Submission #425985

#	Time	Username	Problem	Language	Result	Execution time	Memory
425985		egekabas	Xoractive (IZhO19_xoractive)	C++14	6 / 100	245 ms	28464 KiB

Xoractive

#include "interactive.h"
#include <bits/stdc++.h>
#define all(x) (x).begin(), (x).end()
#define ff first
#define ss second
#define pb push_back
#define mp make_pair
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<ll, ll> pll;
typedef pair<ull, ull> pull;
typedef pair<int, int> pii;
typedef pair<ld, ld> pld;
int q(int x){
	return ask(x+1);
}
vector<int> q(vector<int> v){
	if(v.empty())
		return {};
	for(auto &u : v)
		u++;
	vector<int> res = get_pairwise_xor(v);
	reverse(all(res));
	for(int i = 0; i < v.size(); ++i)
		res.pop_back();
	reverse(all(res));
	return res;
}
map<int, int> mpp[109];
vector<int> guess(int n) {
	int maxbit = 0;
	while(++maxbit)
		if((1<<maxbit) > n-1)
			break;
	vector<int> ans(n, -1);
	vector<int> known;
	for(int i = 0; i < n; ++i)
		if((1<<maxbit)-1-i < n){
			known.pb(i);
			known.pb((1<<maxbit)-1-i);
			break;
		}
	for(auto u : known)
		ans[u] = q(u);
	for(int bit = 0; bit < maxbit; ++bit)
		for(int col = 0; col < 2; ++col){
			vector<int> vec;
			for(int i = 0; i < n; ++i){
				if(((i&(1<<bit)) > 0) == col)
					vec.pb(i);
			}
			//cout << bit << ' ' << col << ' ' << vec.size() << '\n';
			
			vec = q(vec);
			
			for(auto val : known)
				if(((val&(1<<bit)) > 0) == col)
					for(auto &u : vec)
						u ^= ans[val];
			

			for(int i = 0; i < n; ++i)
				if(((i&(1<<bit)) > 0) == col)
					for(auto u : vec)
						mpp[i][u]++;
		}
	for(int i = 0; i < n; ++i){
		if(ans[i] != -1) continue;
		pii maxi = {-1, -1};
		for(auto u : mpp[i]){
			maxi = max(maxi, {u.ss, u.ff});
			//cout << i << ' ' << u.ff << ' ' << u.ss << '\n';
		}
		ans[i] = maxi.ss;
		/*for(int j = i+1; j < n; ++j){
			int common = 0;
			for(int bit = 0; bit < maxbit; ++bit)
				common += ((i&(1<<bit)) == (j&(1<<bit)));
			mpp[j][ans[i]] -= common;
		}*/
	}
	//for(auto u : ans)
	//	cout << u << '\n';
	return ans;
}

Compilation message (stderr)

Xoractive.cpp: In function 'std::vector<int> q(std::vector<int>)':
Xoractive.cpp:26:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |  for(int i = 0; i < v.size(); ++i)
      |                 ~~^~~~~~~~~~

• Subtask 1: 6 / 6
• Subtask 2: 0 / 94