oj.uz

Submission #384951

# Submission time Handle Problem Language Result Execution time Memory
384951 2021-04-02T18:06:31 Z timmyfeng Group Photo (JOI21_ho_t3) C++17
100 / 100
 365 ms 492 KB 
#include <bits/stdc++.h>
using namespace std;

template <class T>
struct fenwick {
    vector<T> tree;
    int n;

    fenwick(int n) : n(n) {
        tree.resize(n + 1);
    }

    void update(int a, T x) {
        for ( ; a <= n; a += (a & -a)) {
            tree[a] += x;
        }
    }

    T query(int a) {
        T res = 0;
        for ( ; a > 0; a -= (a & -a)) {
            res += tree[a];
        }
        return res;
    }

    int lower_bound(T k) {
        int res = 0;
        T sum = 0;
        for (int i = __lg(n); i >= 0; --i) {
            if (res + (1 << i) <= n && sum + tree[res + (1 << i)] < k) {
                res += 1 << i;
                sum += tree[res];
            }
        }
        return res + 1;
    }
};

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int n;
    cin >> n;

    vector<int> perm(n), where(n);
    for (int i = 0; i < n; ++i) {
        cin >> perm[i];
        where[--perm[i]] = i;
    }

    vector<int> ans(n + 1, n * n);
    ans[0] = 0;

    for (int i = 0; i < n; ++i) {
        int segment = 0;
        fenwick<int> sum(n);
        for (int j = 0; i + j < n; ++j) {
            segment += where[i + j] - j + sum.query(where[i + j]);
            ans[i + j + 1] = min(ans[i + j + 1], ans[i] + segment);
            sum.update(where[i + j] + 1, 1);
        }

        for (int j = i + 1; j < n; ++j) {
            where[j] -= where[j] > where[i];
        }
    }

    cout << ans[n] << "\n";
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 2 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 1 ms 364 KB Output is correct

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 2 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 1 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 1 ms 364 KB Output is correct
13 Correct 1 ms 364 KB Output is correct
14 Correct 1 ms 364 KB Output is correct
15 Correct 1 ms 364 KB Output is correct
16 Correct 1 ms 364 KB Output is correct
17 Correct 1 ms 364 KB Output is correct
18 Correct 1 ms 364 KB Output is correct
19 Correct 1 ms 364 KB Output is correct
20 Correct 1 ms 364 KB Output is correct

Subtask #3
32.0 / 32.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 2 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 1 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 1 ms 364 KB Output is correct
13 Correct 1 ms 364 KB Output is correct
14 Correct 1 ms 364 KB Output is correct
15 Correct 1 ms 364 KB Output is correct
16 Correct 1 ms 364 KB Output is correct
17 Correct 1 ms 364 KB Output is correct
18 Correct 1 ms 364 KB Output is correct
19 Correct 1 ms 364 KB Output is correct
20 Correct 1 ms 364 KB Output is correct
21 Correct 1 ms 364 KB Output is correct
22 Correct 2 ms 364 KB Output is correct
23 Correct 1 ms 364 KB Output is correct
24 Correct 1 ms 364 KB Output is correct
25 Correct 2 ms 364 KB Output is correct
26 Correct 1 ms 364 KB Output is correct
27 Correct 2 ms 364 KB Output is correct
28 Correct 1 ms 364 KB Output is correct
29 Correct 1 ms 364 KB Output is correct
30 Correct 1 ms 364 KB Output is correct

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 2 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 1 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 1 ms 364 KB Output is correct
13 Correct 1 ms 364 KB Output is correct
14 Correct 1 ms 364 KB Output is correct
15 Correct 1 ms 364 KB Output is correct
16 Correct 1 ms 364 KB Output is correct
17 Correct 1 ms 364 KB Output is correct
18 Correct 1 ms 364 KB Output is correct
19 Correct 1 ms 364 KB Output is correct
20 Correct 1 ms 364 KB Output is correct
21 Correct 1 ms 364 KB Output is correct
22 Correct 2 ms 364 KB Output is correct
23 Correct 1 ms 364 KB Output is correct
24 Correct 1 ms 364 KB Output is correct
25 Correct 2 ms 364 KB Output is correct
26 Correct 1 ms 364 KB Output is correct
27 Correct 2 ms 364 KB Output is correct
28 Correct 1 ms 364 KB Output is correct
29 Correct 1 ms 364 KB Output is correct
30 Correct 1 ms 364 KB Output is correct
31 Correct 9 ms 364 KB Output is correct
32 Correct 9 ms 364 KB Output is correct
33 Correct 9 ms 364 KB Output is correct
34 Correct 9 ms 364 KB Output is correct
35 Correct 9 ms 364 KB Output is correct
36 Correct 9 ms 364 KB Output is correct
37 Correct 9 ms 364 KB Output is correct
38 Correct 8 ms 364 KB Output is correct
39 Correct 9 ms 364 KB Output is correct
40 Correct 8 ms 364 KB Output is correct

Subtask #5
36.0 / 36.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 2 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 1 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 1 ms 364 KB Output is correct
13 Correct 1 ms 364 KB Output is correct
14 Correct 1 ms 364 KB Output is correct
15 Correct 1 ms 364 KB Output is correct
16 Correct 1 ms 364 KB Output is correct
17 Correct 1 ms 364 KB Output is correct
18 Correct 1 ms 364 KB Output is correct
19 Correct 1 ms 364 KB Output is correct
20 Correct 1 ms 364 KB Output is correct
21 Correct 1 ms 364 KB Output is correct
22 Correct 2 ms 364 KB Output is correct
23 Correct 1 ms 364 KB Output is correct
24 Correct 1 ms 364 KB Output is correct
25 Correct 2 ms 364 KB Output is correct
26 Correct 1 ms 364 KB Output is correct
27 Correct 2 ms 364 KB Output is correct
28 Correct 1 ms 364 KB Output is correct
29 Correct 1 ms 364 KB Output is correct
30 Correct 1 ms 364 KB Output is correct
31 Correct 9 ms 364 KB Output is correct
32 Correct 9 ms 364 KB Output is correct
33 Correct 9 ms 364 KB Output is correct
34 Correct 9 ms 364 KB Output is correct
35 Correct 9 ms 364 KB Output is correct
36 Correct 9 ms 364 KB Output is correct
37 Correct 9 ms 364 KB Output is correct
38 Correct 8 ms 364 KB Output is correct
39 Correct 9 ms 364 KB Output is correct
40 Correct 8 ms 364 KB Output is correct
41 Correct 353 ms 492 KB Output is correct
42 Correct 344 ms 492 KB Output is correct
43 Correct 350 ms 476 KB Output is correct
44 Correct 345 ms 364 KB Output is correct
45 Correct 347 ms 492 KB Output is correct
46 Correct 349 ms 476 KB Output is correct
47 Correct 344 ms 492 KB Output is correct
48 Correct 365 ms 492 KB Output is correct
49 Correct 348 ms 364 KB Output is correct
50 Correct 347 ms 492 KB Output is correct
51 Correct 353 ms 364 KB Output is correct
52 Correct 346 ms 492 KB Output is correct
53 Correct 346 ms 476 KB Output is correct
54 Correct 350 ms 476 KB Output is correct
55 Correct 346 ms 492 KB Output is correct