oj.uz

Submission #375545

# Submission time Handle Problem Language Result Execution time Memory
375545 2021-03-09T13:59:26 Z spatarel Skyscraper (JOI16_skyscraper) C++17
100 / 100
 211 ms 6764 KB 
#include <stdio.h>
#include <algorithm>
 
const int MOD = 1000000007;
 
const int MAX_N = 100;
const int MAX_L = 1000;
 
long long Count[2][1 + MAX_N + 1][1 + MAX_L][1 + 2 + 1];
 
void addSelf(long long &a, long long b) {
  a = (a + b) % MOD;
}

int main() {
  int N, L;
  scanf("%d%d", &N, &L);
  int A[1 + N];
  for (int i = 1; i <= N; i++) {
    scanf("%d", &A[i]);
  }
  A[0] = A[1];
  std::sort(A + 1, A + N + 1);
  Count[0][0][0][0] = 1;
  int I = 0;
  int newI = 1;
  for (int i = 0; i + 1 <= N; i++) {
    for (int d = 0; d <= N; d++) {
      for (int l = 0; l <= L; l++) {
        for (int e = 0; e <= 2; e++) {
          Count[newI][d][l][e] = 0;
        }
      }
    }
    for (int d = 0; d <= N; d++) {
      for (int l = 0; l <= L; l++) {
        for (int e = 0; e <= 2; e++) {
          int newL = l+(2*d-e)*(A[i+1]-A[i]);
          if (0 <= newL && newL <= L) {
            addSelf(Count[newI][d + 1][newL][e]    , (d+1-e) * Count[I][d][l][e]); // valley
            if (0 <= d - 1) {
            addSelf(Count[newI][d - 1][newL][e]    , (d-1)   * Count[I][d][l][e]); // peak
            }
            addSelf(Count[newI][d + 0][newL][e]    , (2*d-e) * Count[I][d][l][e]); // edge
            addSelf(Count[newI][d + 0][newL][e + 1], (2-e)   * Count[I][d][l][e]); // edge ending
            addSelf(Count[newI][d + 1][newL][e + 1], (2-e)   * Count[I][d][l][e]); // valley ending
          }
        }
      }
    }
    std::swap(I, newI);
  }
  long long answer = 0;
  for (int l = 0; l <= L; l++) {
    addSelf(answer, Count[N % 2][1][l][2]);
  }
  if (N == 1) {
    answer = 1;
  }
  printf("%lld\n", answer);
  return 0;
}

Compilation message

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:17:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   17 |   scanf("%d%d", &N, &L);
      |   ~~~~~^~~~~~~~~~~~~~~~
skyscraper.cpp:20:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   20 |     scanf("%d", &A[i]);
      |     ~~~~~^~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 364 KB Output is correct
2 Correct 0 ms 364 KB Output is correct
3 Correct 0 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 2 ms 876 KB Output is correct
6 Correct 2 ms 876 KB Output is correct
7 Correct 1 ms 492 KB Output is correct
8 Correct 1 ms 492 KB Output is correct
9 Correct 2 ms 876 KB Output is correct
10 Correct 1 ms 492 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 492 KB Output is correct
2 Correct 1 ms 492 KB Output is correct
3 Correct 1 ms 492 KB Output is correct
4 Correct 1 ms 492 KB Output is correct
5 Correct 1 ms 492 KB Output is correct
6 Correct 1 ms 488 KB Output is correct
7 Correct 1 ms 492 KB Output is correct
8 Correct 1 ms 492 KB Output is correct
9 Correct 1 ms 492 KB Output is correct
10 Correct 1 ms 492 KB Output is correct

Subtask #3
80.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 364 KB Output is correct
2 Correct 0 ms 364 KB Output is correct
3 Correct 0 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 2 ms 876 KB Output is correct
6 Correct 2 ms 876 KB Output is correct
7 Correct 1 ms 492 KB Output is correct
8 Correct 1 ms 492 KB Output is correct
9 Correct 2 ms 876 KB Output is correct
10 Correct 1 ms 492 KB Output is correct
11 Correct 1 ms 492 KB Output is correct
12 Correct 1 ms 492 KB Output is correct
13 Correct 1 ms 492 KB Output is correct
14 Correct 1 ms 492 KB Output is correct
15 Correct 1 ms 492 KB Output is correct
16 Correct 1 ms 488 KB Output is correct
17 Correct 1 ms 492 KB Output is correct
18 Correct 1 ms 492 KB Output is correct
19 Correct 1 ms 492 KB Output is correct
20 Correct 1 ms 492 KB Output is correct
21 Correct 2 ms 768 KB Output is correct
22 Correct 184 ms 5228 KB Output is correct
23 Correct 211 ms 6636 KB Output is correct
24 Correct 180 ms 5868 KB Output is correct
25 Correct 211 ms 6764 KB Output is correct
26 Correct 185 ms 6636 KB Output is correct
27 Correct 64 ms 2668 KB Output is correct
28 Correct 95 ms 3052 KB Output is correct
29 Correct 167 ms 4716 KB Output is correct
30 Correct 211 ms 6636 KB Output is correct