Submission #1099116

#	Time	Username	Problem	Language	Result	Execution time	Memory
1099116		thangdz2k7	Broken Device (JOI17_broken_device)	C++17	0 / 100	242 ms	2936 KiB

Anna

#include <bits/stdc++.h>
#define fi first
#define se second
#include "Annalib.h"

using namespace std;

mt19937 rng(145);

const int m = 150, T = 60;

bitset <T> a[m];

long long rnd(long long l, long long r){
    return l + rng() % (r - l + 1);
}

#define Bit(x, i) (x >> i & 1)

void Anna(int N, long long X, int K, int P[]){
    for (int i = 0; i < m; ++ i){
        for (int j = 0; j < T; ++ j) a[i][j] = rnd(0, 1);
    }

    vector <long long> b(m, 0);
    vector <bool> broken(m, 0);
    for (int i = 0; i < K; ++ i) broken[P[i]] = 1;
    for (int i = 0; i < m; ++ i) if (!broken[i]){
        for (int j = 0; j < T; ++ j) if (a[i][j]) b[i] += (1ll << j);
    }

    vector <pair <long long, int>> basis(T, {0, 0});
    for (int i = 0; i < m; ++ i) if (!broken[i]){
        long long x = b[i];
        for (int j = 0; j < T; ++ j) if (Bit(x, j)){
            if (!basis[j].fi) {
                basis[j] = {x, i};
                break;
            }
            x ^= basis[j].fi;
        }
    }

    bitset <m> ans;
    long long x = X;
    for (int j = 0; j < T; ++ j) if (Bit(x, j)){
        ans.set(basis[j].se); x ^= basis[j].fi;
    }
    for (int i = 0; i < m; ++ i) Set(i, ans[i]);
}

Bruno

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

using namespace std;

mt19937 rng(145);

const int m = 150, T = 60;

bitset <T> a[m];

long long rnd(long long l, long long r){
    return l + rng() % (r - l + 1);
}

long long Bruno(int N, int A[]){
    long long xr = 0;
    for (int i = 0; i < m; ++ i){
        long long b = 0;
        for (int j = 0; j < T; ++ j){
            int a = rnd(0, 1);
            if (a) b += (1ll << j);
        }
        if (A[i]) xr ^= b;
    }
    return xr;
}

• Subtask 1: 0 / 100