oj.uz

Submission #869945

# Submission time Handle Problem Language Result Execution time Memory
869945 2023-11-06T11:55:06 Z boris_mihov Group Photo (JOI21_ho_t3) C++17
100 / 100
 343 ms 800 KB 
#include <algorithm>
#include <iostream>
#include <numeric>
#include <vector>
 
typedef long long llong;
const int MAXN = 5000 + 10;
const int INF  = 1e9;
 
int n;
int a[MAXN];
int dp[MAXN];
int pos[MAXN];
 
struct Fenwick
{
    int tree[MAXN];
    void reset()
    {
        std::fill(tree + 1, tree + 1 + n, 0);
    }

    void update(int pos, int value)
    {
        for (int idx = pos ; idx <= n ; idx += idx & (-idx))
        {
            tree[idx] += value;
        }
    }
    
    int query(int pos)
    {
        int res = 0;
        for (int idx = pos ; idx > 0 ; idx -= idx & (-idx))
        {
            res += tree[idx];
        }
    
        return res;
    }
};

Fenwick treePos;
Fenwick treeSmaller;
void solve()
{
    dp[n + 1] = 0;
    for (int from = n ; from >= 1 ; --from)
    {
        treeSmaller.reset();
        treePos.update(pos[from], 1);
        dp[from] = INF;
        int add = 0;
 
        for (int next = from ; next <= n ; ++next)
        {
            treeSmaller.update(pos[next], 1);
            add += treePos.query(pos[next]) - 1;
            add -= treeSmaller.query(n) - treeSmaller.query(pos[next]);
            dp[from] = std::min(dp[from], dp[next + 1] + add);
        }
    }
 
    std::cout << dp[1] << '\n';
}
 
void input()
{
    std::cin >> n;
    for (int i = 1 ; i <= n ; ++i)
    {
        std::cin >> a[i];
        pos[a[i]] = i;
    }
}
 
void fastIOI()
{
    std::ios_base :: sync_with_stdio(0);
    std::cout.tie(nullptr);
    std::cin.tie(nullptr);
}
 
int main()
{
    fastIOI();
    input();
    solve();
 
    return 0;
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 344 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct

Subtask #3
32.0 / 32.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 344 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 1 ms 348 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 1 ms 348 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 0 ms 464 KB Output is correct
27 Correct 1 ms 348 KB Output is correct
28 Correct 1 ms 348 KB Output is correct
29 Correct 1 ms 348 KB Output is correct
30 Correct 1 ms 348 KB Output is correct

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 344 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 1 ms 348 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 1 ms 348 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 0 ms 464 KB Output is correct
27 Correct 1 ms 348 KB Output is correct
28 Correct 1 ms 348 KB Output is correct
29 Correct 1 ms 348 KB Output is correct
30 Correct 1 ms 348 KB Output is correct
31 Correct 5 ms 348 KB Output is correct
32 Correct 5 ms 500 KB Output is correct
33 Correct 5 ms 492 KB Output is correct
34 Correct 4 ms 348 KB Output is correct
35 Correct 4 ms 500 KB Output is correct
36 Correct 4 ms 348 KB Output is correct
37 Correct 4 ms 348 KB Output is correct
38 Correct 4 ms 348 KB Output is correct
39 Correct 5 ms 464 KB Output is correct
40 Correct 4 ms 348 KB Output is correct

Subtask #5
36.0 / 36.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 344 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 1 ms 348 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 1 ms 348 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 0 ms 464 KB Output is correct
27 Correct 1 ms 348 KB Output is correct
28 Correct 1 ms 348 KB Output is correct
29 Correct 1 ms 348 KB Output is correct
30 Correct 1 ms 348 KB Output is correct
31 Correct 5 ms 348 KB Output is correct
32 Correct 5 ms 500 KB Output is correct
33 Correct 5 ms 492 KB Output is correct
34 Correct 4 ms 348 KB Output is correct
35 Correct 4 ms 500 KB Output is correct
36 Correct 4 ms 348 KB Output is correct
37 Correct 4 ms 348 KB Output is correct
38 Correct 4 ms 348 KB Output is correct
39 Correct 5 ms 464 KB Output is correct
40 Correct 4 ms 348 KB Output is correct
41 Correct 341 ms 552 KB Output is correct
42 Correct 329 ms 548 KB Output is correct
43 Correct 336 ms 344 KB Output is correct
44 Correct 343 ms 572 KB Output is correct
45 Correct 340 ms 556 KB Output is correct
46 Correct 327 ms 564 KB Output is correct
47 Correct 327 ms 348 KB Output is correct
48 Correct 336 ms 600 KB Output is correct
49 Correct 336 ms 552 KB Output is correct
50 Correct 335 ms 800 KB Output is correct
51 Correct 334 ms 348 KB Output is correct
52 Correct 333 ms 592 KB Output is correct
53 Correct 329 ms 344 KB Output is correct
54 Correct 332 ms 348 KB Output is correct
55 Correct 331 ms 348 KB Output is correct