Submission #568302

#	Time	Username	Problem	Language	Result	Execution time	Memory
568302		blue	Park (JOI17_park)	C++17	0 / 100	161 ms	31264 KiB

park

#include "park.h"
#include <vector>
#include <algorithm>
#include <iostream>
using namespace std;

using vi = vector<int>;
using vvi = vector<vi>;
using pii = pair<int, int>;
using vpii = vector<pii>;
#define sz(x) int(x.size())

int N;
const int maxN = 1400;

static int Place[maxN];
vi parent(maxN, 0);

vi inserted(maxN, 0);


bool ask(int A, int B, int Place[])
{
	return Ask(min(A, B), max(A, B), Place);
}

void answer(int a, int b)
{
	Answer(min(a, b), max(a, b));
}





bool connected(int u, int v)
{
	for(int i = 0; i < N; i++)
		Place[i] = 0;

	Place[u] = Place[v] = 1;

	return ask(u, v, Place);
}


void insert_node(int u, int a)
{
	if(inserted[u]) return;

	// cerr << "insert node " << u << ' ' << a << '\n';

	if(connected(u, a))
	{
		parent[u] = a;

		inserted[u] = 1;

		return;
	}

	vi searchlist;
	for(int i = 0; i < N; i++)
	{
		if(i == u || i == a) continue;
		searchlist.push_back(i);
	}

	while(sz(searchlist) > 1)
	{
		int md = sz(searchlist)/2;

		vi lft, rgt;
		for(int i = 0; i < sz(searchlist); i++)
		{
			if(i < md)
				lft.push_back(searchlist[i]);
			else
				rgt.push_back(searchlist[i]);
		}

		for(int i = 0; i < N; i++)
			Place[i] = 0;

		for(int f : rgt)
			Place[f] = 1;

		Place[u] = Place[a] = 1;

		if(ask(u, a, Place))
			searchlist = lft;
		else
			searchlist = rgt;
	}

	int z = searchlist[0];

	insert_node(u, z);
	insert_node(z, a);
}

void Detect(int T, int N_) 
{
	N = N_;
	inserted[0] = 1;
                     
	for(int i = 1; i < N; i++)
		insert_node(i, 0);

	for(int i = 1; i < N; i++)
		answer(i, parent[i]);
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 27
• Subtask 4: 0 / 30
• Subtask 5: 0 / 23