Submission #1076606

#	Time	Username	Problem	Language	Result	Execution time	Memory
1076606		raphaelp	Portal (BOI24_portal)	C++14	11 / 100	49 ms	6344 KiB

Main

#include <bits/stdc++.h>
using namespace std;
int main()
{
    long long N;
    cin >> N;
    long long X, Y;
    cin >> X >> Y;
    vector<pair<long long, long long>> Tab;
    for (long long i = 0; i < N - 1; i++)
    {
        long long x, y;
        cin >> x >> y;
        Tab.push_back({x - X, y - Y});
    }
    if (N <= 2)
    {
        cout << -1;
        return 0;
    }
    vector<pair<long long, long long>> Tab2;
    for (int i = 0; i < 100; i++)
    {
        if ((double)Tab[0].first / Tab[1].first != (double)Tab[0].second / Tab[1].second)
            break;
        random_shuffle(Tab.begin(), Tab.end());
    }
    while (!Tab.empty() && Tab[0].first == 0)
    {
        Tab2.push_back(Tab[0]);
        swap(Tab[0], Tab[Tab.size() - 1]);
        Tab.pop_back();
    }
    while (Tab.size() > 1)
    {
        while (Tab.size() > 1 && Tab[1].first == 0)
        {
            swap(Tab[1], Tab[Tab.size() - 1]);
            Tab2.push_back(Tab[Tab.size() - 1]);
            Tab.pop_back();
        }
        if (Tab.size() == 1)
            break;
        if (abs(Tab[1].first) < abs(Tab[0].first))
            swap(Tab[1], Tab[0]);
        long long x = Tab[1].first / Tab[0].first;
        Tab[1].first -= Tab[0].first * x;
        Tab[1].second -= Tab[0].second * x;
        if (Tab[1].first == 0 && Tab[1].second != 0)
        {
            x = Tab[0].second / Tab[1].second;
            Tab[0].second -= Tab[1].second * x;
        }
    }
    while (!Tab2.empty() && Tab2[0].second == 0)
    {
        swap(Tab2[0], Tab2[Tab2.size() - 1]);
        Tab2.pop_back();
    }
    while (Tab2.size() > 1)
    {
        while (Tab2.size() > 1 && Tab2[1].second == 0)
        {
            swap(Tab2[1], Tab2[Tab2.size() - 1]);
            Tab2.pop_back();
        }
        if (Tab2.size() == 1)
            break;
        if (abs(Tab2[1].second) < abs(Tab2[0].second))
            swap(Tab2[1], Tab2[0]);
        long long x = Tab2[1].second / Tab2[0].second;
        Tab2[1].second -= Tab2[0].second * x;
    }
    if (Tab2.empty())
        cout << -1;
    else
        cout << abs((long long)Tab[0].first * (long long)Tab2[0].second);
}

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