Problem:
Score : 600 points

Problem Statement

We have a set S of N points in a two-dimensional plane. The coordinates of the i-th point are (x_i, y_i). The N points have distinct x-coordinates and distinct y-coordinates.

For a non-empty subset T of S, let f(T) be the number of points contained in the smallest rectangle, whose sides are parallel to the coordinate axes, that contains all the points in T. More formally, we define f(T) as follows:

f(T) := (the number of integers i (1 \leq i \leq N) such that a \leq x_i \leq b and c \leq y_i \leq d, where a, b, c, and d are the minimum x-coordinate, the maximum x-coordinate, the minimum y-coordinate, and the maximum y-coordinate of the points in T)

Find the sum of f(T) over all non-empty subset T of S. Since it can be enormous, print the sum modulo 998244353.

Constraints

1 \leq N \leq 2 \times 10^5

-10^9 \leq x_i, y_i \leq 10^9

x_i \neq x_j (i \neq j)

y_i \neq y_j (i \neq j)

All values in input are integers.

Input

Input is given from Standard Input in the following format:

N
x_1 y_1
:
x_N y_N

Output

Print the sum of f(T) over all non-empty subset T of S, modulo 998244353.

Sample Input 1

3
-1 3
2 1
3 -2

Sample Output 1

13

Let the first, second, and third points be P_1, P_2, and P_3, respectively. S = \{P_1, P_2, P_3\} has seven non-empty subsets, and f has the following values for each of them:

f(\{P_1\}) = 1

f(\{P_2\}) = 1

f(\{P_3\}) = 1

f(\{P_1, P_2\}) = 2

f(\{P_2, P_3\}) = 2

f(\{P_3, P_1\}) = 3

f(\{P_1, P_2, P_3\}) = 3

The sum of these is 13.

Sample Input 2

4
1 4
2 1
3 3
4 2

Sample Output 2

34

Sample Input 3

10
19 -11
-3 -12
5 3
3 -15
8 -14
-9 -20
10 -9
0 2
-7 17
6 -6

Sample Output 3

7222

Be sure to print the sum modulo 998244353.

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

#[allow(unused_macros)]
macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        let mut iter = $s.split_whitespace();
        let mut next = || { iter.next().unwrap() };
        input_inner!{next, $($r)*}
    };
    ($($r:tt)*) => {
        let stdin = std::io::stdin();
        let mut bytes = std::io::Read::bytes(std::io::BufReader::new(stdin.lock()));
        let mut next = move || -> String{
            bytes
                .by_ref()
                .map(|r|r.unwrap() as char)
                .skip_while(|c|c.is_whitespace())
                .take_while(|c|!c.is_whitespace())
                .collect()
        };
        input_inner!{next, $($r)*}
    };
}

#[allow(unused_macros)]
macro_rules! input_inner {
    ($next:expr) => {};
    ($next:expr, ) => {};

    ($next:expr, $var:ident : $t:tt $($r:tt)*) => {
        let $var = read_value!($next, $t);
        input_inner!{$next $($r)*}
    };

    ($next:expr, mut $var:ident : $t:tt $($r:tt)*) => {
        let mut $var = read_value!($next, $t);
        input_inner!{$next $($r)*}
    };
}

#[allow(unused_macros)]
macro_rules! read_value {
    ($next:expr, ( $($t:tt),* )) => {
        ( $(read_value!($next, $t)),* )
    };

    ($next:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($next, $t)).collect::<Vec<_>>()
    };

    ($next:expr, chars) => {
        read_value!($next, String).chars().collect::<Vec<char>>()
    };

    ($next:expr, usize1) => {
        read_value!($next, usize) - 1
    };

    ($next:expr, $t:ty) => {
        $next().parse::<$t>().expect("Parse error")
    };
}

#[allow(unused_macros)]
macro_rules! debug {
    ($($a:expr),*) => {
        #[cfg(debug_assertions)]
        writeln!(&mut std::io::stderr(), concat!("[DEBUG] ", $(stringify!($a), "={:?} "),*), $($a),*);
    }
}

#[allow(unused_imports)]
use std::cmp::{min, max};
#[allow(unused_imports)]
use std::io::{stdout, stdin, BufWriter, Write};

pub mod ds {
    use std::ops::{AddAssign, Sub};
    #[derive(Debug)]
    pub struct BIT<T> {
        data: Vec<T>,
    }
    impl<T> BIT<T>
    where
        T: Copy + AddAssign + Sub<Output = T> + Default,
    {
        pub fn new(size: usize) -> Self {
            let buf_size = size.next_power_of_two();
            BIT {
                data: vec![T::default(); buf_size + 1],
            }
        }
        #[doc = " [l, r) l,r: 1-indexed"]
        pub fn range_sum(&self, l: usize, r: usize) -> T {
            self.sum(r - 1) - self.sum(l - 1)
        }
        #[doc = " i: 1-indexed but returns 0 if i=0 is given."]
        pub fn sum(&self, i: usize) -> T {
            let mut i = i as i64;
            let mut ret = T::default();
            while i > 0 {
                ret += self.data[i as usize];
                i -= i & -i;
            }
            ret
        }
        #[doc = " i: 1-indexed"]
        pub fn add(&mut self, i: usize, value: T) {
            assert!(i > 0);
            let n = self.data.len() as i64;
            let mut i = i as i64;
            while i <= n - 1 {
                self.data[i as usize] += value;
                i += i & -i;
            }
        }
    }
}

use ds::BIT;


const MOD: usize = 998244353;

pub fn mod_pow(b: usize, p: usize) -> usize {
    if p == 0 {
        return 1;
    }
    let mut ret = mod_pow(b * b % MOD, p / 2) % MOD;
    if p % 2 == 1 {
        ret = ret * b % MOD;
    }
    ret
}
pub fn inv(a: usize) -> usize {
    mod_pow(a, MOD - 2)
}

fn main() {
    let out = std::io::stdout();
    let mut out = BufWriter::new(out.lock());
    macro_rules! puts {
        ($($format:tt)*) => (write!(out,$($format)*).unwrap());
    }

    input!{
      n: usize,
      mut xys: [(i64,i64); n],
    }
    let mut ys: Vec<_> = xys.iter().map(|v|v.1).collect();
    ys.sort();
    ys.dedup();
    xys.sort_by_key(|v|v.0);

    let m = ys.len();
    let mut bit = BIT::new(m);

    let mut points = vec![vec![0; 4]; n];
    for i in 0..n {
        let (_, y) = xys[i];
        let idx = ys.binary_search(&y).unwrap() + 1;

        let v0 = bit.range_sum(idx+1, m+1);
        let v2 = bit.range_sum(1, idx);

        points[i][0] = v0;
        points[i][2] = v2;

        bit.add(idx, 1);
    }

    for i in 0..n {
        let (_, y) = xys[i];
        let idx = ys.binary_search(&y).unwrap() + 1;

        let v0 = points[i][0];
        let v2 = points[i][2];

        let v1 = bit.range_sum(idx+1, m+1) - v0;
        let v3 = bit.range_sum(1, idx) - v2;

        points[i][1] = v1;
        points[i][3] = v3;
    }

    let mut ans = 0;
    for i in 0..n {
        for a in 0..2 {
            for b in 0..2 {
                for c in 0..2 {
                    for d in 0..2 {
                        let k0 = points[i][0];
                        let k1 = points[i][1];
                        let k2 = points[i][2];
                        let k3 = points[i][3];

                        let mut temp = 1;
                        if a == 1 {
                            temp *= mod_pow(2, k0) - 1;
                            temp %= MOD;
                        }
                        if b == 1 {
                            temp *= mod_pow(2, k1) - 1;
                            temp %= MOD;
                        }
                        if c == 1 {
                            temp *= mod_pow(2, k2) - 1;
                            temp %= MOD;
                        }
                        if d == 1 {
                            temp *= mod_pow(2, k3) - 1;
                            temp %= MOD;
                        }

                        // 点Pを内部に含むときは、点Pを含まない部分集合の場合も加算する
                        if (a==1 && d==1) || (b==1 && c==1) {
                            temp *= 2;
                            temp %= MOD;
                        }
                        ans += temp;
                        ans %= MOD;
                    }
                }
            }
        }
    }
    puts!("{}\n", ans);
}