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답안 #1017305

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1017305 2024-07-09T07:19:10 Z MMihalev Sailing Race (CEOI12_race) C++14
95 / 100
 1248 ms 6740 KB 
#include<iostream>
#include<vector>
#include<algorithm>
using namespace std;
const int MAX_N=5e2+10;
//0 clockwise
//1 counterclockwise
vector<int>track[MAX_N][2];//0 - ; 1 +
int n;
bool edge[MAX_N][MAX_N];
int type;
int dp[MAX_N][MAX_N][2];
int dist[MAX_N][MAX_N][2];//0 - ; 1 +
void precompute()
{
    for(int i=1;i<=n;i++)
    {
        for(int j=i+1;j<=n;j++)
        {
            track[i][0].push_back(j);
        }
        for(int j=1;j<i;j++)
        {
            track[i][0].push_back(j);
        }
        //0

        for(int j=i-1;j>=1;j--)
        {
            track[i][1].push_back(j);
        }
        for(int j=n;j>i;j--)
        {
            track[i][1].push_back(j);
        }
        //1
    }
    ///track


    for(int u=1;u<=n;u++)
    {
        dist[u][u][0]=0;
        for(int j=0;j<n-1;j++)
        {
            int v=track[u][0][j];
            dist[u][v][0]=1e9;
            for(int r=0;r<j;r++)
            {
                int prev=track[u][0][r];
                if(edge[prev][v])
                {
                    dist[u][v][0]=min(dist[u][v][0],dist[u][prev][0]+1);
                }
            }
            if(edge[u][v])dist[u][v][0]=1;
        }
        //0

        dist[u][u][1]=0;
        for(int j=0;j<n-1;j++)
        {
            int v=track[u][1][j];
            dist[u][v][1]=1e9;
            for(int r=0;r<j;r++)
            {
                int prev=track[u][1][r];
                if(edge[prev][v])
                {
                    dist[u][v][1]=min(dist[u][v][1],dist[u][prev][1]+1);
                }
            }
            if(edge[u][v])dist[u][v][1]=1;
        }
        //1
    }
    ///dist

    for(int used=1;used<n;used++)
    {
        for(int dir=0;dir<2;dir++)
        {
            for(int u=1;u<=n;u++)
            {
                for(int i=0;i<used;i++)
                {
                    int v=track[u][dir][i];
                    int pref=i;
                    int suf=used-1-i;

                    if(edge[u][v])dp[u][used][dir]=max(dp[u][used][dir],max(dp[v][suf][dir],dp[v][pref][1-dir])+1);
                }
            }
        }
    }
    ///dp
}
void read()
{
    cin>>n>>type;
    for(int u=1;u<=n;u++)
    {
        int v;
        cin>>v;
        while(v!=0)
        {
            edge[u][v]=1;
            cin>>v;
        }
    }
}
void solve()
{
    int ans=0;
    int idx=1;
    for(int u=1;u<=n;u++)
    {
        if(dp[u][n-1][0]>ans)
        {
            ans=dp[u][n-1][0];
            idx=u;
        }
    }
    if(type==1)
    {
        /*for(int dir=0;dir<2;dir++)
        {
            for(int T=1;T<=n;T++)
            {
                for(int i=0;i<n-1;i++)
                {
                    int X=track[T][dir][i];
                    for(int j=i+1;j<n-1;j++)
                    {
                        int S=track[T][dir][j];
                        for(int r=j+1;r<n-1;r++)
                        {
                            int Y=track[T][dir][r];

                            if(edge[S][T] && edge[X][Y] && dist[T][X][dir]!=1e9)
                            {
                                int pref=r-j-1;
                                int suf=n-2-r;
                                int cur=1+dist[T][X][dir]+1+max(dp[Y][suf][dir],dp[Y][pref][1-dir]);
                                if(cur>ans)
                                {
                                    ans=cur;
                                    idx=S;
                                }
                            }
                        }
                    }
                }
            }
        }*/
        for(int dir=0;dir<2;dir++)
        {
            for(int T=1;T<=n;T++)
            {
                for(int i=0;i<n-1;i++)
                {
                    int Y=track[T][dir][i];
                    int S=-1;
                    int idS=-1;
                    for(int j=i-1;j>=0;j--)
                    {
                        int X=track[T][dir][j];
                        if(S!=-1 && dist[T][X][dir]!=1e9 && edge[X][Y])
                        {
                            int currer=1+dist[T][X][dir]+1+max(dp[Y][n-2-i][dir],dp[Y][i-idS-1][1-dir]);
                            if(currer>ans)
                            {
                                ans=currer;
                                idx=S;
                            }
                        }
                        if(edge[X][T])
                        {
                            S=X;
                            idS=j;
                        }
                    }
                }
            }
        }
    }
    cout<<ans<<"\n";
    cout<<idx<<"\n";
}
int main ()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);

    read();
    precompute();
    solve();
    return 0;
}

Subtask #1
95.0 / 100.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 1 ms 2652 KB Output is correct
3 Correct 1 ms 2652 KB Output is correct
4 Correct 1 ms 2652 KB Output is correct
5 Correct 1 ms 2908 KB Output is correct
6 Correct 3 ms 4700 KB Output is correct
7 Correct 3 ms 2908 KB Output is correct
8 Correct 4 ms 2908 KB Output is correct
9 Correct 5 ms 3188 KB Output is correct
10 Correct 5 ms 4700 KB Output is correct
11 Correct 7 ms 3236 KB Output is correct
12 Correct 65 ms 3920 KB Output is correct
13 Correct 199 ms 5976 KB Output is correct
14 Correct 197 ms 5452 KB Output is correct
15 Correct 942 ms 6740 KB Output is correct
16 Incorrect 1088 ms 6740 KB Output isn't correct
17 Correct 947 ms 6532 KB Output is correct
18 Correct 331 ms 6620 KB Output is correct
19 Correct 1248 ms 6736 KB Output is correct
20 Correct 1198 ms 6704 KB Output is correct