Submission #789154

#	Time	Username	Problem	Language	Result	Execution time	Memory
789154		Sohsoh84	Unscrambling a Messy Bug (IOI16_messy)	C++17	100 / 100	2 ms	504 KiB

messy

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

using namespace std;

const int MAXN = 1e6 + 10;

#define sep		' '
#define debug(x)	cerr << #x << ": " << x << endl;

int n, P[MAXN];

void ask(string s, int l, int r) {
	if (r - l + 1 < 2) return;	
	int mid = (l + r) >> 1;
	for (int i = l; i <= mid; i++) {
		s[i] = '1';
		add_element(s);
		s[i] = '0';
	}

	for (int i = l; i <= mid; i++) s[i] = '1';
	ask(s, mid + 1, r);
	for (int i = l; i <= mid; i++) s[i] = '0';
	for (int i = mid + 1; i <= r; i++) s[i] = '1';
	ask(s, l, mid);
}

void get(string s, int l, int r, vector<int> poss) {
	if (l == r) {
		P[poss.front()] = l;
		return;
	}

	vector<int> f[2];
	for (int e : poss) {
		s[e] = '1';
		if (check_element(s)) f[0].push_back(e);
		else f[1].push_back(e);
		s[e] = '0';
	}


	int mid = (l + r) >> 1;

	for (int e : f[0]) s[e] = '1';
	get(s, mid + 1, r, f[1]);
	for (int e : f[0]) s[e] = '0';
	for (int e : f[1]) s[e] = '1';
	get(s, l, mid, f[0]);
}

vector<int> restore_permutation(int n_, int w, int r) {
	n = n_;
	string s;
	vector<int> vec;
	for (int i = 0; i < n; i++) {
		vec.push_back(i);
		s.push_back('0');
	}

	ask(s, 0, n - 1);
	compile_set();
	get(s, 0, n - 1, vec);
	vector<int> ans;

	for (int i = 0; i < n; i++)
		ans.push_back(P[i]);

	return ans;
}

• Subtask 1: 20 / 20
• Subtask 2: 18 / 18
• Subtask 3: 11 / 11
• Subtask 4: 21 / 21
• Subtask 5: 30 / 30