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Submission #372812

# Submission time Handle Problem Language Result Execution time Memory
372812 2021-03-01T20:39:46 Z MiricaMatei Skyscraper (JOI16_skyscraper) C++14
100 / 100
 106 ms 2924 KB 
#include <bits/stdc++.h>

using namespace std;

const int MAXN = 105;
const int MAXL = 1005;
const int MOD = 1e9 + 7;

int a[MAXN];
int dp[3][MAXN][MAXL][3];

int main() {
  //freopen("date.in", "r", stdin);
  //freopen("date.out", "w", stdout);

  int n, l;
  scanf("%d%d", &n, &l);
  for (int i = 1; i <= n; ++i)
    scanf("%d", &a[i]);

  sort(a + 1, a + n + 1);
  reverse(a + 1, a + n + 1);

  dp[1][0][0][0] = 1;
  dp[1][0][0][1] = 2;
  dp[1][0][0][2] = 1;
  for (int i = 1; i < n; ++i) {
    int dif = a[i] - a[i + 1];
    int pv = i & 1;
    int nx = (pv ^ 1);
    for (int j = 0; j <= i + 1; ++j) {
      for (int s = 0; s <= l; ++s) {
        for (int e = 0; e <= 2; ++e) {
          int ns = s + dif * (2 * j + 2 - e);
          if (ns > l)
            continue;
          if (j - 1 >= 0)
            dp[nx][j - 1][ns][e] = (dp[nx][j - 1][ns][e] + 1LL * j * dp[pv][j][s][e]) % MOD;
          dp[nx][j][ns][e] = (dp[nx][j][ns][e] + 1LL * (2 * j + 2 - e) * dp[pv][j][s][e]) % MOD;
          dp[nx][j + 1][ns][e] = (dp[nx][j + 1][ns][e] + 1LL * (j + 2 - e) * dp[pv][j][s][e]) % MOD;

          if (e + 1 <= 2)
            dp[nx][j][ns][e + 1] = (dp[nx][j][ns][e + 1] + 1LL * (2 - e) * dp[pv][j][s][e]) % MOD;
          if (e + 1 <= 2)
            dp[nx][j + 1][ns][e + 1] = (dp[nx][j + 1][ns][e + 1] + 1LL * (2 - e) * dp[pv][j][s][e]) % MOD;
        }
      }
    }
    memset(dp[pv], 0, sizeof(dp[pv]));
  }

  int ans = 0;
  for (int i = 0; i <= l; ++i)
    ans = (ans + dp[n & 1][0][i][2]) % MOD;

  printf("%d\n", ans);

  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:19:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   19 |     scanf("%d", &a[i]);
      |     ~~~~~^~~~~~~~~~~~~

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 1516 KB Output is correct
3 Correct 2 ms 2796 KB Output is correct
4 Correct 2 ms 2796 KB Output is correct
5 Correct 3 ms 2796 KB Output is correct
6 Correct 3 ms 2796 KB Output is correct
7 Correct 2 ms 2796 KB Output is correct
8 Correct 2 ms 2796 KB Output is correct
9 Correct 3 ms 2796 KB Output is correct
10 Correct 2 ms 2796 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2796 KB Output is correct
2 Correct 3 ms 2796 KB Output is correct
3 Correct 2 ms 2796 KB Output is correct
4 Correct 3 ms 2796 KB Output is correct
5 Correct 3 ms 2796 KB Output is correct
6 Correct 3 ms 2796 KB Output is correct
7 Correct 3 ms 2796 KB Output is correct
8 Correct 2 ms 2796 KB Output is correct
9 Correct 3 ms 2816 KB Output is correct
10 Correct 3 ms 2796 KB Output is correct

Subtask #3
80.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 1516 KB Output is correct
3 Correct 2 ms 2796 KB Output is correct
4 Correct 2 ms 2796 KB Output is correct
5 Correct 3 ms 2796 KB Output is correct
6 Correct 3 ms 2796 KB Output is correct
7 Correct 2 ms 2796 KB Output is correct
8 Correct 2 ms 2796 KB Output is correct
9 Correct 3 ms 2796 KB Output is correct
10 Correct 2 ms 2796 KB Output is correct
11 Correct 2 ms 2796 KB Output is correct
12 Correct 3 ms 2796 KB Output is correct
13 Correct 2 ms 2796 KB Output is correct
14 Correct 3 ms 2796 KB Output is correct
15 Correct 3 ms 2796 KB Output is correct
16 Correct 3 ms 2796 KB Output is correct
17 Correct 3 ms 2796 KB Output is correct
18 Correct 2 ms 2796 KB Output is correct
19 Correct 3 ms 2816 KB Output is correct
20 Correct 3 ms 2796 KB Output is correct
21 Correct 4 ms 2796 KB Output is correct
22 Correct 79 ms 2796 KB Output is correct
23 Correct 97 ms 2796 KB Output is correct
24 Correct 86 ms 2924 KB Output is correct
25 Correct 106 ms 2796 KB Output is correct
26 Correct 86 ms 2796 KB Output is correct
27 Correct 36 ms 2924 KB Output is correct
28 Correct 44 ms 2796 KB Output is correct
29 Correct 79 ms 2924 KB Output is correct
30 Correct 101 ms 2924 KB Output is correct