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Submission #1018530

# Submission time Handle Problem Language Result Execution time Memory
1018530 2024-07-10T06:32:35 Z MMihalev Sailing Race (CEOI12_race) C++14
40 / 100
 682 ms 8276 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++)
            {
                dp[u][used][dir]=dp[u][used-1][dir];
                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=-1;
    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;
    cout<<ans<<"\n";
    cout<<idx<<"\n";
    return;
    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;
                        }
                    }
                }
            }
        }
    }
    if(n>=500)
    {

    }
    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;
}

Compilation message

race.cpp: In function 'void solve()':
race.cpp:123:9: warning: unused variable 'prevans' [-Wunused-variable]
  123 |     int prevans=ans;
      |         ^~~~~~~

Subtask #1
40.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Incorrect 0 ms 604 KB Output isn't correct
3 Incorrect 0 ms 604 KB Output isn't correct
4 Incorrect 1 ms 2904 KB Output isn't correct
5 Correct 2 ms 2904 KB Output is correct
6 Incorrect 2 ms 2908 KB Output isn't correct
7 Correct 3 ms 3164 KB Output is correct
8 Incorrect 3 ms 3164 KB Output isn't correct
9 Correct 5 ms 3192 KB Output is correct
10 Correct 8 ms 3160 KB Output is correct
11 Correct 8 ms 3160 KB Output is correct
12 Incorrect 38 ms 4188 KB Output isn't correct
13 Incorrect 95 ms 5540 KB Output isn't correct
14 Correct 197 ms 6480 KB Output is correct
15 Incorrect 516 ms 7844 KB Output isn't correct
16 Incorrect 590 ms 8020 KB Output isn't correct
17 Incorrect 500 ms 8024 KB Output isn't correct
18 Correct 351 ms 8276 KB Output is correct
19 Incorrect 682 ms 8044 KB Output isn't correct
20 Incorrect 675 ms 8104 KB Output isn't correct