oj.uz

Submission #535535

# Submission time Handle Problem Language Result Execution time Memory
535535 2022-03-10T13:03:09 Z extraterrestrial Arranging Tickets (JOI17_arranging_tickets) C++17
45 / 100
 6000 ms 532 KB 
#pragma GCC optimize("Ofast")
#pragma GCC target("avx2")
#include <bits/stdc++.h>
typedef long long ll;
typedef long double ld;
using namespace std;
#define all(x) (x).begin(), (x).end()
#define SZ(x) (int)(x).size()

struct fenwick {
    int n;
    vector<int> t;
    explicit fenwick(int _n) : n(_n) {
        t.resize(n + 1, 0);
    }
    void update(int v, int delta) {
        for (; v <= n; v += v & (-v)) {
            t[v] += delta;
        }
    }
    void add_on_segment(int l, int r, int delta) {
        l++, r++;
        update(l, delta);
        update(r + 1, -delta);
    }
    int get_value(int v) {
        v++;
        int result = 0;
        for (; v > 0; v -= v & (-v)) {
            result += t[v];
        }
        return result;
    }
};

signed main() {
#ifdef PC
    freopen("input.txt", "r", stdin);
#endif
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    int n, m;
    cin >> n >> m;
    vector<vector<int>> have(n);
    for (int i = 0; i < m; i++) {
        int from, to, cnt;
        cin >> from >> to >> cnt;
        from--, to--;
        if (from > to) {
            swap(from, to);
        }
        if (from < to) {
            have[from].push_back(to - 1);
        }
    }
    int l = -1, r = m;
    while (r - l > 1) {
        int mid = (l + r) / 2;
        bool can = false;
        for (int cnt_flip = 0; cnt_flip <= mid; cnt_flip++) {
            multiset<pair<int, int>> segments;
            fenwick cnt(n);
            for (int left_border = 0; left_border < n; left_border++) {
                for (auto right_border : have[left_border]) {
                    cnt.add_on_segment(left_border, right_border, 1);
                }
            }

            bool ok = true;
            int already_flipped = 0;
            for (int i = 0; i + 1 < n; i++) {
                int need_flip = max(0, (cnt.get_value(i) + (cnt_flip - already_flipped) - mid + 1) / 2);
                if (already_flipped + need_flip > cnt_flip) {
                    ok = false;
                    break;
                }
                for (auto right_border : have[i]) {
                    segments.insert({right_border, i});
                }
                if (SZ(segments) < need_flip) {
                    ok = false;
                    break;
                }
                for (int j = 0; j < need_flip; j++) {
                    auto [right_border, left_border] = *segments.rbegin();
                    segments.erase(--segments.end());

                    cnt.update(1, 1);
                    cnt.update(left_border + 1, -2);
                    cnt.update(right_border + 2, 2);
                }
                while (!segments.empty() && segments.begin()->first < i + 1) {
                    segments.erase(segments.begin());
                }
                already_flipped += need_flip;
            }
            if (ok) {
                for (int i = 0; i < n; i++) {
                    if (cnt.get_value(i) > mid) {
                        ok = false;
                        break;
                    }
                }    
            }
            if (ok) {
                can = true;
                break;
            }
        }
        if (can) {
            r = mid;
        } else {
            l = mid;
        }
    }
    cout << r << '\n';
}

Subtask #1
10.0 / 10.0

# 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 0 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 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 0 ms 212 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 0 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct

Subtask #2
35.0 / 35.0

# 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 0 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 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 0 ms 212 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 0 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 31 ms 332 KB Output is correct
17 Correct 27 ms 340 KB Output is correct
18 Correct 27 ms 212 KB Output is correct
19 Correct 32 ms 344 KB Output is correct
20 Correct 29 ms 340 KB Output is correct
21 Correct 30 ms 340 KB Output is correct
22 Correct 28 ms 336 KB Output is correct
23 Correct 29 ms 336 KB Output is correct
24 Correct 29 ms 212 KB Output is correct
25 Correct 26 ms 336 KB Output is correct
26 Correct 24 ms 212 KB Output is correct
27 Correct 22 ms 340 KB Output is correct

Subtask #3
0 / 20.0

# 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 0 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 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 0 ms 212 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 0 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 31 ms 332 KB Output is correct
17 Correct 27 ms 340 KB Output is correct
18 Correct 27 ms 212 KB Output is correct
19 Correct 32 ms 344 KB Output is correct
20 Correct 29 ms 340 KB Output is correct
21 Correct 30 ms 340 KB Output is correct
22 Correct 28 ms 336 KB Output is correct
23 Correct 29 ms 336 KB Output is correct
24 Correct 29 ms 212 KB Output is correct
25 Correct 26 ms 336 KB Output is correct
26 Correct 24 ms 212 KB Output is correct
27 Correct 22 ms 340 KB Output is correct
28 Correct 5299 ms 500 KB Output is correct
29 Correct 5721 ms 500 KB Output is correct
30 Correct 5340 ms 532 KB Output is correct
31 Execution timed out 6037 ms 468 KB Time limit exceeded
32 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# 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 0 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 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 0 ms 212 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 0 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 31 ms 332 KB Output is correct
17 Correct 27 ms 340 KB Output is correct
18 Correct 27 ms 212 KB Output is correct
19 Correct 32 ms 344 KB Output is correct
20 Correct 29 ms 340 KB Output is correct
21 Correct 30 ms 340 KB Output is correct
22 Correct 28 ms 336 KB Output is correct
23 Correct 29 ms 336 KB Output is correct
24 Correct 29 ms 212 KB Output is correct
25 Correct 26 ms 336 KB Output is correct
26 Correct 24 ms 212 KB Output is correct
27 Correct 22 ms 340 KB Output is correct
28 Correct 5299 ms 500 KB Output is correct
29 Correct 5721 ms 500 KB Output is correct
30 Correct 5340 ms 532 KB Output is correct
31 Execution timed out 6037 ms 468 KB Time limit exceeded
32 Halted 0 ms 0 KB -

Subtask #5
0 / 15.0

# 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 0 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 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 0 ms 212 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 0 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 31 ms 332 KB Output is correct
17 Correct 27 ms 340 KB Output is correct
18 Correct 27 ms 212 KB Output is correct
19 Correct 32 ms 344 KB Output is correct
20 Correct 29 ms 340 KB Output is correct
21 Correct 30 ms 340 KB Output is correct
22 Correct 28 ms 336 KB Output is correct
23 Correct 29 ms 336 KB Output is correct
24 Correct 29 ms 212 KB Output is correct
25 Correct 26 ms 336 KB Output is correct
26 Correct 24 ms 212 KB Output is correct
27 Correct 22 ms 340 KB Output is correct
28 Correct 5299 ms 500 KB Output is correct
29 Correct 5721 ms 500 KB Output is correct
30 Correct 5340 ms 532 KB Output is correct
31 Execution timed out 6037 ms 468 KB Time limit exceeded
32 Halted 0 ms 0 KB -