oj.uz

Submission #528084

# Submission time Handle Problem Language Result Execution time Memory
528084 2022-02-19T07:21:51 Z tht2005 Skyscraper (JOI16_skyscraper) C++17
100 / 100
 69 ms 16600 KB 
#include <bits/stdc++.h>

using namespace std;

const int md = (int)1e9 + 7;
void add(int& a, int b) {
    a += b;
    if(a >= md) a -= md;
}
int mul(int a, int b) {
    return (long long)a * b % md;
}

const int N = 102;
const int M = 1003;
int n, m, res, a[N], f[N][N][M][3];

int main() {
    scanf("%d %d", &n, &m);
    for(int i = 0; i < n; ++i)
        scanf("%d", a + i);
    sort(a, a + n);
    if(n == 1) {
        putchar('1');
    }
    else {
        f[0][1][0][0] = 1;
        f[0][1][0][1] = 2;
        for(int i = 0; i + 1 < n; ++i)
            for(int j = 1; j <= n; ++j)
                for(int k = 0; k <= m; ++k)
                    for(int l = 0; l < 3; ++l) {
                        int ft = f[i][j][k][l];
                        if(ft == 0) continue;
                        int nk = k + (2 * j - l) * (a[i + 1] - a[i]);
                        if(nk > m) continue;
                        add(f[i + 1][j + 1][nk][l], mul(ft, j + 1 - l));
                        if(l < 2) add(f[i + 1][j + 1][nk][l + 1], mul(ft, 2 - l));
                        if(j != l || i + 2 == n) {
                            add(f[i + 1][j - 1][nk][l], mul(ft, j - 1));
                            if(l < 2) add(f[i + 1][j][nk][l + 1], mul(ft, 2 - l));
                        }
                        add(f[i + 1][j][nk][l], mul(ft, 2 * j - l));
                    }
        for(int i = 0; i <= m; ++i)
            add(res, f[n - 1][1][i][2]);
        printf("%d", res);
    }
    return 0;
}

Compilation message

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:19:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |     scanf("%d %d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~~
skyscraper.cpp:21:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   21 |         scanf("%d", a + i);
      |         ~~~~~^~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 300 KB Output is correct
4 Correct 0 ms 300 KB Output is correct
5 Correct 1 ms 428 KB Output is correct
6 Correct 1 ms 460 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 460 KB Output is correct
9 Correct 1 ms 460 KB Output is correct
10 Correct 1 ms 432 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 588 KB Output is correct
2 Correct 1 ms 588 KB Output is correct
3 Correct 1 ms 620 KB Output is correct
4 Correct 1 ms 460 KB Output is correct
5 Correct 1 ms 460 KB Output is correct
6 Correct 1 ms 588 KB Output is correct
7 Correct 1 ms 424 KB Output is correct
8 Correct 1 ms 676 KB Output is correct
9 Correct 1 ms 716 KB Output is correct
10 Correct 1 ms 588 KB Output is correct

Subtask #3
80.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 300 KB Output is correct
4 Correct 0 ms 300 KB Output is correct
5 Correct 1 ms 428 KB Output is correct
6 Correct 1 ms 460 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 460 KB Output is correct
9 Correct 1 ms 460 KB Output is correct
10 Correct 1 ms 432 KB Output is correct
11 Correct 1 ms 588 KB Output is correct
12 Correct 1 ms 588 KB Output is correct
13 Correct 1 ms 620 KB Output is correct
14 Correct 1 ms 460 KB Output is correct
15 Correct 1 ms 460 KB Output is correct
16 Correct 1 ms 588 KB Output is correct
17 Correct 1 ms 424 KB Output is correct
18 Correct 1 ms 676 KB Output is correct
19 Correct 1 ms 716 KB Output is correct
20 Correct 1 ms 588 KB Output is correct
21 Correct 2 ms 1228 KB Output is correct
22 Correct 69 ms 16600 KB Output is correct
23 Correct 53 ms 6520 KB Output is correct
24 Correct 50 ms 9544 KB Output is correct
25 Correct 52 ms 7364 KB Output is correct
26 Correct 47 ms 6920 KB Output is correct
27 Correct 26 ms 8644 KB Output is correct
28 Correct 31 ms 10252 KB Output is correct
29 Correct 52 ms 12740 KB Output is correct
30 Correct 57 ms 7316 KB Output is correct