oj.uz

Submission #807716

# Submission time Handle Problem Language Result Execution time Memory
807716 2023-08-04T22:42:07 Z dong_liu Group Photo (JOI21_ho_t3) C++17
100 / 100
 309 ms 98324 KB 
#include <iostream>
using namespace std;

const int N = 5e3;

int main() {
  int n;
  scanf("%d", &n);
  static int o[N + 1];
  for (int i = 1; i <= n; i++) {
    int a;
    scanf("%d", &a);
    o[a] = i;
  }
  static int s[N + 1][N + 1];
  for (int i = 1; i <= n; i++)
    for (int j = 1; j <= n; j++)
      s[i][j] =
          s[i - 1][j] + s[i][j - 1] - s[i - 1][j - 1] + (i < j && o[i] > o[j]);
  auto inv = [&](int i1, int i2, int j1, int j2) {
    return s[i2][j2] - s[i1 - 1][j2] - s[i2][j1 - 1] + s[i1 - 1][j1 - 1];
  };
  auto ninv = [&](int i, int j) {
    return (j - i + 1) * (j - i) / 2 - inv(i, j, i, j);
  };
  static int f[N + 1];
  for (int i = 1; i <= n; i++) {
    f[i] = ninv(1, i);
    for (int j = 1; j < i; j++)
      f[i] = min(f[i], f[j] + inv(1, j, j + 1, i) + ninv(j + 1, i));
  }
  printf("%d\n", f[n]);
  return 0;
}

Compilation message

Main.cpp: In function 'int main()':
Main.cpp:8:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    8 |   scanf("%d", &n);
      |   ~~~~~^~~~~~~~~~
Main.cpp:12:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |     scanf("%d", &a);
      |     ~~~~~^~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 308 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 312 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 312 KB Output is correct

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 308 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 312 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 312 KB Output is correct
11 Correct 1 ms 280 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 308 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 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 312 KB Output is correct

Subtask #3
32.0 / 32.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 308 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 312 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 312 KB Output is correct
11 Correct 1 ms 280 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 308 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 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 312 KB Output is correct
21 Correct 1 ms 1204 KB Output is correct
22 Correct 1 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 1 ms 1204 KB Output is correct
28 Correct 1 ms 1236 KB Output is correct
29 Correct 1 ms 1236 KB Output is correct
30 Correct 1 ms 1236 KB Output is correct

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 308 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 312 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 312 KB Output is correct
11 Correct 1 ms 280 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 308 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 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 312 KB Output is correct
21 Correct 1 ms 1204 KB Output is correct
22 Correct 1 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 1 ms 1204 KB Output is correct
28 Correct 1 ms 1236 KB Output is correct
29 Correct 1 ms 1236 KB Output is correct
30 Correct 1 ms 1236 KB Output is correct
31 Correct 6 ms 5972 KB Output is correct
32 Correct 6 ms 5972 KB Output is correct
33 Correct 6 ms 6004 KB Output is correct
34 Correct 6 ms 5972 KB Output is correct
35 Correct 7 ms 5972 KB Output is correct
36 Correct 6 ms 6008 KB Output is correct
37 Correct 6 ms 5940 KB Output is correct
38 Correct 6 ms 5940 KB Output is correct
39 Correct 6 ms 5972 KB Output is correct
40 Correct 6 ms 5996 KB Output is correct

Subtask #5
36.0 / 36.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 308 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 312 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 312 KB Output is correct
11 Correct 1 ms 280 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 308 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 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 312 KB Output is correct
21 Correct 1 ms 1204 KB Output is correct
22 Correct 1 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 1 ms 1204 KB Output is correct
28 Correct 1 ms 1236 KB Output is correct
29 Correct 1 ms 1236 KB Output is correct
30 Correct 1 ms 1236 KB Output is correct
31 Correct 6 ms 5972 KB Output is correct
32 Correct 6 ms 5972 KB Output is correct
33 Correct 6 ms 6004 KB Output is correct
34 Correct 6 ms 5972 KB Output is correct
35 Correct 7 ms 5972 KB Output is correct
36 Correct 6 ms 6008 KB Output is correct
37 Correct 6 ms 5940 KB Output is correct
38 Correct 6 ms 5940 KB Output is correct
39 Correct 6 ms 5972 KB Output is correct
40 Correct 6 ms 5996 KB Output is correct
41 Correct 274 ms 98144 KB Output is correct
42 Correct 254 ms 98168 KB Output is correct
43 Correct 268 ms 98188 KB Output is correct
44 Correct 281 ms 98180 KB Output is correct
45 Correct 267 ms 98112 KB Output is correct
46 Correct 262 ms 98124 KB Output is correct
47 Correct 271 ms 98204 KB Output is correct
48 Correct 265 ms 98216 KB Output is correct
49 Correct 271 ms 98116 KB Output is correct
50 Correct 270 ms 98212 KB Output is correct
51 Correct 309 ms 98324 KB Output is correct
52 Correct 274 ms 98224 KB Output is correct
53 Correct 269 ms 98208 KB Output is correct
54 Correct 269 ms 98216 KB Output is correct
55 Correct 280 ms 98252 KB Output is correct