Submission #966019

#	Time	Username	Problem	Language	Result	Execution time	Memory
966019		Darren0724	Fun Tour (APIO20_fun)	C++17	47 / 100	115 ms	111820 KiB

fun

#include "fun.h"
#include <bits/stdc++.h>
using namespace std;
#define all(x) x.begin(),x.end()
const int N=2000005;
int cntid=0;
const int INF=1e9;
vector<int> sz(N,1),pa(N),ans,dis(N);
priority_queue<pair<int,int>> pq[10];
vector<int> createFunTour(int n, int q) {
  	//int H = hoursRequired(0, N - 1);
  	//int A = attractionsBehind(0, N - 1);
	int c1=0;
	int need=(n+1)/2;
	int mn=INF;
	for(int i=1;i<n;i++){
		int t=attractionsBehind(0, i);
		if(t>=need&&t<mn){
			mn=t;
			c1=i;
		}
	}
	vector<int> r;

	vector<int> dis0(N,0);
	for(int i=0;i<n;i++){
		dis0[i]=hoursRequired(c1,i);
		if(dis0[i]==1){
			r.push_back(i);
		}
	}
	int rsz=r.size()-1;
	assert(rsz<=2);
	vector<vector<int>> dis(rsz,vector<int>(N));
	vector<int> vis(N);
	for(int i=0;i<rsz;i++){
		for(int j=0;j<n;j++){
			dis[i][j]=hoursRequired(r[i],j);
		}
	}
	for(int i=0;i<n;i++){
		if(i==c1)continue;
		int p=-1;
		for(int j=0;j<rsz;j++){
			if(dis[j][i]<dis0[i]){
				p=j;break;
			}
		}
		if(p==-1)p=rsz;
		pq[p].push({dis0[i],i});
	}
	cntid=r.size();
	int last=-1;
	for(int i=1;i<n;i++){
		pair<int,int> p={-1,-1};
		for(int j=0;j<cntid;j++){
			if(j==last||pq[j].size()==0)continue;
			p=max(p,make_pair(pq[j].top().first,j));
		}
		last=p.second;
		if(last==-1&&pq[last].size()==0)while(1){}
		auto [dis1,idx]=pq[last].top();
		pq[last].pop();
		ans.push_back(idx);
	}
	ans.push_back(c1);
	/*for(int j:ans){
		cout<<j<<' ';
	}
	cout<<endl;*/
  	return ans;
}

• Subtask 1: 10 / 10
• Subtask 2: 16 / 16
• Subtask 3: 21 / 21
• Subtask 4: 0 / 19
• Subtask 5: 0 / 34