Problem F
Largest Triangle
Given $N$ points on a $2$-dimensional space, determine the area of the largest triangle that can be formed using $3$ of those $N$ points. If there is no triangle that can be formed, the answer is $0$.
Input
The first line contains an integer $N$ ($3 \le N \le 5\, 000$) denoting the number of points. Each of the next $N$ lines contains two integers $x$ and $y$ ($0 \leq x, y \leq 4 \cdot 10^7$). There are no specific constraints on these $N$ points, i.e. the points are not necessarily distinct, the points are not given in specific order, there may be $3$ or more collinear points, etc.
Output
Print the answer in one line. Your answer should have an absolute error of at most $10^{-5}$.
Sample Input 1 | Sample Output 1 |
---|---|
7 0 0 0 5 7 7 0 10 0 0 20 0 10 10 |
100.00000 |