Submission #1203628

#	Time	Username	Problem	Language	Result	Execution time	Memory
1203628		BigBadBully	Portal (BOI24_portal)	C++20	11 / 100	40 ms	1860 KiB

Main

#include <bits/stdc++.h>
#define int long long
#define pii pair<int,int>
#define ff first
#define ss second
using namespace std;
int mcd(int a,int b)
{
    if (a>b)swap(a,b);
    if (a==0)return b;
    //a = abs(a),b = abs(b);
    return __gcd(a,b);
}

signed main()
{
    int n;
    cin >> n;
    vector<pii> v(n);
    for (int i = 0; i < n ;i++)
        cin >> v[i].ff >> v[i].ss;
    for (int i = n-1; i >= 0; i--)
        v[i].ff-=v[0].ff,v[i].ss-=v[0].ss;
    int x = (v[1].ss==0?v[1].ff:0), y = v[1].ss,px = v[1].ff,py = v[1].ss,up = v[1].ss;
    for (int i = 2; i < n; i++)
    {
        int fnt = 0;
        if (v[i].ff == 0)
            fnt = v[i].ss;
        else if (px!=0)
        {
            int lc = v[i].ff*px/mcd(v[i].ff,px);   
            int c1 = lc/px;
            int c2 = lc/v[i].ff;
            fnt = c2*v[i].ss - c1*py;
        }
        y = mcd(v[i].ss,y);
        up = mcd(fnt,up);
        int add = 0;
        if (v[i].ss == 0)
            add = v[i].ff;
        else if (py!=0)
        {
            
            int lc = v[i].ss*py/mcd(v[i].ss,py);   
            int c1 = lc/py;
            int c2 = lc/v[i].ss;
            add = c2*v[i].ff - c1*px;
        }
        x = mcd(x,add);
        py = y;
        if (y)
            px = x-up/y;
        
    }
    if (x*y == 0)
        cout << -1;
    else
        cout << abs(x*y);
    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