Submission #978264

#	Time	Username	Problem	Language	Result	Execution time	Memory
978264		sleepntsheep	Broken Device (JOI17_broken_device)	C11	0 / 100	72 ms	3020 KiB

Anna

#include "Annalib.h"
#include<string.h>
#include<stdlib.h>

typedef unsigned long long u64;
static u64 vecspace[150];
static void init() { for(int i=0;i<150;++i) vecspace[i]=rand()*1llu*rand(); }

u64 basis[64];
u64 basis_subtract[64][64], bo[64];

void basis_add(u64 x,int id)
{
    u64 sub[64], so=0;
    for(int j=60;j>=0;--j)
    {
        if(0==((x>>j)&1))
            continue;
        if (basis[j])
            x ^= vecspace[sub[so++] = basis[j]];
        else
        {
            sub[so++] = id;
            basis[j] = id;
            bo[j] = so;
            memcpy(basis_subtract[j], sub, sizeof *sub * so);
        }
    }
}

void Anna( int N, long long X, int K, int P[] ){
    srand(86868686u);
    init();

    int skillissue[150]={0};
    for(int i=0;i<K;++i)skillissue[P[i]]=1;

    for(int i=0;i<64;++i)basis[i]=0;
    for(int i=0;i<150;++i)
    {
        if(skillissue[i])continue;
        basis_add(vecspace[i], i);
    }

    int encoded[150]={0};

    for(int j=60;j>=0;--j)
    {
        if(0==((X>>j)&1))
            continue;

        for(u64 i=0;i<bo[j];++i)
            encoded[basis_subtract[j][i]] ^= 1;
    }

    for(int i=0;i<150;++i)
        Set(i, encoded[i]);

}

Bruno

#include "Brunolib.h"
#include<stdlib.h>

static unsigned long long vecspace[150];
static void init() { for(int i=0;i<150;++i) vecspace[i]=rand()*1llu*rand(); }

long long Bruno( int N, int A[] ){
    srand(86868686u);

    unsigned long long X=0;

    for(int i=0;i<150;++i)
        if(A[i]) X^=vecspace[i];

    return X;
}

Compilation message (stderr)

Bruno.c:5:13: warning: 'init' defined but not used [-Wunused-function]
    5 | static void init() { for(int i=0;i<150;++i) vecspace[i]=rand()*1llu*rand(); }
      |             ^~~~

• Subtask 1: 0 / 100