Submission #1107530

#	Time	Username	Problem	Language	Result	Execution time	Memory
1107530		andrei_c1	Magic Show (APIO24_show)	C++17	0 / 100	2 ms	804 KiB

Alice

#include "Alice.h"
#include <bits/stdc++.h>
using namespace std;
using ll = long long;

vector<pair<int, int>> Alice() {
	const int kBits = 60;
	const int kBuc = 83;
	const int kN = kBits * kBuc + 2;
	const int kSeed = 27;
	ll x = setN(kN);
	vector<pair<int, int>> edg;
	auto addEdge = [&](int u, int v) -> void {
		edg.emplace_back(u, v);
	};
	addEdge(1, 2);
	int u = 3;
	mt19937 rng(kSeed);
	auto addBit = [&](int i) -> void {
		bool b = x >> i & 1ll;
		for(int _ = 0; _ < kBuc; _++) {
			uint32_t rval = rng();
			addEdge(u, (rval + b) % (u - 1) + 1);
			u++;
		}
	};
	for(int i = 0; i < kBits; i++) {
		addBit(i);
	}
	random_shuffle(edg.begin(), edg.end());
	return edg;
}

Bob

#include "Bob.h"
#include <bits/stdc++.h>
using namespace std;
using ll = long long;

ll Bob(vector<pair<int, int>> edg){
	const int kBits = 60;
	const int kBuc = 83;
	const int kSeed = 27;
	sort(edg.begin(), edg.end());
	auto contains = [&](int u, int v) -> bool {
		return binary_search(edg.begin(), edg.end(), make_pair(u, v));
	};
	int u = 3;
	ll x = 0;
	mt19937 rng(kSeed);
	auto findBit = [&]() -> ll {
		ll res = 0;
		for(int _ = 0; _ < kBuc; _++) {
			uint32_t rval = rng();
			for(bool b : {false, true}) {
				if(contains(u, (rval + b) % (u - 1) + 1)) {
					res = b;
				}
			}
			u++;
		}
		return res;
	};
	for(int i = 0; i < kBits; i++) {
		x |= findBit() << i;
	}
	return x;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 30
• Subtask 3: 0 / 65