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ID题目提交者结果用时内存语言文件大小提交时间测评时间
#681200#8939. PermutationRico64WA 4ms3708kbC++231012b2024-10-27 02:43:162024-10-27 02:43:17

Judging History

This is the latest submission verdict.

  • [2024-10-27 02:43:17]
  • Judged
  • Verdict: WA
  • Time: 4ms
  • Memory: 3708kb
Show
  • [2024-10-27 02:43:16]
  • Submitted

answer

#include <iostream>

using namespace std;

int query(int l, int r) {
    if (r - l <= 1) return -2;
    cout << "? " << l + 1 << ' ' << r << endl;
    cout.flush();
    int re;
    cin >> re;
    return re - 1;
}

void submit(int i) {
    cout << "! " << i + 1 << endl;
    cout.flush();
}

void solve() {
    int n;
    cin >> n;
    int l = 0, r = n, n1 = -1;
    while (l < r) {
        if (n1 < 0) {
            n1 = query(l, r);
        }
        int m = (l + r) / 2;
        if (n1 >= m) {
            int q = query(m, r);
            if (q == n1) {
                l = m;
            } else {
                r = m;
                n1 = -1;
            }
        } else {
            int q = query(l, m);
            if (q == n1) {
                r = m;
            } else {
                l = m;
                n1 = -1;
            }
        }
    }
    submit(l);
}

int main() {
    int t;
    cin >> t;
    while (t--) solve();

    return 0;
}
源文件, 语言: C++23

詳細信息

Test #1:

score: 100
Accepted
time: 1ms
memory: 3688kb

input:

3
5
3
3
5
6
6
5
3
3
4
3
3

output:

? 1 5
? 3 5
? 4 5
! 4
? 1 6
? 4 6
? 1 3
? 2 3
! 2
? 1 4
? 3 4
! 4

result:

ok Correct (3 test cases)

Test #2:

score: -100
Wrong Answer
time: 4ms
memory: 3708kb

input:

10000
10
2
2
1
3
5
10
10
10
8
7
10
5
1
10
9
6
10
4
4
4
5
10
10
6
3
5
2
10
3
3
5
2
10
1
5
9
9
10
10
1
3
8
10
6
10
2
4
9
9
9
10
3
3
3
5
10
4
1
7
6
8

output:

? 1 10
? 1 5
? 1 2
? 3 5
? 4 5
! 4
? 1 10
? 6 10
? 8 10
? 6 7
! 6
? 1 10
? 1 5
? 6 10
? 8 10
? 6 7
! 7
? 1 10
? 1 5
? 3 5
? 4 5
! 3
? 1 10
? 6 10
? 1 5
? 3 5
? 1 2
! 1
? 1 10
? 1 5
? 3 5
? 1 2
! 1
? 1 10
? 1 5
? 6 10
? 8 10
? 9 10
! 8
? 1 10
? 1 5
? 6 10
? 8 10
? 6 7
! 7
? 1 10
? 1 5
? 6 10
? 8 10
?...

result:

wrong answer Too many queries , n = 10 , now_q 6 (test case 11)
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