Submission #1084788

#	Time	Username	Problem	Language	Result	Execution time	Memory
1084788		Math4Life2020	Magic Show (APIO24_show)	C++17	5 / 100	3 ms	824 KiB

Alice

#include <bits/stdc++.h>
using namespace std;
#include "Alice.h"
using ll = long long; using pii = pair<ll,ll>;
const ll SEED = 82014384209183;
const ll E = 15;
const ll N = 5000;

ll l2(ll x) {
	return (31-__builtin_clz(x));
}

vector<pair<int,int>> Alice() {
	ll X = setN((int)N); //X<=10^18<2^60
	mt19937 gen(SEED);
	vector<pair<int,int>> ans; 
	for (ll x=1;x<N;x++) {
		ll y=0;
		ll lx = l2(x);
		for (ll i=0;i<lx;i++) {
			ll bv = gen()%E;
			y += (1LL<<i)*((X>>bv)&1);
		}
		ans.push_back({y+1,x+1});
	}
	return ans;
}

Bob

#include <bits/stdc++.h>
#include "Bob.h"
using namespace std;
using ll = long long; using pii = pair<ll,ll>;
const ll SEED = 82014384209183;
const ll E = 15;
const ll N = 5000;

ll l2(ll x) {
	return (31-__builtin_clz(x));
}

ll Bob(vector<pair<int,int>> V) {
	mt19937 gen(SEED);
	ll ans = 0;
	ll read[N];
	for (ll i=0;i<N;i++) {
		read[i]=-1;
	}
	for (pii p0: V) {
		ll y = p0.first; ll x = p0.second;
		x--; y--;
		read[x]=y;
	}
	for (ll x=1;x<N;x++) {
		ll RD=read[x];
		ll lx = l2(x);
		for (ll i=0;i<lx;i++) {
			ll bv = gen()%E;
			if (RD!=-1) {
				ans |= (1LL<<bv)*((RD>>i)&1);
			}
		}
	}
	return ans;
}

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