Submission #998593

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
998593	2024-06-14T09:56:51 Z	doducanh	Sailing Race (CEOI12_race)	C++14	100 / 100	850 ms	5572 KB

race

#include<bits/stdc++.h>
using namespace std;
#define fi first
#define se second
int edge[505][505];
int dp[505][505][2];
int dp1[505][505][2];
int nx[505][2];
int n,type;
void solve(int l,int r,int x)
{
    if(edge[l][r]){
        dp[l][r][x]=1;
        dp1[l][r][x]=1+dp1[r][nx[l][x]][x^1];
    }
    else{
        dp[l][r][x]=-n;
        dp1[l][r][x]=-n;
    }
    for(int m=nx[l][x];m!=r;m=nx[m][x]){
        dp[l][r][x]=max(dp[l][r][x],dp[l][m][x]+dp[m][r][x]);
        dp1[l][r][x]=max(dp1[l][r][x],dp[l][m][x]+dp1[m][r][x]);
    }
    dp1[l][r][x]=max(dp1[l][r][x],dp1[l][nx[r][x^1]][x]);
}
main()
{
    cin>>n>>type;
    for(int i=0;i<n;i++){
        int x;
        cin>>x;
        while(x!=0){
            edge[i][x-1]=1;
            cin>>x;
        }
        nx[i][0]=(i+1)%n;
        nx[i][1]=(i+n-1)%n;
    }
    for(int d=1;d<n;d++){
        for(int l=0,r=(l+d)%n;l<n;l++,r=nx[r][0]){
            solve(l,r,0);
            solve(r,l,1);
        }
    }
    pair<int,int>ans={-1,0};
    for(int l=0;l<n;l++){
        for(int r=0;r<n;r++){
            for(int x=0;x<2;x++){
                ans=max(ans,{dp1[l][r][x],l+1});
            }
        }
    }
    if(type){
        for(int l=0;l<n;l++){
            for(int r=0;r<n;r++){
                for(int x=0;x<2;x++){
                    if(dp[l][r][x]<=0)continue;
                    int st=nx[r][x];
                    while(st!=l&&edge[st][l]==0)st=nx[st][x];
                    if(st==l)continue;
                    for(int ed=nx[st][x];ed!=l;ed=nx[ed][x]){
                        if(edge[r][ed]){
                            ans=max(ans,make_pair(max(dp1[ed][nx[l][x^1]][x],dp1[ed][nx[st][x]][x^1])+1+1+dp[l][r][x],st+1));
                        }
                    }
                }
            }
        }
    }
    cout<<ans.fi<<"\n"<<ans.se;
}

Compilation message

race.cpp:26:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   26 | main()
      | ^~~~

Subtask #1

100.0 / 100.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	4444 KB	Output is correct
2	Correct	1 ms	4444 KB	Output is correct
3	Correct	1 ms	4444 KB	Output is correct
4	Correct	1 ms	4700 KB	Output is correct
5	Correct	1 ms	4700 KB	Output is correct
6	Correct	2 ms	4700 KB	Output is correct
7	Correct	2 ms	4700 KB	Output is correct
8	Correct	3 ms	4700 KB	Output is correct
9	Correct	3 ms	4696 KB	Output is correct
10	Correct	5 ms	4700 KB	Output is correct
11	Correct	4 ms	4700 KB	Output is correct
12	Correct	57 ms	4812 KB	Output is correct
13	Correct	157 ms	5028 KB	Output is correct
14	Correct	196 ms	5208 KB	Output is correct
15	Correct	776 ms	5468 KB	Output is correct
16	Correct	834 ms	5468 KB	Output is correct
17	Correct	758 ms	5508 KB	Output is correct
18	Correct	377 ms	5440 KB	Output is correct
19	Correct	850 ms	5564 KB	Output is correct
20	Correct	837 ms	5572 KB	Output is correct