Problem:
Score : 600 points

Problem Statement

There are N points in a two-dimensional plane. The initial coordinates of the i-th point are (x_i, y_i). Now, each point starts moving at a speed of 1 per second, in a direction parallel to the x- or y- axis. You are given a character d_i that represents the specific direction in which the i-th point moves, as follows:

If d_i = R, the i-th point moves in the positive x direction;

If d_i = L, the i-th point moves in the negative x direction;

If d_i = U, the i-th point moves in the positive y direction;

If d_i = D, the i-th point moves in the negative y direction.

You can stop all the points at some moment of your choice after they start moving (including the moment they start moving).
Then, let x_{max} and x_{min} be the maximum and minimum among the x-coordinates of the N points, respectively. Similarly, let y_{max} and y_{min} be the maximum and minimum among the y-coordinates of the N points, respectively.

Find the minimum possible value of (x_{max} - x_{min}) \times (y_{max} - y_{min}) and print it.

Constraints

1 \leq N \leq 10^5

-10^8 \leq x_i,\ y_i \leq 10^8

x_i and y_i are integers.

d_i is R, L, U, or D.

Input

Input is given from Standard Input in the following format:

N
x_1 y_1 d_1
x_2 y_2 d_2
.
.
.
x_N y_N d_N

Output

Print the minimum possible value of (x_{max} - x_{min}) \times (y_{max} - y_{min}).

The output will be considered correct when its absolute or relative error from the judge's output is at most 10^{-9}.

Sample Input 1

2
0 3 D
3 0 L

Sample Output 1

0

After three seconds, the two points will meet at the origin. The value in question will be 0 at that moment.

Sample Input 2

5
-7 -10 U
7 -6 U
-8 7 D
-3 3 D
0 -6 R

Sample Output 2

97.5

The answer may not be an integer.

Sample Input 3

20
6 -10 R
-4 -9 U
9 6 D
-3 -2 R
0 7 D
4 5 D
10 -10 U
-1 -8 U
10 -6 D
8 -5 U
6 4 D
0 3 D
7 9 R
9 -4 R
3 10 D
1 9 U
1 -6 U
9 -8 R
6 7 D
7 -3 D

Sample Output 3

273

Solution in Rust (1.15.1) (judge verdict: Accepted)

fn main() {
    let (r, w) = (std::io::stdin(), std::io::stdout());
    let mut sc = IO::new(r.lock(), w.lock());
    let n: usize = sc.read();

    let mut left = State::new();
    let mut right = State::new();
    let mut top = State::new();
    let mut bottom = State::new();

    for _ in 0..n {
        let x: f64 = sc.read();
        let y: f64 = sc.read();
        let c = sc.chars()[0];
        match c {
            'R' => {
                set_max(&mut right.increasing, x);
                set_max(&mut left.decreasing, -x);
                set_max(&mut top.solid, y);
                set_max(&mut bottom.solid, -y);
            }
            'L' => {
                set_max(&mut right.decreasing, x);
                set_max(&mut left.increasing, -x);
                set_max(&mut top.solid, y);
                set_max(&mut bottom.solid, -y);
            }
            'U' => {
                set_max(&mut right.solid, x);
                set_max(&mut left.solid, -x);
                set_max(&mut top.increasing, y);
                set_max(&mut bottom.decreasing, -y);
            }
            'D' => {
                set_max(&mut right.solid, x);
                set_max(&mut left.solid, -x);
                set_max(&mut top.decreasing, y);
                set_max(&mut bottom.increasing, -y);
            }
            _ => unreachable!(),
        }
    }

    let mut events = vec![];
    events.extend(right.get_event());
    events.extend(left.get_event());
    events.extend(top.get_event());
    events.extend(bottom.get_event());
    events.push(0.0);

    let mut ans = std::f64::MAX;
    for e in events.into_iter() {
        let right = right.get(e);
        let left = -left.get(e);
        let top = top.get(e);
        let bottom = -bottom.get(e);

        let dx = right - left;
        let dy = top - bottom;
        let area = dx.abs() * dy.abs();
        if ans > area {
            ans = area;
        }
    }

    println!("{}", ans);
}

fn set_max(x: &mut Option<f64>, v: f64) {
    match x.clone() {
        Some(t) => {
            if t < v {
                *x = Some(v)
            }
        }
        None => *x = Some(v),
    }
}

struct State {
    increasing: Option<f64>,
    decreasing: Option<f64>,
    solid: Option<f64>,
}

impl State {
    fn new() -> State {
        State {
            increasing: None,
            decreasing: None,
            solid: None,
        }
    }

    fn get_event(&self) -> Vec<f64> {
        let mut events = vec![];
        if let (Some(increasing), Some(decreasing)) = (self.increasing, self.decreasing) {
            let d = decreasing - increasing;
            if d >= 0.0 {
                events.push(d / 2.0);
            }
        }
        if let (Some(increasing), Some(solid)) = (self.increasing, self.solid) {
            let d = solid - increasing;
            if d >= 0.0 {
                events.push(d);
            }
        }
        if let (Some(solid), Some(decreasing)) = (self.solid, self.decreasing) {
            let d = decreasing - solid;
            if d >= 0.0 {
                events.push(d);
            }
        }
        events
    }

    fn get(&self, t: f64) -> f64 {
        let mut ans = std::f64::MIN;
        if let Some(increasing) = self.increasing {
            ans = ans.max(increasing + t);
        }
        if let Some(decreasing) = self.decreasing {
            ans = ans.max(decreasing - t);
        }
        if let Some(solid) = self.solid {
            ans = ans.max(solid);
        }
        ans
    }
}

pub struct IO<R, W: std::io::Write>(R, std::io::BufWriter<W>);

impl<R: std::io::Read, W: std::io::Write> IO<R, W> {
    pub fn new(r: R, w: W) -> IO<R, W> {
        IO(r, std::io::BufWriter::new(w))
    }
    pub fn write<S: std::ops::Deref<Target = str>>(&mut self, s: S) {
        use std::io::Write;
        self.1.write(s.as_bytes()).unwrap();
    }
    pub fn read<T: std::str::FromStr>(&mut self) -> T {
        use std::io::Read;
        let buf = self
            .0
            .by_ref()
            .bytes()
            .map(|b| b.unwrap())
            .skip_while(|&b| b == b' ' || b == b'\n' || b == b'\r' || b == b'\t')
            .take_while(|&b| b != b' ' && b != b'\n' && b != b'\r' && b != b'\t')
            .collect::<Vec<_>>();
        unsafe { std::str::from_utf8_unchecked(&buf) }
            .parse()
            .ok()
            .expect("Parse error.")
    }
    pub fn vec<T: std::str::FromStr>(&mut self, n: usize) -> Vec<T> {
        (0..n).map(|_| self.read()).collect()
    }
    pub fn chars(&mut self) -> Vec<char> {
        self.read::<String>().chars().collect()
    }
}