Submission #44396

#	Time	Username	Problem	Language	Result	Execution time	Memory
44396		Bruteforceman	Library (JOI18_library)	C++14	100 / 100	642 ms	844 KiB

library

#include <bits/stdc++.h>
#include "library.h"
using namespace std;
bool vis[10000];
vector <int> P, Q;
int size;

void print(vector <int> &M) {
	for(auto i : M) {
		cout << i << " ";
	}
	cout << endl;
}

int query(vector <int> &v) {
	bool good = false;
	for(int i = 0; i < size; i++) {
		if(v[i] == 1) {
			good = true;
			break;
		}
	}
	return good ? Query(v) : 0;
}
bool goodSet(vector <int> &v) {
	vector <int> com (size);
	for(int i = 0; i < size; i++) {
		if(vis[i]) com[i] = 1;
		else com[i] = v[i] ^ 1;
	}
	int p = query(v);
	int q = query(com);
	return (p - 1) != q;
}
bool adjacent(int p, int q) {
	vector <int> v (size);
	v[p] = 1;
	v[q] = 1;
	return query(v) == 1;
}
bool goodSet(int p, int q, vector <int> &v) {
	vector <int> shit (size);
	for(int i = 0; i < size; i++) shit[i] = vis[i];
	for(int i = p; i <= q; i++) shit[v[i]] = 1;
	return goodSet(shit);
}
int search(int b, int e, vector <int> &v) {
	if(b == e) {
		return b;
	}
	int m = (b + e) >> 1;
	if(goodSet(b, m, v)) return search(b, m, v);
	else return search(m + 1, e, v);
}

void Solve(int N)
{
	if(N == 1) {
		vector <int> ans;
		ans.push_back(1);
		Answer(ans);
		return ;
	}
	size = N;
	vector<int> M(N);
	for(int i = 0; i < size; i++) {
		M[i] = i;
	}
	memset(vis, false, sizeof vis);
	vector <int> H (size);
	fill(H.begin(), H.end(), 1);
	for(int i = 0; i < size; i++) {
		H[i] = 0;
		if(query(H) == 1) {
			vis[i] = true;
			M.erase(find(M.begin(), M.end(), i));
			if(P.empty()) P.push_back(i);
			else Q.push_back(i);
		}
		H[i] = 1;
	}
	while(P.size() + Q.size() < N) {
		int can = search(0, M.size() - 1, M);
		int val = M[can];
		if (adjacent(P.back(), val)) P.push_back(val);
		else Q.push_back(val);
		M.erase(M.begin() + can);
		vis[val] = true;
	}
	reverse(Q.begin(), Q.end());
	vector<int> res(N);
	for(int i = 0; i < P.size(); i++) {
		res[i] = P[i] + 1;
	}
	for(int i = 0; i < Q.size(); i++) {
		res[i + P.size()] = Q[i] + 1;
	}
	Answer(res);
}

Compilation message (stderr)

library.cpp: In function 'void Solve(int)':
library.cpp:82:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  while(P.size() + Q.size() < N) {
        ~~~~~~~~~~~~~~~~~~~~^~~
library.cpp:92:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 0; i < P.size(); i++) {
                 ~~^~~~~~~~~~
library.cpp:95:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 0; i < Q.size(); i++) {
                 ~~^~~~~~~~~~

• Subtask 1: 19 / 19
• Subtask 2: 81 / 81