Submission #1078731

#	Time	Username	Problem	Language	Result	Execution time	Memory
1078731		someone	Broken Device (JOI17_broken_device)	C++14	100 / 100	55 ms	3052 KiB

Anna

#include "Annalib.h"
#include <bits/stdc++.h>
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
using i64 = long long;
using namespace std;

const int D = 60;

i64 b[D];
bitset<150> id[D];

void insert(i64 x, int idx) {
    bitset<150> act;
    act[idx] = 1;
    for(int i = D-1; i >= 0; i--)
        if(x & (1ll << i)) {
            if(b[i] == 0) {
                b[i] = x;
                id[i] = act;
                return;
            }
            x ^= b[i];
            act ^= id[i];
        }
}

void Anna(int N, long long X, int K, int P[]) {
    for(int i = 0; i < D; i++) b[i] = 0;
    vector<int> broken(N);
    for(int i = 0; i < K; i++)
        broken[P[i]] = 1;

    mt19937_64 rng(42);
    vector<i64> val(N);
    for(int i = 0; i < N; i++) {
        val[i] = rng() & ((1ll << 60) - 1);
        if(!broken[i]) insert(val[i], i);
    }
    bitset<150> ans;
    for(int i = D-1; i >= 0; i--) {
        if(X & (1ll << i)) {
            X ^= b[i];
            ans ^= id[i];
        }
    }
    for(int i = 0; i < N; i++)
        Set(i, ans[i]);
}

Bruno

#include "Brunolib.h"
#include <bits/stdc++.h>
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
using i64 = long long;
using namespace std;


long long Bruno( int N, int A[] ){
    mt19937_64 rng(42);
    i64 X = 0;
    for(int i = 0; i < N; i++) {
        i64 val = rng() & ((1ll << 60) - 1);
        if(A[i]) X ^= val;
    }
    return X;
}

• Subtask 1: 100 / 100