Cod sursa(job #2783789)
Utilizator | Botnaru Victor Botnaru_Victor | Data | 15 octombrie 2021 08:38:46 |
---|---|---|---|
Problema | Aria | Scor | 100 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva educationala | Marime | 0.47 kb |
#include <bits/stdc++.h>
#define x first
#define y second
#define ld long double
using namespace std;
ifstream f("aria.in");
ofstream g("aria.out");
pair<ld,ld> pt[100001];
int n;
ld mn=0,s=0;
int main()
{
f>>n;
for(int i=0;i<n;i++){
f>>pt[i].x>>pt[i].y;
mn=min(mn,pt[i].y);
}
for(int i=0;i<n;i++)
{
int j=(i+1)%n;
s+=(double)((pt[i].y-mn+pt[j].y-mn)*(pt[i].x-pt[j].x))/2;
}
g<<fixed<<setprecision(10)<<s;
return 0;
}