Submission #970631

#	Time	Username	Problem	Language	Result	Execution time	Memory
970631		pedroslrey	Xoractive (IZhO19_xoractive)	C++17	100 / 100	3 ms	600 KiB

Xoractive

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

using namespace std;

vector<int> guess(int n) {
	unordered_map<int, int> mp;
	for (int k = 0; k < 7; ++k) {
		vector<int> xs;
		for (int i = 1; i < n; ++i)
			if (i & (1 << k)) 
				xs.push_back(i);

		if (xs.empty()) continue;

		auto small = get_pairwise_xor(xs);
		xs.push_back(n);
		auto large = get_pairwise_xor(xs);

		for (int x: small)
			large.erase(lower_bound(large.begin(), large.end(), x));

		for (int x: large)
			mp[x] |= 1 << k;
	}

	int x = ask(n);

	vector<int> xs(n);
	for (auto [k, v]: mp) if (k != 0)
		xs[v-1] = k ^ x;

	xs.back() = x;

	return xs;
}

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