oj.uz

Submission #96535

# Submission time Handle Problem Language Result Execution time Memory
96535 2019-02-10T06:56:03 Z tichuot97 Skyscraper (JOI16_skyscraper) C++14
20 / 100
 291 ms 143864 KB 
#include <iostream>
#include <algorithm>
#include <cstring>
#include <time.h>
#include <set>

using namespace std;

const int maxN = 110, maxS = 1010, oo = 23041997, modP = 1e9 + 7;

int f[maxN][maxN][maxS][3], n, a[maxN], l;

int dp(int i, int cc, int s, int e) {
    if (s > l) return 0;
    if (i > n) return cc == 1 && e == 2;
    if (f[i][cc][s][e] != -1) return f[i][cc][s][e];
    int tmp = 0;
    int cost = s + (2 * cc - e) * (a[i] - a[i - 1]);
    // ** Add new component **
    // 1. Endpoints:
    if (e < 2) {
        tmp = (1ll * tmp + 1ll * dp(i + 1, cc + 1, cost, e + 1) * (2 - e)) % modP;
        // Merge new one with sth else immediately:
        if (i == n && cc == 1 && e == 1)
            tmp = (1ll * tmp + 1ll * dp(i + 1, cc, cost, e + 1)) % modP;
        else if (cc - e)
            tmp = (1ll * tmp + 1ll * dp(i + 1, cc, cost, e + 1) * (2 - e) * (cc - e)) % modP;
    }
    // 2. Middle:
    tmp = (tmp + dp(i + 1, cc + 1, cost, e)) % modP;
    // ** Add to existing component **
    // 1. Endpoints:
    if (e) tmp = (tmp + dp(i + 1, cc, cost, e) * e) % modP;
    // 2. Middle:
    //if (i == 3 && cc == 2 && s == 1 && e == 1) cout << "OK " << tmp << endl;
    if (cc - e) tmp = (1ll * tmp + 1ll * dp(i + 1, cc, cost, e) * (2 * (cc - e))) % modP;
    //if (i == 3 && cc == 2 && s == 1 && e == 1) cout << "OK " << tmp << endl;
    // ** Merge existing components **
    // 1. Endpoint with middle:
    if (e && cc - e)
        tmp = (1ll * tmp + 1ll * dp(i + 1, cc - 1, cost, e) * e * (cc - e)) % modP;
    // 2. Middle with middle:
    if (cc - e >= 2)
        tmp = (1ll * tmp + 1ll * dp(i + 1, cc - 1, cost, e) * (cc - e) * (cc - e - 1)) % modP;
    // 3. Endpoint with endpoint:
    if (e == 2 && cc == 2 && i == n)
        tmp = (1ll * tmp + 1ll * dp(i + 1, cc - 1, cost, e)) % modP;
    //cout << i << " " << cc << " " << s << " " << e << endl;
    //cout << tmp << endl;
    return f[i][cc][s][e] = tmp;
}

int main() {
    cin >> n >> l;
    /*srand(time(NULL));
    n = rand() % 10 + 1;
    l = rand() % 500 + 1;*/
    //cout << n << " " << l << endl;
    for (int i = 1; i <= n; ++i) scanf("%d", &a[i]);
    /*set < int > mset;
    for (int i = 1; i <= n; ++i) {
        a[i] = rand() % 100 + 1;
        while (mset.count(a[i])) a[i] = rand() % 100 + 1;
        mset.insert(a[i]);
        printf("%d ", a[i]);
    }
    cout << endl;*/
    if (n == 1) { cout << 1; return 0; }
    sort(a + 1, a + n + 1);
    memset(f, 255, sizeof(f));
    cout << dp(1, 0, 0, 0);
}

Compilation message

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:59:39: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for (int i = 1; i <= n; ++i) scanf("%d", &a[i]);
                                  ~~~~~^~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 97 ms 143864 KB Output is correct
3 Correct 95 ms 143736 KB Output is correct
4 Correct 95 ms 143736 KB Output is correct
5 Correct 95 ms 143864 KB Output is correct
6 Correct 94 ms 143736 KB Output is correct
7 Correct 95 ms 143736 KB Output is correct
8 Correct 96 ms 143812 KB Output is correct
9 Correct 98 ms 143736 KB Output is correct
10 Correct 96 ms 143864 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 102 ms 143768 KB Output is correct
2 Correct 101 ms 143740 KB Output is correct
3 Correct 97 ms 143864 KB Output is correct
4 Correct 98 ms 143736 KB Output is correct
5 Correct 106 ms 143864 KB Output is correct
6 Correct 118 ms 143840 KB Output is correct
7 Correct 112 ms 143736 KB Output is correct
8 Correct 109 ms 143736 KB Output is correct
9 Correct 109 ms 143736 KB Output is correct
10 Correct 111 ms 143764 KB Output is correct

Subtask #3
0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 97 ms 143864 KB Output is correct
3 Correct 95 ms 143736 KB Output is correct
4 Correct 95 ms 143736 KB Output is correct
5 Correct 95 ms 143864 KB Output is correct
6 Correct 94 ms 143736 KB Output is correct
7 Correct 95 ms 143736 KB Output is correct
8 Correct 96 ms 143812 KB Output is correct
9 Correct 98 ms 143736 KB Output is correct
10 Correct 96 ms 143864 KB Output is correct
11 Correct 102 ms 143768 KB Output is correct
12 Correct 101 ms 143740 KB Output is correct
13 Correct 97 ms 143864 KB Output is correct
14 Correct 98 ms 143736 KB Output is correct
15 Correct 106 ms 143864 KB Output is correct
16 Correct 118 ms 143840 KB Output is correct
17 Correct 112 ms 143736 KB Output is correct
18 Correct 109 ms 143736 KB Output is correct
19 Correct 109 ms 143736 KB Output is correct
20 Correct 111 ms 143764 KB Output is correct
21 Correct 118 ms 143840 KB Output is correct
22 Incorrect 291 ms 143744 KB Output isn't correct
23 Halted 0 ms 0 KB -