QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#106126 | #6394. Turn on the Light | bigdinnerafterac# | WA | 2ms | 3416kb | C++11 | 540b | 2023-05-16 18:03:46 | 2023-05-16 18:03:50 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
int query(int x) {
int res;
cout << "? " << x << endl;
cout.flush();
cin >> res;
return res;
}
int main() {
int n;
cin >> n;
int l = 1, r = n;
int d1 = query(1);
while (l < r) {
int m = (l + r) / 2;
int d2 = query(m);
int d = d1 - d2;
if (d == 0) {
cout << "! " << m << endl;
break;
}
if (d > 0) {
r = m - 1;
} else {
l = m + 1;
d1 = d2;
}
}
if (l == r) {
cout << "! " << l << endl;
}
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 0ms
memory: 3416kb
input:
3 1 2
output:
? 1 ? 2 ! 3
result:
ok Correct position at 3
Test #2:
score: 0
Accepted
time: 2ms
memory: 3296kb
input:
10 1 2 3 3
output:
? 1 ? 5 ? 8 ? 9 ! 9
result:
ok Correct position at 9
Test #3:
score: 0
Accepted
time: 2ms
memory: 3304kb
input:
9 1 2 3 3
output:
? 1 ? 5 ? 7 ? 8 ! 8
result:
ok Correct position at 8
Test #4:
score: 0
Accepted
time: 1ms
memory: 3356kb
input:
8 1 2 3 3
output:
? 1 ? 4 ? 6 ? 7 ! 7
result:
ok Correct position at 7
Test #5:
score: 0
Accepted
time: 2ms
memory: 3240kb
input:
7 1 2 3
output:
? 1 ? 4 ? 6 ! 7
result:
ok Correct position at 7
Test #6:
score: 0
Accepted
time: 0ms
memory: 3360kb
input:
6 1 2 3
output:
? 1 ? 3 ? 5 ! 6
result:
ok Correct position at 6
Test #7:
score: 0
Accepted
time: 2ms
memory: 3300kb
input:
5 1 2 3
output:
? 1 ? 3 ? 4 ! 5
result:
ok Correct position at 5
Test #8:
score: 0
Accepted
time: 0ms
memory: 3392kb
input:
4 1 2 3
output:
? 1 ? 2 ? 3 ! 4
result:
ok Correct position at 4
Test #9:
score: 0
Accepted
time: 0ms
memory: 3364kb
input:
3 1 1
output:
? 1 ? 2 ! 2
result:
ok Correct position at 2
Test #10:
score: -100
Wrong Answer
time: 2ms
memory: 3396kb
input:
2 1 1
output:
? 1 ? 1 ! 1
result:
wrong answer Wrong favorite light!