Submission #990874

#	Time	Username	Problem	Language	Result	Execution time	Memory
990874		ToniB	Xoractive (IZhO19_xoractive)	C++17	100 / 100	3 ms	512 KiB

Xoractive

#include <bits/stdc++.h>
#include "interactive.h"
using namespace std;

vector<int> ans;

void reduce(vector<int>& v, int sz) {
	vector<int> cur = {};
	sort(v.begin(), v.end());
	for (int i = sz; i < (int)v.size(); i += 2) cur.push_back(v[i]);
	swap(cur, v);
}

vector<int> get_values(vector<int> pos) {
	vector<int> with = pos;
	with.push_back(1);
	sort(with.begin(), with.end());
	
	vector<int> xr_with = get_pairwise_xor(with);
	vector<int> xr_without = get_pairwise_xor(pos);

	reduce(xr_with, with.size());
	reduce(xr_without, pos.size());

	vector<int> vals = {};
	
	for (int val : xr_without) {
		for (int i = 0; i < (int)xr_with.size(); ++i) {
			if (xr_with[i] == val) {
				xr_with.erase(xr_with.begin() + i);
				break;
			}
		}
	}

	for (int val : xr_with) {
		vals.push_back(val ^ ans[0]);
	}

	return vals;
}

vector<int> guess(int n) {
	map<int, int> mp;
	ans.resize(n);
	ans[0] = ask(1);
	
	for (int i = 0; i < 7; ++i) {
		vector<int> cur;
		for (int j = 2; j <= n; ++j) {
			if (j & 1 << i) cur.push_back(j);
		}
		if (cur.empty()) continue;
		vector<int> v = get_values(cur);
		for (int val : v) {
			mp[val] += 1 << i;
		}
	}
	
	for (pair<int, int> p : mp) {
		ans[p.second - 1] = p.first;
	}

	return ans;
}

• Subtask 1: 6 / 6
• Subtask 2: 94 / 94