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IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#99443#6303. Inversionrgnerdplayer#WA 294ms18864kbC++202.3kb2023-04-22 15:41:402023-04-22 15:41:42

Judging History

你现在查看的是最新测评结果

  • [2023-08-10 23:21:45]
  • System Update: QOJ starts to keep a history of the judgings of all the submissions.
  • [2023-04-22 15:41:42]
  • 评测
  • 测评结果:WA
  • 用时:294ms
  • 内存:18864kb
  • [2023-04-22 15:41:40]
  • 提交

answer

#include <bits/stdc++.h>
using namespace std;

using i64 = long long;

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int rand(int l, int r) {
    // [l, r]
    uniform_int_distribution<int> uni(l, r);
    return uni(rng);
}

int main() {
    cin.tie(nullptr)->sync_with_stdio(false);

#ifdef LOCAL
    // freopen("input.txt", "r", stdin);
    // freopen("output.txt", "w", stdout);
#endif

    auto solve = [&]() {
        int n;
        cin >> n;

        vector<int> ord{0};
        vector inv(n, vector<int>(n));

        for (int i = 1; i < n; i++) {
            auto ask = [&](int l, int r) {
                #ifdef LOCAL
                vector<int> p{5, 1, 2, 4, 3};
                int res = 0;
                for (int x = l; x <= r; x++) {
                    for (int y = x + 1; y <= r; y++) {
                        res ^= p[x] > p[y];
                    }
                }
                return res;
                #else
                if (l != r && r == i) {
                    cout << "? " << l + 1 << ' ' << r + 1 << endl;
                    int res;
                    cin >> res;
                    return res;
                } else {
                    return inv[l][r] % 2;
                }
                #endif
            };

            int low = 0, high = ord.size();
            while (low < high) {
                int mid = low + high >> 1;
                int j = ord[mid];
                if ((ask(j, i) ^ ask(j + 1, i) ^ ask(j, i - 1) ^ ask(j + 1, i - 1)) != 0) {
                    high = mid;
                } else {
                    low = mid + 1;
                }
            }

            for (int j = low; j < int(ord.size()); j++) {
                inv[ord[j]][i] = 1;
            }
            for (int j = i - 1; j >= 0; j--) {
                inv[j][i] += inv[j][i] + inv[j + 1][i];
            }

            ord.insert(ord.begin() + low, i);
        }

        vector<int> ans(n);
        for (int i = 0; i < n; i++) {
            ans[ord[i]] = i;
        }

        cout << '!';

        for (int i = 0; i < n; i++) {
            cout << ' ' << ans[i] + 1;
        }
        cout << endl;
    };
    
    solve();
    
    return 0;
}

Details

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Test #1:

score: 100
Accepted
time: 2ms
memory: 3444kb

input:

3
0
1
0
1

output:

? 1 2
? 2 3
? 1 3
? 2 3
! 2 3 1

result:

ok OK, guesses=4

Test #2:

score: -100
Wrong Answer
time: 294ms
memory: 18864kb

input:

1993
0
0
0
0
0
0
1
1
0
0
1
0
0
0
0
0
1
0
1
0
1
1
0
0
1
0
1
1
0
1
1
0
0
1
1
1
0
0
1
1
0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
0
1
0
1
1
1
1
0
1
1
1
1
1
0
0
0
1
1
1
0
0
0
0
0
1
0
1
0
0
0
0
0
1
0
1
1
1
1
1
1
0
1
1
0
0
1
0
1
0
0
0
0
1
1
0
1
0
1
1
0
1
0
0
0
0
1
0
1
1
0
0
1
0
1
0
1
0
1
0
0
0
0
0
0
1
0
0
1...

output:

? 1 2
? 2 3
? 2 4
? 3 4
? 3 4
? 3 5
? 4 5
? 2 5
? 3 5
? 1 5
? 2 5
? 2 6
? 3 6
? 4 6
? 5 6
? 3 7
? 4 7
? 1 7
? 2 7
? 5 7
? 6 7
? 2 8
? 3 8
? 5 8
? 6 8
? 7 8
? 2 9
? 3 9
? 4 9
? 5 9
? 3 9
? 4 9
? 2 10
? 3 10
? 5 10
? 6 10
? 1 10
? 2 10
? 2 11
? 3 11
? 4 11
? 5 11
? 3 11
? 4 11
? 9 11
? 10 11
? 2 12
? ...

result:

wrong answer Wa.