제출 #1219467

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1219467		12345678	Portal (BOI24_portal)	C++20	11 / 100	11 ms	1860 KiB

Main

#include <bits/stdc++.h>

using namespace std;

#define ll long long

const int nx=1e5+5;

ll n, x[nx], y[nx];

struct myvector
{
    ll x, y;
    myvector(ll x, ll y): x(x), y(y){}
};

ll cross(myvector a, myvector b)
{
    return a.x*b.y-a.y*b.x;
}

ll mydiv(ll a, ll b)
{
    if (b==0) return 1;
    else return a/b;
}
int main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    cin>>n;
    for (int i=1; i<=n; i++) cin>>x[i]>>y[i];
    if (n<=2) return cout<<-1, 0;
    myvector v1=myvector(x[2]-x[1], y[2]-y[1]), v2=myvector(x[3]-x[1], y[3]-y[1]);
    if (cross(v1, v2)==0) return cout<<-1, 0;
    cout<<abs(cross(v1, v2));
}

/*
3
1 2
4 1
0 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