Submission #1206479

#	Time	Username	Problem	Language	Result	Execution time	Memory
1206479		StefanSebez	Hack (APIO25_hack)	C++20	35.80 / 100	358 ms	1660 KiB

hack

#include "hack.h"
#include <vector>
#include<bits/stdc++.h>
using namespace std;
#define fi first
#define se second
#define pb push_back
#define ll long long
#define ld long double
/*const int N=1e6+10;
vector<int>dvs[N+5];*/
const int M=3e4;
const ll inf=1e16;
mt19937_64 rng(time(0));
ll Sredi(ll x){
	ll res=x;
	vector<ll>p;
	for(int i=2;i<=sqrt(x);i++){
		while(x%i==0){x/=i;p.pb(i);}
	}
	p.pb(x);
	for(auto i:p){
		res/=i;
		if(collisions({1,res+1})==0) res*=i;
	}
	return res;
}
vector<ll> Resi(vector<ll>a){
	int n=a.size();
	vector<ll>b,c;
	for(int i=0;i<n;i++){
		if(i<=(n-1)/2) b.pb(a[i]);
		else c.pb(a[i]);
	}
	if(collisions(b)) return Resi(b);
	if(collisions(c)) return Resi(c);
	return a;
}
int hack(){
	/*for(int i=1;i<=N;i++) dvs[i].clear();
	for(int i=1;i<=N;i++) for(int j=i;j<=N;j+=i) dvs[j].pb(i);
    int x=0;
	for(int i=N;i>=1&&x==0;i--){
		if(collisions({1,i})==1){
			x=i-1;
		}
	}
	int res=x;
	for(auto i:dvs[x]){
		if(collisions({1,i+1})==1) res=min(res,i);
	}
    return res;*/
    vector<ll>a;
    int ct=0;
    while(++ct){
		a.clear();
		for(int i=1;i<=M;i++){
			a.pb(rng()%inf+1);
		}
		if(collisions(a)) break;
    }
    //cerr<<ct<<endl;
    a=Resi(a);
    int n=a.size();
    int Mid=(n-1)/2;
    int l=Mid+1,r=n-1,ind,ind1;
    while(l<r){
		int mid=l+r>>1;
		//printf("%i %i %i\n",l,mid,r);
		vector<ll>temp;
		for(int i=0;i<=Mid;i++) temp.pb(a[i]);
		for(int i=l;i<=mid;i++) temp.pb(a[i]);
		if(collisions(temp)) r=mid;
		else l=mid+1;
    }
    ind=l;
    l=0,r=Mid;
    while(l<r){
		int mid=l+r>>1;
		vector<ll>temp={a[ind]};
		for(int i=l;i<=mid;i++) temp.pb(a[i]);
		if(collisions(temp)) r=mid;
		else l=mid+1;
    }
    ind1=l;
    ll res=abs(a[ind]-a[ind1]);
    //cerr<<res<<endl;
    res=Sredi(res);
    return res;
}

• Subtask 0: 0 / 0
• Subtask 1: 8 / 8
• Subtask 2: 17 / 17
• Subtask 3: 10.7759 / 75