Submission #1246384

#	Time	Username	Problem	Language	Result	Execution time	Memory
1246384		radaiosm7	Hack (APIO25_hack)	C++20	47.50 / 100	144 ms	2908 KiB

hack

#include "hack.h"
#include <bits/stdc++.h>
using namespace std;
vector<long long> x, y, di, xf, xf1, xf2, xs, xs1, xs2;
mt19937 mt(time(NULL));
int l, r, m;
bool split;
const int s = 55000;
const long long tw = 1000000000000LL;

int hack(){
    while (true) {
        x.clear();
        for (int i=0; i < s; ++i) x.push_back(mt()%tw+1LL);
        sort(x.begin(), x.end());
        x.erase(unique(x.begin(), x.end()), x.end());
        if (collisions(x) != 0) break;
    }

    split = false;

    while ((!split && (int)x.size() > 2) || (split && ((int)xf.size() > 1 || (int)xs.size() > 1))) {
        if (!split) {
            m = (int)x.size();
            xf.clear();
            xs.clear();
            for (int i=0; i < m/2; ++i) xf.push_back(x[i]);
            for (int i=m/2; i < m; ++i) xs.push_back(x[i]);

            if (collisions(xf) != 0) {
                x = xf;
                continue;
            }

            if (collisions(xs) != 0) {
                x = xs;
                continue;
            }
        }
    
        split = true;
        xf1.clear();
        xf2.clear();
        m = (int)xf.size();
        for (int i=0; i < m/2; ++i) xf1.push_back(xf[i]);
        for (int i=m/2; i < m; ++i) xf2.push_back(xf[i]);
        
        xs1.clear();
        xs2.clear();
        m = (int)xs.size();
        for (int i=0; i < m/2; ++i) xs1.push_back(xs[i]);
        for (int i=m/2; i < m; ++i) xs2.push_back(xs[i]);

        y.clear();
        for (auto el : xf1) y.push_back(el);
        for (auto el : xs1) y.push_back(el);
        if (collisions(y) != 0) {
            xf = xf1;
            xs = xs1;
            continue;
        }

        y.clear();
        for (auto el : xf2) y.push_back(el);
        for (auto el : xs1) y.push_back(el);
        if (collisions(y) != 0) {
            xf = xf2;
            xs = xs1;
            continue;
        }

        y.clear();
        for (auto el : xf1) y.push_back(el);
        for (auto el : xs2) y.push_back(el);
        if (collisions(y) != 0) {
            xf = xf1;
            xs = xs2;
            continue;
        }

        y.clear();
        for (auto el : xf2) y.push_back(el);
        for (auto el : xs2) y.push_back(el);
        xf = xf2;
        xs = xs2;
    }

    long long diff;
    if (!split) diff = x[1]-x[0];
    else diff = xs[0]-xf[0];

    for (long long d=2LL; d*d <= diff; ++d) {
        if (diff % d == 0LL) {
            di.push_back(d);
            di.push_back(diff/d);
        }
    }

    di.push_back(diff);
    sort(di.begin(), di.end());
    int dsz = (int)di.size();

    for (int p=0; p < dsz; ++p) {
        vector<long long> v;
        v.push_back(1LL);
        v.push_back(di[p]+1LL);
        if (collisions(v) == 1) return di[p];
    }

    return 0;
}

• Subtask 0: 0 / 0
• Subtask 1: 8 / 8
• Subtask 2: 17 / 17
• Subtask 3: 22.4803 / 75