oj.uz

Submission #678327

# Submission time Handle Problem Language Result Execution time Memory
678327 2023-01-05T13:13:24 Z stevancv Skyscraper (JOI16_skyscraper) C++14
100 / 100
 154 ms 2668 KB 
#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define sp ' '
#define en '\n'
#define smin(a, b) a = min(a, b)
#define smax(a, b) a = max(a, b)
#define sadd(a, b) a = Add(a, b)
#define smul(a, b) a = Mul(a, b)
using namespace std;
const int N = 100 + 2;
const int M = 1000 + 2;
const int mod = 1e9 + 7;
int Add(int a, int b) {
    a += b;
    while (a >= mod) a -= mod;
    while (a < 0) a += mod;
    return a;
}
int Mul(int a, int b) {
    ll c = a; c *= b; c %= mod;
    return c;
}
int dp[N][M][3], odp[N][M][3], a[N];
int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int n, l;
    cin >> n >> l;
    for (int i = 1; i <= n; i++) cin >> a[i];
    if (n == 1) {
        cout << 1 << en;
        return 0;
    }
    sort(a + 1, a + n + 1);
    if (a[2] - a[1] <= l) dp[1][a[2] - a[1]][1] = 2;
    if (2 * (a[2] - a[1]) <= l) dp[1][2 * (a[2] - a[1])][0] = 1;
    for (int i = 2; i <= n; i++) {
        int diff = a[i + 1] - a[i];
        if (i == n) diff = 0;
        for (int j = 1; j <= i; j++) {
            for (int s = 0; s <= l; s++) {
                for (int e = 0; e < 3; e++) {
                    odp[j][s][e] = dp[j][s][e];
                    dp[j][s][e] = 0;
                }
            }
        }
        for (int j = 1; j <= i; j++) {
            for (int s = 0; s <= l; s++) {
                for (int e = 0; e < 3; e++) {
                    int kol = 2 * j - e;
                    if (s < diff * kol) continue;
                    sadd(dp[j][s][e], Mul(j - e, odp[j - 1][s - diff * kol][e]));
                    sadd(dp[j][s][e], Mul(2 * j - e, odp[j][s - diff * kol][e]));
                    sadd(dp[j][s][e], Mul(j, odp[j + 1][s - diff * kol][e]));
                    if (e == 0) continue;
                    sadd(dp[j][s][e], Mul(3 - e, odp[j - 1][s - diff * kol][e - 1]));
                    sadd(dp[j][s][e], Mul(3 - e, odp[j][s - diff * kol][e - 1]));
                }
            }
        }
    }
    int ans = 0;
    for (int s = 0; s <= l; s++) sadd(ans, dp[1][s][2]);
    cout << ans << en;
    return 0;
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 2 ms 468 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 2 ms 468 KB Output is correct
10 Correct 0 ms 340 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct

Subtask #3
80.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 2 ms 468 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 2 ms 468 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 1 ms 340 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 468 KB Output is correct
15 Correct 1 ms 468 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 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 596 KB Output is correct
22 Correct 154 ms 2128 KB Output is correct
23 Correct 153 ms 2660 KB Output is correct
24 Correct 132 ms 2600 KB Output is correct
25 Correct 141 ms 2668 KB Output is correct
26 Correct 142 ms 2640 KB Output is correct
27 Correct 55 ms 1600 KB Output is correct
28 Correct 59 ms 1756 KB Output is correct
29 Correct 111 ms 2428 KB Output is correct
30 Correct 131 ms 2560 KB Output is correct