| # | Time | Username | Problem | Language | Result | Execution time | Memory |
|---|---|---|---|---|---|---|---|
| 1044044 | guagua0407 | Portal (BOI24_portal) | C++17 | 0 ms | 0 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
//#pragma GCC optimize("O3")
#include <bits/stdc++.h>
using namespace std;
#define ll __int128
#define pii pair<int,int>
#define f first
#define s second
#define all(x) x.begin(),x.end()
#define _ ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
int dx[4]={0,0,1,-1};
int dy[4]={1,-1,0,0};
void setIO(string s) {
freopen((s + ".in").c_str(), "r", stdin);
freopen((s + ".out").c_str(), "w", stdout);
}
int main() {_
int n;
cin>>n;
if(n<=2){
cout<<-1<<'\n';
return 0;
}
pair<ll,ll> st,a,b;
int x,y;
cin>>x>>y;
st.f=x,st.s=y;
cin>>x>>y;
a.f=x,a.s=y;
a.f-=st.f;
a.s-=st.s;
if(a.f<0){
a.f*=-1;
a.s*=-1;
}
vector<ll> ys;
auto go=[&](){
if(a.f<b.f) swap(a,b);
while(b.f!=0){
ll c=a.f/b.f;
a.f-=c*b.f;
a.s-=c*b.s;
if(a.f<b.f) swap(a,b);
}
ys.push_back(abs(b.s));
};
for(int i=0;i<n-2;i++){
cin>>x>>y;
b.f=x,b.s=y;
b.f-=st.f;
b.s-=st.s;
if(b.f<0){
b.f*=-1;
b.s*=-1;
}
go();
}
ll g=ys[0];
for(int i=1;i<(int)ys.size();i++){
g=__gcd(g,ys[i]);
}
ll ans=abs(g*a.f);
cout<<(ans==0?-1:(long long)ans)<<'\n';
return 0;
}
//maybe its multiset not set
//yeeorz
//laborz