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ID	Problem	Submitter	Result	Time	Memory	Language	File size	Submit time	Judge time
#130691	#2789. Sorting	Qwerty1232^#	8	2ms	3940kb	C++20	2.4kb	2023-07-24 19:50:07	2024-07-04 00:55:23

Judging History

你现在查看的是最新测评结果

[2024-07-04 00:55:23]
评测

测评结果：8
用时：2ms
内存：3940kb

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[2023-08-10 23:21:45]
System Update: QOJ starts to keep a history of the judgings of all the submissions.

[2023-07-24 19:50:07]
提交

answer

#include "sorting.h"

#include <bits/stdc++.h>

int findSwapPairs(int n, int S[], int M, int X[], int Y[], int P[], int Q[]) {
    if (0 && std::all_of(X, X + M, [&](int a) { return a == 0; }) && std::all_of(Y, Y + M, [&](int a) { return a == 0; })) {
        std::vector<std::pair<int, int>> ans;

        std::vector<int> used(n);
        for (int i = 0; i < n; i++) {
            if (!used[i]) {
                int u = i;
                do {
                    int t = S[u];
                    used[u] = true;
                    if (t != i) {
                        ans.push_back({i, t});
                    }
                    u = t;
                    assert(ans.size() < M);
                } while (u != i);
            }
        }

        for (int i = 0; i < ans.size(); i++) {
            P[i] = ans[i].first;
            Q[i] = ans[i].second;
        }
        return ans.size();
    }

    auto cum = [&](std::vector<std::pair<int, int>> ans) {
        int m = ans.size();
        std::vector<int> p(S, S + n);
        for (int i = 0; i < m; i++) {
            std::swap(p[X[i]], p[Y[i]]);
            std::swap(p[ans[i].first], p[ans[i].second]);
        }
        std::vector<bool> used(n);
        int cnt = 0;
        for (int i = 0; i < n; i++) {
            if (!used[i]) {
                int u = i;
                do {
                    used[u] = true;
                    u = p[u];
                } while (u != i);
                cnt++;
            }
        }
        return cnt;
    };

    static std::mt19937 rnd;

    for (int iter = 0;; iter++) {
        int m = std::min(M, 4 * n);
        std::vector<std::pair<int, int>> ans(m);
        int sc = cum(ans);
        // while (sc < n) {
        for (int f = 0; f < 1e4; f++) {
            int i = rnd() % m;
            std::pair<int, int> pr = {rnd() % n, rnd() % n};
            std::swap(ans[i], pr);
            int sc2 = cum(ans);
            if (sc2 >= sc) {
                if (sc2 > sc) {
                    std::cerr << sc2 << "\n";
                }
                sc = sc2;
            } else {
                std::swap(ans[i], pr);
            }
        }

        if (sc == n) {
            for (int i = 0; i < ans.size(); i++) {
                P[i] = ans[i].first;
                Q[i] = ans[i].second;
            }
            return ans.size();
        }
    }
}

Source code, Language: C++20

Details

Tip: Click on the bar to expand more detailed information

Subtask #1:

score: 8

Accepted

Test #1:

score: 8

Accepted

time: 1ms

memory: 3768kb

input:

output:

1
0 0

result:

ok correct

Test #2:

score: 8

Accepted

time: 1ms

memory: 3864kb

input:

output:

result:

ok correct

Test #3:

score: 8

Accepted

time: 1ms

memory: 3716kb

input:

output:

result:

ok correct

Test #4:

score: 8

Accepted

time: 1ms

memory: 3908kb

input:

output:

result:

ok correct

Test #5:

score: 8

Accepted

time: 0ms

memory: 3776kb

input:

output:

result:

ok correct

Test #6:

score: 8

Accepted

time: 2ms

memory: 3940kb

input:

output:

result:

ok correct

Test #7:

score: 8

Accepted

time: 2ms

memory: 3712kb

input:

output:

result:

ok correct

Subtask #2:

score: 0

Time Limit Exceeded

Test #8:

score: 12

Accepted

time: 1ms

memory: 3712kb

input:

output:

result:

ok correct

Test #9:

score: 12

Accepted

time: 2ms

memory: 3648kb

input:

output:

result:

ok correct

Test #10:

score: 0

Time Limit Exceeded

input:

98
82 70 31 12 27 51 84 90 66 8 49 52 74 91 46 7 96 67 63 85 34 50 87 83 58 78 26 39 77 48 2 55 94 25 61 56 53 13 32 86 72 20 37 73 9 93 65 28 18 11 71 59 88 35 76 40 24 36 33 3 17 29 38 5 21 15 79 30 62 92 45 80 64 95 43 75 97 23 16 57 22 60 41 69 0 42 14 10 47 68 19 4 1 6 44 81 54 89
2940
0 0
0 0
...

output:

Unauthorized output

result:

Subtask #3:

score: 0

Time Limit Exceeded

Test #13:

score: 16

Accepted

time: 1ms

memory: 3648kb

input:

output:

result:

ok correct

Test #14:

score: 16

Accepted

time: 2ms

memory: 3652kb

input:

output:

result:

ok correct

Test #15:

score: 0

Time Limit Exceeded

input:

96
7 15 12 95 11 50 20 42 81 29 58 80 56 71 63 66 44 6 64 39 2 22 73 1 24 27 69 28 45 25 60 61 5 94 14 65 9 86 68 32 79 37 3 57 34 35 10 88 76 78 21 93 19 53 84 52 4 33 38 55 62 67 77 41 31 48 91 49 51 43 90 8 87 54 16 17 70 46 85 0 75 92 74 47 36 89 30 13 59 26 40 18 82 83 72 23
2880
0 1
0 1
0 1
0 ...

output:

Unauthorized output

result:

Subtask #4:

score: 0

Skipped

Dependency #2:

Subtask #5:

score: 0

Time Limit Exceeded

Test #28:

score: 0

Time Limit Exceeded

input:

1800
530 1775 466 953 230 1179 944 752 990 1316 275 1029 158 152 1673 1706 172 115 599 1661 131 699 1112 454 551 1059 291 495 28 67 773 480 839 462 1210 757 879 285 439 3 1429 820 26 1023 942 199 356 625 1705 1421 144 1529 716 7 1485 1027 1599 696 517 1353 456 1389 273 1363 1414 1177 718 41 777 1621...

output:

Unauthorized output

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Judging History

answer

Details

Subtask #1:

Test #1:

input:

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Test #2:

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Test #3:

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Test #4:

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Test #6:

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Test #7:

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Subtask #2:

Test #8:

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Test #10:

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Subtask #3:

Test #13:

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Test #14:

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Test #15:

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Subtask #4:

Dependency #2:

Subtask #5:

Test #28:

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Subtask #6:

Dependency #5: