Submission #487099

#	Time	Username	Problem	Language	Result	Execution time	Memory
487099		stefantaga	Skyscraper (JOI16_skyscraper)	C++14	15 / 100	2 ms	1100 KiB

skyscraper

#include <bits/stdc++.h>
#define MOD 1000000007
using namespace std;
int v[105];
int din[105][105][1005][2][2],n,l,i,j,sum,S,F;
int main()
{
    ios_base :: sync_with_stdio(false);
    cin.tie(0);
    #ifdef HOME
    ifstream cin("date.in");
    ofstream cout("date.out");
    #endif // HOME
    cin>>n>>l;
    for (i=1;i<=n;i++)
    {
        cin>>v[i];
    }
    sort (v+1,v+n+1);
    /// starile initiale
    din[1][0][0][1][1] = din[1][0][0][0][1] = din[1][0][0][1][0] = din[1][0][0][0][0] = 1;
    for (i=1;i<n;i++)
    {
        for (j=0;j<=n;j++)
        {
            for (sum=0;sum<=l;sum++)
            {
                for (S=0;S<=1;S++)
                {
                    for (F=0;F<=1;F++)
                    {
                        int nou_sum=sum+(v[i+1]-v[i])*(2*j+F+S);
                        if (din[i][j][sum][S][F]==0)
                        {
                            continue;
                        }
                        if (j-1>=0)
                        {
                            din[i+1][j-1][nou_sum][S][F]=(din[i+1][j-1][nou_sum][S][F]+(1LL*din[i][j][sum][S][F]*j)%MOD)%MOD;
                        }
                        din[i+1][j][nou_sum][S][F]=(din[i+1][j][nou_sum][S][F]+(din[i][j][sum][S][F]*j*2)%MOD)%MOD;
                        din[i+1][j+1][nou_sum][S][F]=(din[i+1][j+1][nou_sum][S][F]+(din[i][j][sum][S][F]*j)%MOD)%MOD;
                        if (S==1)
                        {
                            din[i+1][j+1][nou_sum][0][F]=(din[i+1][j+1][nou_sum][0][F]+din[i][j][sum][S][F])%MOD;
                            din[i+1][j+1][nou_sum][1][F]=(din[i+1][j+1][nou_sum][1][F]+din[i][j][sum][S][F])%MOD;
                            din[i+1][j][nou_sum][0][F]=(din[i+1][j][nou_sum][0][F]+din[i][j][sum][S][F])%MOD;
                            din[i+1][j][nou_sum][1][F]=(din[i+1][j][nou_sum][1][F]+din[i][j][sum][S][F])%MOD;
                        }
                        if (F==1)
                        {
                            din[i+1][j+1][nou_sum][S][0]=(din[i+1][j+1][nou_sum][S][0]+din[i][j][sum][S][F])%MOD;
                            din[i+1][j+1][nou_sum][S][1]=(din[i+1][j+1][nou_sum][S][1]+din[i][j][sum][S][F])%MOD;
                            din[i+1][j][nou_sum][S][0]=(din[i+1][j][nou_sum][S][0]+din[i][j][sum][S][F])%MOD;
                            din[i+1][j][nou_sum][S][1]=(din[i+1][j][nou_sum][S][1]+din[i][j][sum][S][F])%MOD;
                        }
                    }
                }
            }
        }
    }
    long long solfin=0;
    for (sum=0;sum<=l;sum++)
    {
        solfin=(solfin+din[n][0][sum][0][0])%MOD;
    }
    cout<<solfin;
    return 0;
}

• Subtask 1: 0 / 5
• Subtask 2: 15 / 15
• Subtask 3: 0 / 80