Submission #1189175

#	Time	Username	Problem	Language	Result	Execution time	Memory
1189175		Zbyszek99	Portal (BOI24_portal)	C++20	40 / 100	14 ms	2496 KiB

Main

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define ll long long
#define ld long double
#define ull unsigned long long
#define ff first
#define ss second
#define pii pair<int,int>
#define pll pair<long long, long long>
#define vi vector<int>
#define vl vector<long long>
#define pb push_back
#define rep(i, b) for(int i = 0; i < (b); ++i)
#define rep2(i,a,b) for(int i = a; i <= (b); ++i)
#define rep3(i,a,b,c) for(int i = a; i <= (b); i+=c)
#define count_bits(x) __builtin_popcountll((x))
#define all(x) (x).begin(),(x).end()
#define siz(x) (int)(x).size()
#define forall(it,x) for(auto& it:(x))
using namespace __gnu_pbds;
using namespace std;
typedef tree<int, null_type, less<int>, rb_tree_tag,tree_order_statistics_node_update> ordered_set;
//mt19937 mt;void random_start(){mt.seed(chrono::time_point_cast<chrono::milliseconds>(chrono::high_resolution_clock::now()).time_since_epoch().count());}
//ll los(ll a, ll b) {return a + (mt() % (b-a+1));}
const int INF = 1e9+50;
const ll INF_L = 1e18+40;
const ll MOD = 1e9+7;

pair<pll,pll> get_0_y(pll v0, pll v1)
{
    if(v0.ff < 0)
    {
        v0.ff *= -1;
        v0.ss *= -1;
    }
    if(v1.ff < 0)
    {
        v1.ff *= -1;
        v1.ss *= -1;
    }
    if(!(v0.ff >= v1.ff)) swap(v0,v1);
    if(v1.ff == 0) return {v1,v0};
    ll ile = v0.ff/v1.ff;
    v0.ff -= ile*v1.ff;
    v0.ss -= ile*v1.ss;
    if(v0.ff == 0) return {v0,v1};
    else return get_0_y(v0,v1);
}

int main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    //random_start();
    int n;
    cin >> n;
    ll px, py;
    cin >> px >> py;
    vector<pll> vects;
    rep(i,n-1)
    {
        ll x,y;
        cin >> x >> y;
        x -= px;
        y -= py;
        vects.pb({x,y});
    }
    if(siz(vects) <= 1)
    {
        cout << "-1\n";
        return 0;
    }
    pll v0 = vects[0];
    pll v1 = vects[1];
    pair<pll,pll> new_v = get_0_y(v0,v1);
    v0 = new_v.ff;
    v1 = new_v.ss;
    rep2(i,2,n-2)
    {
        new_v = get_0_y(v1,vects[i]);
        v1 = new_v.ss;
        v0.ss = __gcd(v0.ss,new_v.ff.ss);
    }
    if(v0.ff * v1.ss == v1.ff * v0.ss)
    {
        cout << "-1\n";
    }
    else
    {
        cout << abs(v0.ff * v1.ss - v1.ff * v0.ss) << "\n";
    }
    return 0;
}

• Subtask 1: 1 / 1
• Subtask 2: 10 / 10
• Subtask 3: 0 / 10
• Subtask 4: 29 / 29
• Subtask 5: 0 / 15
• Subtask 6: 0 / 35