oj.uz

Submission #831087

# Submission time Handle Problem Language Result Execution time Memory
831087 2023-08-19T17:15:01 Z skittles1412 Sorting (IOI15_sorting) C++17
74 / 100
 1000 ms 23372 KB 
#include "bits/extc++.h"

using namespace std;

template <typename T, typename... U>
void dbgh(const T& t, const U&... u) {
    cerr << t;
    ((cerr << " | " << u), ...);
    cerr << endl;
}

#ifdef DEBUG
#define dbg(...)                                              \
    cerr << "L" << __LINE__ << " [" << #__VA_ARGS__ << "]: "; \
    dbgh(__VA_ARGS__)
#else
#define dbg(...)
#define cerr   \
    if (false) \
    cerr
#endif

#define endl "\n"
#define long int64_t
#define sz(x) int(std::size(x))

template <typename T>
ostream& operator<<(ostream& out, const vector<T>& arr) {
    out << "[";
    for (int i = 0; i < sz(arr); i++) {
        if (i) {
            out << ", ";
        }
        out << arr[i];
    }
    return out << "]";
}

template <typename A, typename B>
ostream& operator<<(ostream& out, const pair<A, B>& p) {
    return out << "(" << p.first << ", " << p.second << ")";
}

vector<pair<int, int>> min_sort(vector<int> arr) {
    int n = sz(arr);

    vector<pair<int, int>> ans;

    for (int i = 0; i < n; i++) {
        if (arr[i] == i) {
            continue;
        }
        int u = int(find(begin(arr), end(arr), i) - arr.begin());
        ans.emplace_back(i, u);
        swap(arr[i], arr[u]);
    }

    return ans;
}

optional<vector<pair<int, int>>> solve(vector<int> arr,
                                       const vector<pair<int, int>>& swaps) {
    int n = sz(arr);

    vector<int> res(n), pos(n);

    for (int i = 0; i < n; i++) {
        pos[arr[i]] = i;
    }

    {
        auto tmp = arr;
        for (auto& [u, v] : swaps) {
            swap(tmp[u], tmp[v]);
        }
        for (int i = 0; i < n; i++) {
            res[tmp[i]] = i;
        }
    }

    auto ans_swaps = min_sort(res);

    if (sz(ans_swaps) > sz(swaps)) {
        return {};
    }

    vector<pair<int, int>> ans;

    auto do_swap = [&](int u, int v, bool swap_res) -> void {
        swap(arr[u], arr[v]);
        swap(pos[arr[u]], pos[arr[v]]);
        if (swap_res) {
            swap(res[arr[u]], res[arr[v]]);
        }
    };

    for (int t = 0; t < sz(ans_swaps); t++) {
        {
            auto& [u, v] = swaps[t];
            do_swap(u, v, false);
        }
        {
            auto& [u, v] = ans_swaps[t];
            ans.emplace_back(pos[u], pos[v]);
            do_swap(pos[u], pos[v], true);
        }
    }
    for (int t = sz(ans_swaps); t < sz(swaps); t++) {
        ans.emplace_back(0, 0);
    }

    return ans;
}

void grade(vector<int> arr,
           const vector<pair<int, int>>& swaps,
           const vector<pair<int, int>>& ans_swaps) {
    assert(sz(ans_swaps) <= sz(swaps));

    for (int i = 0; i < sz(ans_swaps); i++) {
        if (is_sorted(begin(arr), end(arr))) {
            return;
        }
        {
            auto [u, v] = swaps[i];
            swap(arr[u], arr[v]);
        }
        {
            auto [u, v] = ans_swaps[i];
            swap(arr[u], arr[v]);
        }
    }

    assert(is_sorted(begin(arr), end(arr)));
}

int findSwapPairs(int n,
                  int p_arr[],
                  int m,
                  int swaps_x[],
                  int swaps_y[],
                  int out_p[],
                  int out_q[]) {
    vector<int> arr(p_arr, p_arr + n);

    vector<pair<int, int>> swaps(m);
    for (int i = 0; i < m; i++) {
        swaps[i] = {swaps_x[i], swaps_y[i]};
    }

    int l = 0, r = sz(swaps);
    while (l < r) {
        int mid = (l + r) / 2;
        if (solve(arr, vector(swaps.begin(), swaps.begin() + mid))) {
            r = mid;
        } else {
            l = mid + 1;
        }
    }
    auto ans = solve(arr, vector(swaps.begin(), swaps.begin() + l)).value();

    for (int i = 0; i < sz(ans); i++) {
        auto& [p, q] = ans[i];
        out_p[i] = p;
        out_q[i] = q;
    }

    grade(arr, swaps, ans);
    return sz(ans);
}

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 0 ms 340 KB Output is correct
12 Correct 0 ms 340 KB Output is correct

Subtask #3
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 0 ms 212 KB Output is correct

Subtask #4
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 0 ms 340 KB Output is correct
12 Correct 0 ms 340 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 0 ms 212 KB Output is correct
15 Correct 0 ms 340 KB Output is correct
16 Correct 0 ms 340 KB Output is correct
17 Correct 0 ms 340 KB Output is correct
18 Correct 0 ms 212 KB Output is correct
19 Correct 1 ms 212 KB Output is correct
20 Correct 0 ms 212 KB Output is correct
21 Correct 2 ms 724 KB Output is correct
22 Correct 2 ms 724 KB Output is correct
23 Correct 2 ms 824 KB Output is correct
24 Correct 2 ms 724 KB Output is correct
25 Correct 1 ms 816 KB Output is correct
26 Correct 2 ms 824 KB Output is correct
27 Correct 2 ms 724 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 468 KB Output is correct
2 Correct 17 ms 596 KB Output is correct
3 Correct 14 ms 588 KB Output is correct
4 Correct 3 ms 596 KB Output is correct
5 Correct 4 ms 504 KB Output is correct
6 Correct 5 ms 596 KB Output is correct
7 Correct 10 ms 596 KB Output is correct
8 Correct 15 ms 600 KB Output is correct
9 Correct 17 ms 580 KB Output is correct
10 Correct 16 ms 596 KB Output is correct
11 Correct 15 ms 596 KB Output is correct
12 Correct 10 ms 616 KB Output is correct
13 Correct 15 ms 596 KB Output is correct
14 Correct 1 ms 520 KB Output is correct

Subtask #6
0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 468 KB Output is correct
2 Correct 17 ms 596 KB Output is correct
3 Correct 14 ms 588 KB Output is correct
4 Correct 3 ms 596 KB Output is correct
5 Correct 4 ms 504 KB Output is correct
6 Correct 5 ms 596 KB Output is correct
7 Correct 10 ms 596 KB Output is correct
8 Correct 15 ms 600 KB Output is correct
9 Correct 17 ms 580 KB Output is correct
10 Correct 16 ms 596 KB Output is correct
11 Correct 15 ms 596 KB Output is correct
12 Correct 10 ms 616 KB Output is correct
13 Correct 15 ms 596 KB Output is correct
14 Correct 1 ms 520 KB Output is correct
15 Execution timed out 1030 ms 23372 KB Time limit exceeded
16 Halted 0 ms 0 KB -