Submission #991400

#	Time	Username	Problem	Language	Result	Execution time	Memory
991400		onbert	Broken Device (JOI17_broken_device)	C++17	85 / 100	40 ms	2732 KiB

Anna

#include "Annalib.h"
#include <bits/stdc++.h>
using namespace std;
#define int long long
const int m = 37, M = 251;
 
void Anna(int32_t n, long long X, int32_t k, int32_t p[]){
    int pwr[m+1];
    pwr[0] = 1;
    for (int i=1;i<=m;i++) pwr[i] = pwr[i-1] * 3;

    int a[n];
    for (int i=0;i<n;i++) a[i] = 1;
    for (int i=0;i<k;i++) a[p[i]] = 0;
    k = 0;
    for (int i=0;i<n;i++) if (!a[i] || !a[i^1]) {
        a[i] = 0;
        if (i%2==0) k++;
    }
    // cout << k << endl;
    if (k>=38) {
        int Y = X/pwr[33];
        // cout << "test " << Y << endl;
        int pro = 1;
        for (int i=0;i<75;i++) if (!a[i*2]) pro = pro * (i+1) % M;
        bool done = false;
        for (int i=0;i<75;i++) {
            for (int j=i+1;j<75;j++) {
                if ((i+1)*(j+1)*pro % M == Y && a[i*2] && a[j*2]) {
                    a[i*2] = a[i*2+1] = a[j*2] = a[j*2+1] = 0;
                    done = true;
                    break;
                }
            }
            if (done) break;
        }
    }
    int cur = 0;
    for (int i=0;i<n;i+=2) {
        int val = X % 3;
        int x = 1, y = 1;
        if (val==0) x = 0, y = 1;
        if (val==1) x = 1, y = 0;
        if (((!a[i]) && x) || ((!a[i+1]) && y)) {
            a[i] = a[i+1] = 0;
            continue;
        }
        a[i] = x, a[i+1] = y;
        X /= 3;
        cur++;
    }
    // for (int i=0;i<n;i++) cout << a[i]; cout << endl;
    for (int i=0;i<n;i++) Set(i, (int32_t)a[i]);
}

Bruno

#include "Brunolib.h"
#include <bits/stdc++.h>
using namespace std;
#define int long long
const int M = 251;
 
long long Bruno(int32_t n, int32_t a[]){
    int m = 37;
    int pwr[m+1];
    pwr[0] = 1;
    for (int i=1;i<=m;i++) pwr[i] = pwr[i-1] * 3;
    int k = 0;
    for (int i=0;i<n;i+=2) k += (!a[i] && !a[i+1]);
    int x = 0;
    if (k>=38) {
        int prod = 1;
        for (int i =0;i<75;i++) if (!a[i*2] && !a[i*2+1]) prod = prod * (i+1) % M;
        x += prod * pwr[33];
        // cout << prod << endl;
        m = 32;
    }
    int cur = 0;
    for (int i=0;i<n && cur<=m;i+=2) if (a[i]==1 || a[i+1]==1) {
        if (a[i]==1 && a[i+1]==0) x += pwr[cur];
        if (a[i]==1 && a[i+1]==1) x += 2 * pwr[cur];
        cur++;
    }
    return x;
}

• Subtask 1: 85 / 100