oj.uz

Submission #369569

# Submission time Handle Problem Language Result Execution time Memory
369569 2021-02-21T22:20:33 Z solaimanope Skyscraper (JOI16_skyscraper) C++17
100 / 100
 358 ms 167076 KB 
#include<bits/stdc++.h>
using namespace std;
const int MOD = 1e9+7;

int sum(int a, int b) {
    return a + b >= MOD ? a + b - MOD : a + b;
}
void sumi(int &a, int b) {
    a = sum(a, b);
}
int sub(int a, int b) {
    return a - b < 0 ? a - b + MOD : a - b;
}
int mul(int a, int b) {
    return (1LL*a*b)%MOD;
}

const int MAXN = 103, MAXL = 1003;
int ar[MAXN];

int dp[MAXN][MAXN][2][2][MAXL];
int n, l;

int solve(int ps, int open, int bam, int dan, int x) {
    if (x > l) return 0;
    assert(x >= 0);
    if (ps == n) {
        if (open == 1) return bam ^ dan;
        if (open == 2) return bam & dan;
        return 0;
    }

    int &ans = dp[ps][open][bam][dan][x];
    if (ans != -1) return ans;
    ans = 0;

    int y = open*2-bam-dan;
    int z = ar[ps+1]-ar[ps];

    ///single comp inside
    sumi(ans, solve(ps+1, open+1, bam, dan, x+y*z+2*z));

    ///single comp border
    if (!bam) sumi(ans, solve(ps+1, open+1, 1, dan, x+y*z+z));
    if (!dan) sumi(ans, solve(ps+1, open+1, bam, 1, x+y*z+z));

    ///extend one side of a comp inside
    if (open > 0) sumi(ans, mul(open*2-bam-dan, solve(ps+1, open, bam, dan, x+y*z)));

    ///extend one side of a comp border
    if (!bam && open > dan) sumi(ans, mul(open-dan, solve(ps+1, open, 1, dan, x+y*z-z)));
    if (!dan && open > bam) sumi(ans, mul(open-bam, solve(ps+1, open, bam, 1, x+y*z-z)));

    ///glue two comps
    if (open >= 2) {
        int ways = (open-dan)*(open-bam)-bam*dan-(open-bam-dan);
        if (ways > 0) sumi(ans, mul(ways, solve(ps+1, open-1, bam, dan, x+y*z-2*z)));
    }

    return ans;
}

int main() {
    cin >> n >> l;

    for (int i = 1; i <= n; i++) cin >> ar[i];
    sort(ar+1, ar+n+1);

    ///handle n == 1
    if (n == 1) {
        cout << 1 << endl;
        return 0;
    }

    memset(dp, -1, sizeof dp);
    cout << solve(1, 0, 0, 0, 0) << endl;

    return 0;
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 82 ms 166912 KB Output is correct
3 Correct 85 ms 166860 KB Output is correct
4 Correct 81 ms 166892 KB Output is correct
5 Correct 83 ms 166892 KB Output is correct
6 Correct 82 ms 166892 KB Output is correct
7 Correct 81 ms 166892 KB Output is correct
8 Correct 83 ms 166892 KB Output is correct
9 Correct 83 ms 166892 KB Output is correct
10 Correct 81 ms 167020 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 82 ms 167020 KB Output is correct
2 Correct 82 ms 166892 KB Output is correct
3 Correct 82 ms 166892 KB Output is correct
4 Correct 83 ms 166892 KB Output is correct
5 Correct 84 ms 166892 KB Output is correct
6 Correct 83 ms 166892 KB Output is correct
7 Correct 83 ms 166892 KB Output is correct
8 Correct 84 ms 167020 KB Output is correct
9 Correct 90 ms 167020 KB Output is correct
10 Correct 84 ms 167040 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 82 ms 166912 KB Output is correct
3 Correct 85 ms 166860 KB Output is correct
4 Correct 81 ms 166892 KB Output is correct
5 Correct 83 ms 166892 KB Output is correct
6 Correct 82 ms 166892 KB Output is correct
7 Correct 81 ms 166892 KB Output is correct
8 Correct 83 ms 166892 KB Output is correct
9 Correct 83 ms 166892 KB Output is correct
10 Correct 81 ms 167020 KB Output is correct
11 Correct 82 ms 167020 KB Output is correct
12 Correct 82 ms 166892 KB Output is correct
13 Correct 82 ms 166892 KB Output is correct
14 Correct 83 ms 166892 KB Output is correct
15 Correct 84 ms 166892 KB Output is correct
16 Correct 83 ms 166892 KB Output is correct
17 Correct 83 ms 166892 KB Output is correct
18 Correct 84 ms 167020 KB Output is correct
19 Correct 90 ms 167020 KB Output is correct
20 Correct 84 ms 167040 KB Output is correct
21 Correct 82 ms 166892 KB Output is correct
22 Correct 358 ms 166892 KB Output is correct
23 Correct 118 ms 167020 KB Output is correct
24 Correct 152 ms 166892 KB Output is correct
25 Correct 129 ms 166892 KB Output is correct
26 Correct 125 ms 166892 KB Output is correct
27 Correct 129 ms 166892 KB Output is correct
28 Correct 155 ms 166892 KB Output is correct
29 Correct 215 ms 166892 KB Output is correct
30 Correct 125 ms 167076 KB Output is correct