Submission #994844

#	Time	Username	Problem	Language	Result	Execution time	Memory
994844		NintsiChkhaidze	Library (JOI18_library)	C++17	19 / 100	214 ms	592 KiB

library

#include "library.h"
#include <bits/stdc++.h>
#define ll long long
#define ull unsigned long long
using namespace std;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll rnd(ll B) {
	return (ull)rng() % B;
}
 
int n;

bool check(int x,int y){
	vector <int> M(n);
	M[x] = 1;
	M[y] = 1;
	
	return (Query(M) == 1);
}

void Solve(int N){
	n = N;
	
	vector<int> ans(N),fix(N),del(N);
	for(int i = 0; i < N; i++) {
		ans[i] = fix[i] = 0;
	}
	
	int l = 0,r = N - 1;
	while (l <= r){
		
		int tot = 0;
		vector <int> M(N);
		for (int i = 0; i < N; i++) {
			M[i] = 1;
			del[i] = 0;
			if (fix[i]) M[i] = 0,del[i] = 1;
			else ++tot;
		}
		
		if (l == r){
			for (int i=0;i<N;i++){
				if (M[i]) {
					ans[l] = i;
					break;
				}
			}
			break;
		}
		
		int cnt = 0;
		while (tot > 0){
			int k;
			while (1){
				k = rnd(N);
				if (del[k]) continue;
				break;
			}
			
			del[k] = 1;
			tot -= 1;
			M[k] = 0;
			if (Query(M) == 1){
				++cnt;
				if (cnt == 1) ans[l] = k;
				else ans[r] = k; 
				fix[k] = 1;
			}
			
			if (cnt == 2) break;
			
			M[k] = 1;
		}
		
		if (l && !check(ans[l - 1],ans[l])){
			swap(ans[l],ans[r]);
		}
		
		l += 1;
		r -= 1;
	}
	
	for (int i=0;i<N;i++)
		ans[i] += 1;
	Answer(ans);
}

• Subtask 1: 19 / 19
• Subtask 2: 0 / 81