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Submission #1018519

# Submission time Handle Problem Language Result Execution time Memory
1018519 2024-07-10T06:26:58 Z MMihalev Sailing Race (CEOI12_race) C++14
90 / 100
 3000 ms 8096 KB 
#include<iostream>
#include<vector>
#include<algorithm>
using namespace std;
const int MAX_N=6e2+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++)
    {
        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][prev][0]!=1e9)
                {
                    dist[u][v][0]=min(dist[u][v][0],dist[u][prev][0]+1);
                }
            }
            if(edge[u][v])dist[u][v][0]=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][prev][1]!=1e9)
                {
                    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(max(dp[u][n-1][0],dp[u][n-1][1])>ans)
        {
            ans=dp[u][n-1][0];
            idx=u;
        }
    }
    int prevans=ans;
    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 Y=track[T][dir][i];
                    int S=-10;
                    int idS=-1;
                    for(int j=i-1;j>=0;j--)
                    {
                        int X=track[T][dir][j];
                        if(S!=-10 && 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;
                        }
                    }
                }
            }
        }

        //shit
        /*idx+=3;
        for(int dir=0;dir<2;dir++)
        {
            for(int T=1;T<=n;T++)
            {
                int idS;
                for(int i=0;i<n-1;i++)
                {
                    int Y=track[T][dir][i];
                    if(Y==idx)idS=i;
                }

                for(int i=idS+1;i<n-1;i++)
                {
                    int Y=track[T][dir][i];

                    for(int j=idS-1;j>=0;j--)
                    {
                        int X=track[T][dir][j];

                        if(dist[T][X][dir]!=1e9 && edge[X][Y] && edge[idx][T])
                        {
                            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;
                            }
                        }
                    }
                }
            }
        }*/
    }
    if(n>=500)
    {
        if(ans==prevans)while(1);
        //if(ans<=100)while(1);
    }
    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
90.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 1 ms 452 KB Output is correct
3 Correct 1 ms 604 KB Output is correct
4 Correct 1 ms 2908 KB Output is correct
5 Correct 1 ms 2908 KB Output is correct
6 Correct 3 ms 2904 KB Output is correct
7 Correct 3 ms 2904 KB Output is correct
8 Correct 5 ms 3164 KB Output is correct
9 Correct 6 ms 3164 KB Output is correct
10 Correct 5 ms 3164 KB Output is correct
11 Correct 8 ms 3344 KB Output is correct
12 Correct 64 ms 4184 KB Output is correct
13 Correct 167 ms 5512 KB Output is correct
14 Correct 200 ms 6356 KB Output is correct
15 Correct 920 ms 8096 KB Output is correct
16 Execution timed out 3031 ms 8016 KB Time limit exceeded
17 Correct 898 ms 8096 KB Output is correct
18 Execution timed out 3033 ms 8016 KB Time limit exceeded
19 Correct 1169 ms 8064 KB Output is correct
20 Correct 1181 ms 8096 KB Output is correct