
input:
1 0
output:
? 1 ! 1
result:
ok Correct position at 1
Test #12:
score: -100
Wrong Answer
time: 1ms
memory: 3564kb
input:
1000000 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 22 21 20
output:
? 1 ? 2 ? 3 ? 4 ? 5 ? 6 ? 7 ? 8 ? 9 ? 10 ? 11 ? 12 ? 13 ? 14 ? 15 ? 16 ? 17 ? 18 ? 19 ? 20 ? 500010 ? 750005 ? 875003 ? 937502 ? 968751 ? 984376 ! 984376
result:
wrong answer Wrong answer, more than 1 possible light!