Submission #770532

#	Time	Username	Problem	Language	Result	Execution time	Memory
770532		rxlfd314	Xoractive (IZhO19_xoractive)	C++17	100 / 100	4 ms	464 KiB

Xoractive

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

vector<int> guess(int N) {
	vector<int> ans(N);
	ans[0] = ask(1);
	map<int, int> inds;
	for (int j = 0; (1 << j) <= N; j++) {
		vector<int> v;
		for (int i = 1; i < N; i++) {
			if (i & 1 << j) {
				v.push_back(i+1);
			}
		}
		if (!v.size()) continue;
		vector<int> a = get_pairwise_xor(v);
		v.push_back(1);
		vector<int> b = get_pairwise_xor(v);
		multiset<int> s(b.begin(), b.end());
		for (int i : a) {
			s.erase(s.find(i));
		}
		set<int> ss(s.begin(), s.end());
		for (int i : ss) {
			if (i) {
				inds[i^ans[0]] += 1 << j;
			}
		}
	}
	for (auto [a, b] : inds) {
		ans[b] = a;
	}
	return ans;
}

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