oj.uz

Submission #772195

# Submission time Handle Problem Language Result Execution time Memory
772195 2023-07-03T18:00:03 Z ttamx Skyscraper (JOI16_skyscraper) C++14
100 / 100
 183 ms 173772 KB 
#include<bits/stdc++.h>

using namespace std;

typedef long long ll;

const int N=105;
const int M=1005;
const int mod=1e9+7;

struct mint{
    int x;
    mint(ll x=0ll):x(x%mod){}
    void upd(){
        if(x>=mod)x-=mod;
        if(x<0)x+=mod;
    }
    mint& operator+=(mint rhs){return x+=rhs.x,upd(),*this;}
    mint& operator-=(mint rhs){return x-=rhs.x,upd(),*this;}
    mint& operator*=(mint rhs){return x=(1ll*x*rhs.x)%mod,*this;}
    friend mint operator+(mint lhs,mint rhs){return lhs+=rhs;};
    friend mint operator-(mint lhs,mint rhs){return lhs-=rhs;};
    friend mint operator*(mint lhs,mint rhs){return lhs*=rhs;};
};

int n,l;
int a[N];
mint dp[N][N][M][4];
mint ans;

int main(){
    cin.tie(nullptr)->sync_with_stdio(false);
    cin >> n >> l;
    for(int i=1;i<=n;i++)cin >> a[i];
    if(n==1)cout << 1,exit(0);
    sort(a+1,a+n+1);
    dp[1][1][0][0]=1;
    dp[1][1][0][1]=2;
    for(int i=2;i<=n;i++){
        for(int j=1;j<i;j++){
            for(int k=0;k<=l;k++){
                for(int e=0;e<3;e++){
                    int res=k+(a[i]-a[i-1])*(2*j-e);
                    if(res>l)continue;
                    dp[i][j-1][res][e]+=dp[i-1][j][k][e]*(j-1);
                    dp[i][j][res][e]+=dp[i-1][j][k][e]*(2*j-e);
                    dp[i][j+1][res][e]+=dp[i-1][j][k][e]*(j+1-e);
                    dp[i][j][res][e+1]+=dp[i-1][j][k][e]*(2-e);
                    dp[i][j+1][res][e+1]+=dp[i-1][j][k][e]*(2-e);
                }
            }
        }
    }
    for(int i=0;i<=l;i++)ans+=dp[n][1][i][2];
    cout << ans.x;
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 68 ms 173708 KB Output is correct
2 Correct 69 ms 173692 KB Output is correct
3 Correct 68 ms 173700 KB Output is correct
4 Correct 67 ms 173752 KB Output is correct
5 Correct 68 ms 173668 KB Output is correct
6 Correct 76 ms 173676 KB Output is correct
7 Correct 69 ms 173728 KB Output is correct
8 Correct 76 ms 173644 KB Output is correct
9 Correct 71 ms 173652 KB Output is correct
10 Correct 73 ms 173652 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 67 ms 173656 KB Output is correct
2 Correct 69 ms 173648 KB Output is correct
3 Correct 68 ms 173684 KB Output is correct
4 Correct 75 ms 173692 KB Output is correct
5 Correct 68 ms 173764 KB Output is correct
6 Correct 68 ms 173644 KB Output is correct
7 Correct 69 ms 173700 KB Output is correct
8 Correct 80 ms 173756 KB Output is correct
9 Correct 68 ms 173752 KB Output is correct
10 Correct 68 ms 173664 KB Output is correct

Subtask #3
80.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 68 ms 173708 KB Output is correct
2 Correct 69 ms 173692 KB Output is correct
3 Correct 68 ms 173700 KB Output is correct
4 Correct 67 ms 173752 KB Output is correct
5 Correct 68 ms 173668 KB Output is correct
6 Correct 76 ms 173676 KB Output is correct
7 Correct 69 ms 173728 KB Output is correct
8 Correct 76 ms 173644 KB Output is correct
9 Correct 71 ms 173652 KB Output is correct
10 Correct 73 ms 173652 KB Output is correct
11 Correct 67 ms 173656 KB Output is correct
12 Correct 69 ms 173648 KB Output is correct
13 Correct 68 ms 173684 KB Output is correct
14 Correct 75 ms 173692 KB Output is correct
15 Correct 68 ms 173764 KB Output is correct
16 Correct 68 ms 173644 KB Output is correct
17 Correct 69 ms 173700 KB Output is correct
18 Correct 80 ms 173756 KB Output is correct
19 Correct 68 ms 173752 KB Output is correct
20 Correct 68 ms 173664 KB Output is correct
21 Correct 72 ms 173756 KB Output is correct
22 Correct 177 ms 173724 KB Output is correct
23 Correct 174 ms 173652 KB Output is correct
24 Correct 171 ms 173712 KB Output is correct
25 Correct 183 ms 173764 KB Output is correct
26 Correct 163 ms 173764 KB Output is correct
27 Correct 108 ms 173676 KB Output is correct
28 Correct 122 ms 173644 KB Output is correct
29 Correct 174 ms 173772 KB Output is correct
30 Correct 179 ms 173696 KB Output is correct