Submission #440272

#TimeUsernameProblemLanguageResultExecution timeMemory
440272dutchXoractive (IZhO19_xoractive)C++17
88 / 100
10 ms880 KiB
#include <bits/stdc++.h>
#include "interactive.h"
using namespace std;
 
vector<int> a[8];
set<int> s[8];
 
void dfs(int l, int r, int lvl){
	if(r - l < 2) return;
	int m = (l + r) / 2;
	for(int i=l; i<m; ++i) a[lvl].push_back(i);
	dfs(l, m, lvl+1);
	dfs(m, r, lvl+1);
}
 
int find(int l, int r, int lvl, int v){
	if(r - l == 1) return l;
	int m = (l + r) / 2;
	if(s[lvl].find(v) == s[lvl].end())
		return find(m, r, lvl+1, v);
	else return find(l, m, lvl+1, v);
}
 
vector<int> guess(int n){
	int m = ask(n);
	dfs(1, n, 1);
	for(int i=1; i<n; ++i) a[0].push_back(i);
	for(int i=0; i<8; ++i){
		if(a[i].empty()) break;
		vector<int> x = get_pairwise_xor(a[i]);
		a[i].push_back(n);
		vector<int> y = get_pairwise_xor(a[i]);
		multiset<int> t;
		for(int j : y) t.insert(j);
		for(int j : x) t.erase(t.find(j));
		for(int j : t)
			if(j) s[i].insert(j ^ m);
	}
 
	vector<int> ans(n);
	for(int i : s[0]) ans[find(1, n, 1, i)-1] = i;
	ans[n-1] = m;
	return ans;
}
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