Submission #1048475

#	Time	Username	Problem	Language	Result	Execution time	Memory
1048475		Tob	Magic Show (APIO24_show)	C++17	100 / 100	2 ms	1088 KiB

Alice

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

#define F first
#define S second
#define all(x) x.begin(), x.end()
#define pb push_back
#define FIO ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)

using namespace std;

typedef long long ll;
typedef pair <int, int> pii;

const int B = 80, bit = 60, seed = 12345, C = 20;

vector <pii> Alice() {
	int w = B*bit;
	ll x = setN(w+C);
	vector <pii> res;
	
	mt19937 rng(seed);
	
	vector <int> p;
	for (int i = 0; i < w; i++) p.pb(i/B);
	shuffle(all(p), rng);
	
	for (int i = 1; i < C; i++) res.pb({w+i, w+i+1});
	
	mt19937 rng2(x);
	
	auto val = [&](int x) {
		uniform_int_distribution <int> rnd(0, x-1);
		return rnd(rng2);
	};
	
	for (int i = 0; i < w; i++) {
		if (x & (1LL << p[i])) res.pb({i+1, i+val(C/2-1)+3});
		else res.pb({i+1, i+C/2+val(C/2)+2});
	}
	return res;
}

Bob

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

#define F first
#define S second
#define all(x) x.begin(), x.end()
#define pb push_back
#define FIO ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)

using namespace std;

typedef long long ll;
typedef pair <int, int> pii;

const int B = 80, bit = 60, seed = 12345, C = 20;

ll Bob(vector <pii> v) {
	int w = B*bit;
	mt19937 rng(seed);
	
	vector <int> p;
	for (int i = 0; i < w; i++) p.pb(i/B);
	shuffle(all(p), rng);
	
	ll res = 0;
	for (auto x : v) {
		if (x.S - x.F <= C/2 && x.F-1 < w) res |= (1LL << p[x.F-1]);
	}
	
	return res;
}

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