Submission #1285393

#	Time	Username	Problem	Language	Result	Execution time	Memory
1285393		MMihalev	Longest Trip (IOI23_longesttrip)	C++20	0 / 100	1076 ms	436 KiB

longesttrip

#include<iostream>
#include<algorithm>
#include<vector>
#include<queue>
#include<random>
#include "longesttrip.h"
using namespace std;
mt19937 rng(87645);
vector<int>ans;
int n;
int cntqueries=0;
bool edge(int u,int v)
{
    cntqueries++;
    return are_connected({u},{v});
}
std::vector<int> longest_trip(int N, int D)
{
    cntqueries=0;
    n=N;
    ans.clear();
    ///reset eveerything
    vector<int>v1,v2;

    v1.push_back(0);v2.push_back(1);
    vector<int>nodes;
    for(int i=2;i<n;i++)nodes.push_back(i);
    shuffle(nodes.begin(),nodes.end(),rng);
    for(int i:nodes)
    {
        if(edge(i,v1.back()))v1.push_back(i);
        else if(edge(i,v2.back()))v2.push_back(i);
        else
        {
            vector<int>tmp=v1;
            reverse(v2.begin(),v2.end());
            for(int x:v2)tmp.push_back(x);
            v1=tmp;
            v2.clear();v2.push_back(i);
        }
    }
    if(cntqueries>450)while(1);
    if(v1.size()>v2.size())ans=v1;
    else ans=v2;
    return ans;
}

• Subtask 0: 0 / 0
• Subtask 1: 0 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 25
• Subtask 4: 0 / 60