Submission #495978

#	Time	Username	Problem	Language	Result	Execution time	Memory
495978		BlancaHM	Carnival (CEOI14_carnival)	C++14	100 / 100	10 ms	296 KiB

carnival

#include <iostream>
#include <vector>
#include <map>
#include <unordered_set>
#include <set>
#include <algorithm>
using namespace std;

vector<int> par;
vector<int> roots;

int root(int a) {
	if (a == par[a])
		return a;
	return par[a] = root(par[a]);
}

void merge(int i, int j) {
	if (i == j)
		return;
	par[j] = i;
	auto it = find(roots.begin(), roots.end(), j);
	roots.erase(it, it+1);
}

void solve(int N, int C) {
	if (C == 1) {
		par.assign(N, 0);
		return;
	}
	par = vector<int>(N);
	for (int i = 0; i < N; i++)
		par[i] = i;

	roots = {};
	int ans, costumesDiscovered = 0;
	for (int i = 0; i < N; i++) {
		if (N - i == C - costumesDiscovered)
			continue;

        // comprobaremos si hay un conjunto al que añadir a la persona
		if(roots.size()) {
			cout << (int)roots.size()+1 << " ";
			for (int r: roots)
				cout << r+1 << ' ';
			cout << i+1 << '\n';
			cin >> ans;
			if (ans == (int) roots.size()) {
			    // hay un conjunto -> hacemos búsqueda binaria para encontrar cuál
				int lo = 0, hi = (int) roots.size()-1, mid, k = 0;
				while(lo <= hi) {
					if (lo == hi) {
						k = lo;
						break;
					}
					mid = lo + (hi-lo)/2;
					cout << (mid-lo+2) << " ";
					for (int j = lo; j <= mid; j++)
						cout << roots[j]+1 << ' ';
					cout << i+1 << '\n';
					cin >> ans;
					if (ans == (mid-lo+1)) {
						hi = mid;
						k = mid;
					} else lo = mid+1;
				}
				merge(i, roots[k]);
			}
		}

		// esta persona forma un conjunto nuevo
		if (par[i] == i) {
			costumesDiscovered++;
			roots.push_back(i);
		}
	}
}

int main() {
	int N, C;
	cin >> N;
	cout << N;
	for (int i = 1; i <= N; i++)
		cout << " " << i;
	cout << '\n';
	cin >> C;
	solve(N, C);
	map<int, int> roots;
	int c = 1;
	for (int i = 0; i < N; i++) {
		if (roots.find(root(i)) == roots.end()) {
			roots[root(i)] = c++;
		}
	}
	int costumes[N];
	for (int i = 0; i < N; i++)
		costumes[i] = roots[root(i)];
	cout << "0";
	for (int i = 0; i < N; i++)
		cout << " " << costumes[i];
	cout << '\n';
	return 0;
}

• Subtask 1: 20 / 20
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 20 / 20
• Subtask 5: 20 / 20