oj.uz

Submission #535731

# Submission time Handle Problem Language Result Execution time Memory
535731 2022-03-11T03:50:47 Z sam571128 Group Photo (JOI21_ho_t3) C++17
100 / 100
 709 ms 117600 KB 
#include <bits/stdc++.h>

#define int long long
#define fastio ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

using namespace std;

const int N = 5e3+5;
int bit[N][2], inv[N][N];

void update(int idx, int pos, int val){
    while(pos < N){
        bit[pos][idx] += val;
        pos += pos&-pos;
    }
}

int query(int idx, int pos){
    int res = 0;
    while(pos){
        res += bit[pos][idx];
        pos -= pos&-pos;
    }
    return res;
}

signed main(){
    fastio
    int n;
    cin >> n;
    int pos[n+1] = {};

    for(int i = 1;i <= n;i++){
        int x;
        cin >> x;
        pos[x] = i;
    }

    int arr[n+1];
    iota(arr,arr+n+1,0);
    for(int i = 1;i <= n;i++){
        arr[i] = pos[arr[i]];
    }

    for(int i = 1;i <= n;i++){
        for(int j = 0;j <= n;j++){
            bit[j][0] = 0;
        }
        for(int j = i;j <= n;j++){
            inv[i][j] = inv[i][j-1] + query(0,arr[j]) + query(1,N-1) - query(1,arr[j]);
            update(0,arr[j],1); 
        }
        update(1,arr[i],1);
    }

    int dp[n+1] = {};
    fill(dp+1,dp+n+1,1e18);

    for(int i = 1;i <= n;i++){
        for(int j = 0;j < i;j++){
            dp[i] = min(dp[i],dp[j] + inv[j+1][i]);
            //inv => inversions after reverse
        }
    }

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

Subtask #1
5.0 / 5.0

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

Subtask #2
7.0 / 7.0

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

Subtask #3
32.0 / 32.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 1 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 340 KB Output is correct
14 Correct 0 ms 340 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 1 ms 340 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 1 ms 340 KB Output is correct
21 Correct 2 ms 1236 KB Output is correct
22 Correct 2 ms 1236 KB Output is correct
23 Correct 1 ms 1236 KB Output is correct
24 Correct 1 ms 1236 KB Output is correct
25 Correct 1 ms 1236 KB Output is correct
26 Correct 1 ms 1236 KB Output is correct
27 Correct 2 ms 1236 KB Output is correct
28 Correct 2 ms 1236 KB Output is correct
29 Correct 2 ms 1236 KB Output is correct
30 Correct 2 ms 1236 KB Output is correct

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 1 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 340 KB Output is correct
14 Correct 0 ms 340 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 1 ms 340 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 1 ms 340 KB Output is correct
21 Correct 2 ms 1236 KB Output is correct
22 Correct 2 ms 1236 KB Output is correct
23 Correct 1 ms 1236 KB Output is correct
24 Correct 1 ms 1236 KB Output is correct
25 Correct 1 ms 1236 KB Output is correct
26 Correct 1 ms 1236 KB Output is correct
27 Correct 2 ms 1236 KB Output is correct
28 Correct 2 ms 1236 KB Output is correct
29 Correct 2 ms 1236 KB Output is correct
30 Correct 2 ms 1236 KB Output is correct
31 Correct 15 ms 6012 KB Output is correct
32 Correct 15 ms 6100 KB Output is correct
33 Correct 16 ms 6080 KB Output is correct
34 Correct 18 ms 6128 KB Output is correct
35 Correct 18 ms 6100 KB Output is correct
36 Correct 17 ms 6100 KB Output is correct
37 Correct 17 ms 6100 KB Output is correct
38 Correct 15 ms 6016 KB Output is correct
39 Correct 14 ms 6100 KB Output is correct
40 Correct 15 ms 6112 KB Output is correct

Subtask #5
36.0 / 36.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 1 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 340 KB Output is correct
14 Correct 0 ms 340 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 1 ms 340 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 1 ms 340 KB Output is correct
21 Correct 2 ms 1236 KB Output is correct
22 Correct 2 ms 1236 KB Output is correct
23 Correct 1 ms 1236 KB Output is correct
24 Correct 1 ms 1236 KB Output is correct
25 Correct 1 ms 1236 KB Output is correct
26 Correct 1 ms 1236 KB Output is correct
27 Correct 2 ms 1236 KB Output is correct
28 Correct 2 ms 1236 KB Output is correct
29 Correct 2 ms 1236 KB Output is correct
30 Correct 2 ms 1236 KB Output is correct
31 Correct 15 ms 6012 KB Output is correct
32 Correct 15 ms 6100 KB Output is correct
33 Correct 16 ms 6080 KB Output is correct
34 Correct 18 ms 6128 KB Output is correct
35 Correct 18 ms 6100 KB Output is correct
36 Correct 17 ms 6100 KB Output is correct
37 Correct 17 ms 6100 KB Output is correct
38 Correct 15 ms 6016 KB Output is correct
39 Correct 14 ms 6100 KB Output is correct
40 Correct 15 ms 6112 KB Output is correct
41 Correct 682 ms 117444 KB Output is correct
42 Correct 688 ms 117556 KB Output is correct
43 Correct 674 ms 117388 KB Output is correct
44 Correct 669 ms 117416 KB Output is correct
45 Correct 677 ms 117484 KB Output is correct
46 Correct 664 ms 117532 KB Output is correct
47 Correct 661 ms 117520 KB Output is correct
48 Correct 672 ms 117536 KB Output is correct
49 Correct 677 ms 117564 KB Output is correct
50 Correct 684 ms 117600 KB Output is correct
51 Correct 673 ms 117588 KB Output is correct
52 Correct 659 ms 117536 KB Output is correct
53 Correct 709 ms 117532 KB Output is correct
54 Correct 658 ms 117496 KB Output is correct
55 Correct 679 ms 117536 KB Output is correct