oj.uz

Submission #772210

# Submission time Handle Problem Language Result Execution time Memory
772210 2023-07-03T18:13:03 Z ttamx Skyscraper (JOI16_skyscraper) C++14
100 / 100
 183 ms 173768 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(calc(x%mod)){}
    int calc(int x){
        if(x>=mod)x-=mod;
        if(x<0)x+=mod;
        return x;
    }
    mint& operator+=(const mint &rhs){return x=calc(x+rhs.x),*this;}
    mint& operator-=(const mint &rhs){return x=calc(x-rhs.x),*this;}
    mint& operator*=(const mint &rhs){return x=(1ll*x*rhs.x)%mod,*this;}
    friend mint operator+(const mint &lhs,const mint &rhs){return mint(lhs)+=rhs;};
    friend mint operator-(const mint &lhs,const mint &rhs){return mint(lhs)-=rhs;};
    friend mint operator*(const mint &lhs,const mint &rhs){return mint(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 69 ms 173724 KB Output is correct
2 Correct 65 ms 173728 KB Output is correct
3 Correct 66 ms 173716 KB Output is correct
4 Correct 64 ms 173756 KB Output is correct
5 Correct 65 ms 173644 KB Output is correct
6 Correct 69 ms 173636 KB Output is correct
7 Correct 73 ms 173708 KB Output is correct
8 Correct 67 ms 173692 KB Output is correct
9 Correct 69 ms 173672 KB Output is correct
10 Correct 66 ms 173716 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 77 ms 173656 KB Output is correct
2 Correct 67 ms 173676 KB Output is correct
3 Correct 69 ms 173676 KB Output is correct
4 Correct 70 ms 173764 KB Output is correct
5 Correct 77 ms 173764 KB Output is correct
6 Correct 66 ms 173708 KB Output is correct
7 Correct 67 ms 173660 KB Output is correct
8 Correct 67 ms 173716 KB Output is correct
9 Correct 68 ms 173716 KB Output is correct
10 Correct 68 ms 173724 KB Output is correct

Subtask #3
80.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 69 ms 173724 KB Output is correct
2 Correct 65 ms 173728 KB Output is correct
3 Correct 66 ms 173716 KB Output is correct
4 Correct 64 ms 173756 KB Output is correct
5 Correct 65 ms 173644 KB Output is correct
6 Correct 69 ms 173636 KB Output is correct
7 Correct 73 ms 173708 KB Output is correct
8 Correct 67 ms 173692 KB Output is correct
9 Correct 69 ms 173672 KB Output is correct
10 Correct 66 ms 173716 KB Output is correct
11 Correct 77 ms 173656 KB Output is correct
12 Correct 67 ms 173676 KB Output is correct
13 Correct 69 ms 173676 KB Output is correct
14 Correct 70 ms 173764 KB Output is correct
15 Correct 77 ms 173764 KB Output is correct
16 Correct 66 ms 173708 KB Output is correct
17 Correct 67 ms 173660 KB Output is correct
18 Correct 67 ms 173716 KB Output is correct
19 Correct 68 ms 173716 KB Output is correct
20 Correct 68 ms 173724 KB Output is correct
21 Correct 67 ms 173724 KB Output is correct
22 Correct 179 ms 173660 KB Output is correct
23 Correct 180 ms 173700 KB Output is correct
24 Correct 183 ms 173760 KB Output is correct
25 Correct 181 ms 173764 KB Output is correct
26 Correct 164 ms 173720 KB Output is correct
27 Correct 107 ms 173708 KB Output is correct
28 Correct 120 ms 173760 KB Output is correct
29 Correct 168 ms 173768 KB Output is correct
30 Correct 180 ms 173672 KB Output is correct