Submission #336713

#	Time	Username	Problem	Language	Result	Execution time	Memory
336713		amoo_safar	Library (JOI18_library)	C++17	100 / 100	409 ms	528 KiB

library

#include "library.h"
#include <bits/stdc++.h>

#define pb push_back
#define all(x) x.begin(), x.end()

using namespace std;

vector< vector<int> > V;

int n;

int Ask(int L, int R){
	vector<int> Q(n, 0);
	for(int i = L; i < R; i++)
		for(int j : V[i])
			Q[j] = 1;
	// cerr << "#@$ ";
	// for(auto x : Q) cerr << x;
	// cerr << " -> " << Query(Q) << '\n';
	return Query(Q);
}

bool Nei(int a, int b){
	vector<int> Q(n, 0);
	Q[a] = 1; Q[b] = 1;
	return Query(Q) == 1;
}
int tri(int a, int b, int c){
	vector<int> Q(n, 0);
	Q[a] = 1; Q[b] = 1; Q[c] = 1;
	return Query(Q);
}
void Insert(int i, int j){
	assert(i < j);
	for(auto x : V[j])
		V[i].pb(x);
	V[j].clear();
	V.erase(V.begin() + j);
}

void Comb(int i, int j){
	if(V[i].size() == 1) swap(V[i], V[j]);
	if(V[j].size() == 1){
		if((V[i].size() == 1) || (Nei(V[j][0], V[i].back()))){
			Insert(i, j);
			return ;
		}
		reverse(all(V[i]));
		assert(Nei(V[i].back(), V[j][0]));
		Insert(i, j);
		return ;
	}
	if(tri(V[i][0], V[j][0], V[j].back()) == 2 - (V[j].size() == 2)) reverse(all(V[i]));
	if(!Nei(V[i].back(), V[j][0])) reverse(all(V[j]));
	Insert(i, j);
}

void Solve(int _n){
	n = _n;
	V.resize(n, vector<int>(0));
	for(int i = 0; i < n; i++) V[i].pb(i);
	
	int L, R, mid=0;
	while((int) V.size() > 1){
		// cerr << "! " << V.size() << '\n';
		// cerr << "WTF : ";
		// for(auto Y : V)
		// 	cerr << Y.size() << ' ';
		// cerr << '\n';

		L = 1, R = V.size();
		while(L + 1 < R){
			mid = (L + R) >> 1;
			if(Ask(0, mid) < mid) R = mid;
			else L = mid;
		}
		int res = R - 1;
		L = 0, R = res;
		while(L + 1 < R){
			mid = (L + R) >> 1;
			if(Ask(mid, res + 1) < (res + 1 - mid)) L = mid;
			else R = mid; 
		}
		// cerr << "# " << L << ' ' << res << '\n';
		Comb(L, res);
	}
	for(auto &x : V[0]) x++;
	// cerr << "! " << n << ' ' << V[0].size() << '\n';
	Answer(V[0]);
}

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