Submission #1261267

#	Time	Username	Problem	Language	Result	Execution time	Memory
1261267		kikitop1gg	Portal (BOI24_portal)	C++17	11 / 100	17 ms	4032 KiB

Main

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define vi vector<ll>
#define vvi vector<vector<ll>>
#define vs vector<string>
#define vc vector<char>
#define vb vector<bool>
#define vp vector<pair<ll, ll>>
#define vpp vector<pair<ll, pair<ll, ll>>>
#define pp pair<ll, ll>
#define qi queue<ll>
#define qp queue<pp>
#define pqi priority_queue<ll>
#define pqp priority_queue<pp>
#define mi map<ll, ll>
#define mpi map<pp, ll>
#define mip map<ll, pp>
#define mp map<pp, pp>
#define mb map<ll, bool>
#define si set<ll>
#define sp set<pp>
#define sc set<char>
#define mod 1000000007
#define inf INT_MAX
#define all(x) (x).begin(), (x).end()

ll cross(pp a, pp b) {
    return abs(a.first * b.second - a.second * b.first);
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    ll n;
    cin >> n;
    vp a(n);
    for(int i = 0; i < n; i++) {
        cin >> a[i].first >> a[i].second;
    }
    if(n <= 2) {
        cout << "-1\n";
        return 0;
    }

    vp v;
    for(int i = 1; i < n; i++) {
        ll x = a[0].first - a[i].first;
        ll y = a[0].second - a[i].second;
        v.push_back({x, y});
    }

    ll ans = 0;
    for(int i = 1; i < v.size(); i++) {
        ll cur = cross(v[0], v[i]);
        ans = gcd(ans, cur);
    }

    if(ans == 0) ans = -1;
    cout << ans << '\n';

    return 0;
}

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