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 Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import java.util.NoSuchElementException;
import java.util.Objects;
import java.util.function.IntUnaryOperator;
import java.util.function.LongUnaryOperator;


public class Main {
    public static void main(String[] args) {
        Const.setMod(Const.MOD99);
        FastScanner fsc = new FastScanner();
        int n = fsc.nextInt();
        long[][] xy = new long[2][n];
        for (int i = 0; i < n; i++) {
            long x = fsc.nextLong();
            long y = fsc.nextLong();
            xy[0][i] = x;
            xy[1][i] = y;
        }
        int[] x = ArrayUtil.compress(xy[0]);
        int[] y = ArrayUtil.compress(xy[1]);
        Pair<Integer, Integer>[] p = new Pair[n];
        for (int i = 0; i < n; i++) {
            p[i] = new Pair<>(x[i], y[i]);
        }
        Arrays.sort(p, (u, v) -> u.key - v.key);
        int[][] k = new int[4][n];
        BinaryIndexedTree t = new BinaryIndexedTree(0, n);
        for (int i = 0; i < n; i++) {
            int b = t.sum(p[i].val, n);
            int c = t.sum(p[i].val);
            k[1][i] = b;
            k[2][i] = c;
            t.add(p[i].val, 1);
        }
        t = new BinaryIndexedTree(0, n);
        for (int i = n - 1; i >= 0; i--) {
            int a = t.sum(p[i].val, n);
            int d = t.sum(p[i].val);
            k[0][i] = a;
            k[3][i] = d;
            t.add(p[i].val, 1);
        }
        long[] pow = ModUtil.powarr(2l, n);
        long ans = ModUtil.mul(n, pow[n - 1]);
        for (int i = 0; i < n; i++) {
            int a = k[0][i];
            int b = k[1][i];
            int c = k[2][i];
            int d = k[3][i];
            long add = 0;
            add += pow[n - 1] - ModUtil.mul(pow[b], pow[d], ModUtil.add(pow[a], pow[c], -1));
            add += pow[n - 1] - ModUtil.mul(pow[a], pow[c], ModUtil.add(pow[b], pow[d], -1));
            long is = 0;
            for (int j = 1; j < (1 << 4); j++) {
                int sign = (Integer.bitCount(j) & 1) != 0 ? 1 : -1;
                long tm = 1;
                for (int bit = 0; bit < 4; bit++) {
                    if ((j & (1 << bit)) == 0) {
                        tm = ModUtil.mul(tm, pow[k[bit][i]]);
                    }
                }
                tm--;
                is += tm * sign;
            }
            is = pow[n - 1] - 1 - is;
            add = ModUtil.mod(add - is);
            ans += add;
        }
        System.out.println(ModUtil.mod(ans));
    }
}

/**
 * BinaryIndexedTree(n=10): [         8          ]
 *                          [    4    ] 
 *                          [ 2 ]      [ 6 ]      [ 10 ]
 *                          [1]  [3]   [5]  [7]   [9]
 * 
 * original array: (1, 2, 3, 4, 5, 6, 7, 8, 9, 10)
 * 
 * if you want to get the sum of range (l, r], caluculate S(r)-S(l). (S(n) means
 * \sum_{i=1}^n array[i].)
 * 
 * then, you need to be able to calculate S(n) quickly. actually, you can.
 * 
 * 1. binarize n. Ex: n=5(10)=101(2). 2. decompose
 * n=2**p_1+2**p_2+...+2**p_m.(p_1<...<p_m) Ex: n=1+100. 3. acutually,
 * S(n)=\sum_{i=1}^m{tree[\sum_{j=i}^m 2**p_j]} Ex: S(n)=tree[101]+tree[100].
 * 
 * computational complexity of sum-query is O(log n).
 */

class BinaryIndexedTree {
    private int[] tree;
    private int[] originalArray;
    private int n;

    /**
     * @param array 0-indexed array.
     */
    public BinaryIndexedTree(int[] array) {
        this.originalArray = array.clone();
        this.n = array.length;
        this.tree = new int[n + 1];
        initTree();
    }

    public BinaryIndexedTree(int initial, int n) {
        this.originalArray = new int[n];
        this.n = n;
        this.tree = new int[n + 1];
        for (int i = 0; i < n; i++) {
            originalArray[i] = initial;
        }
        initTree();
    }

    public BinaryIndexedTree(int n) {
        this(0, n);
    }

    private void initTree() {
        for (int i = 1; i <= n; i++) {
            tree[i] += originalArray[i - 1];
            int parent = i + (-i & i);
            if (parent <= n) {
                tree[parent] += tree[i];
            }
        }
    }

    /**
     * Calculate the sum of range (l, r] in array (1-indexed).
     * 
     * @param l left border (open)
     * @param r right border (closed)
     * @return sum of range (l, r] in array (1-indexed).
     */
    public int sum(int l, int r) {
        return sum(r) - sum(l);
    }

    public int sum(int r) {
        int ret = 0;
        for (; r > 0; r -= -r & r) {
            ret += tree[r];
        }
        return ret;
    }

    public int sum() {
        return sum(n);
    }

    /**
     * add v to array[i] and update BIT.
     * 
     * @param i index of array (1-indexed)
     * @param v adding value
     */
    public void add(int i, int v) {
        originalArray[i - 1] += v;
        for (; i <= n; i += -i & i) {
            tree[i] += v;
        }
    }

    /**
     * update the value of array[i] to v and update BIT.
     * 
     * @param i index of array (1-indexed)
     * @param v adding value
     */
    public void update(int i, int v) {
        add(i, v - originalArray[i - 1]);
        originalArray[i] = v;
    }

    @Override
    public String toString() {
        int msb = 31 - Integer.numberOfLeadingZeros(n);
        char[][] c = new char[msb + 1][1 << (2 * msb + 1)];
        int[] indx = new int[msb + 1];
        for (int i = 1; i <= n; i++) {
            int j = Integer.numberOfTrailingZeros(-i & i);
            char[] intc = Integer.toString(tree[i]).toCharArray();
            int intl = intc.length;
            c[j][indx[j]] = '[';
            c[j][indx[j] + (1 << (j + 2)) - 1] = ']';
            int st = indx[j] + (1 << (j + 1)) - intl / 2 - 1;
            for (int l = 0; l < intl; l++) {
                c[j][st + l] = intc[l];
            }
            indx[j] += 1 << (j + 3);
        }
        StringBuilder sb = new StringBuilder();
        for (int i = msb; i >= 0; i--){
            sb.append(String.valueOf(c[i])).append('\n');
        }
        return sb.toString();
    }
}


class FastScanner {
    private final InputStream in = System.in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;

    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        } else {
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    }

    private int readByte() {
        if (hasNextByte()) {
            return buffer[ptr++];
        } else {
            return -1;
        }
    }

    private static boolean isPrintableChar(int c) {
        return 33 <= c && c <= 126;
    }

    public boolean hasNext() {
        while (hasNextByte() && !isPrintableChar(buffer[ptr])) {
            ptr++;
        }
        return hasNextByte();
    }

    public String next() {
        if (!hasNext()) {
            throw new NoSuchElementException();
        }
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while (isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }

    public long nextLong() {
        if (!hasNext()) {
            throw new NoSuchElementException();
        }
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while (true) {
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            } else if (b == -1 || !isPrintableChar(b)) {
                return minus ? -n : n;
            } else {
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }

    public int nextInt() {
        long nl = nextLong();
        if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) {
            throw new NumberFormatException();
        }
        return (int) nl;
    }

    public double nextDouble() {
        return Double.parseDouble(next());
    }
}

class ModUtil {
    private static final long MOD = Const.MOD;

    public static long mod(long a) {
        a %= MOD;
        if (a < 0) a += MOD;
        return a;
    }

    public static long add(long... a) {
        long ret = 0;
        for (long c : a) ret += c;
        return mod(ret);
    }

    public static long add(long a, long b) {
        long s = a + b;
        return s >= Const.MOD ? s - Const.MOD : s;
    }

    public static long mul(long... a) {
        long ret = 1;
        for (long c : a) ret = (ret * c) % MOD;
        return ret;
    }

    public static long mul(long a, long b) {
        return (a * b) % Const.MOD;
    }

    public static long div(long a, long... b) {
        long ret = a;
        for (long c : b) ret = mul(ret, inv(c));
        return ret;
    }

    /**
     * Caluculate the value b s.t. a*b mod MOD = 1.
     * 
     * @param a
     * @return inverse of a
     */
    public static long inv(long a) {
        long b = MOD;
        long u = 1, v = 0;
        while (b >= 1) {
            long t = a / b;
            a -= t * b;
            long tmp1 = a; a = b; b = tmp1;
            u -= t * v;
            long tmp2 = u; u = v; v = tmp2;
        }
        u %= MOD;
        return u >= 0 ? u : u + MOD;
    }

    /**
     * Caluculate the combination nCr.
     * 
     * @param n left
     * @param r right
     * @return nCr
     */
    public static long comb(long n, long r) {
        if (n < r) return 0;
        r = Math.min(r, n - r);
        long res = 1;
        for (long d = 1; d <= r; d++) res = div(mul(res, n--), d);
        return res;
    }

    public static long[] fact(int n) {
        long[] fact = new long[n + 1];
        for (int i = 0; i <= n; i++) {
            if (i <= 1) {
                fact[i] = 1;
            } else {
                fact[i] = mul(fact[i - 1], i);
            }
        }
        return fact;
    }

    public static long[] powarr(long a, int n) {
        long[] ret = new long[n + 1];
        for (int i = 0; i <= n; i++) {
            if (i == 0) {
                ret[i] = 1;
            } else {
                ret[i] = mul(ret[i - 1], a);
            }
        }
        return ret;
    }

    /**
     * Caluculate a^b (mod {@code MOD}) in O(log b) time.
     * 
     * @param a base
     * @param b index
     * @return a^b (mod {@code MOD})
     */
    public static long pow(long a, long b) {
        if (b == 0) {
            return 1;
        }
        long half = pow(a, b >> 1);
        if ((a & 1) == 0) {
            return mul(half, half);
        } else {
            return mul(half, half, a);
        }
    }
}


class Pair<K, V> {
    public K key;
    public V val;

    public Pair(K key, V val) {
        this.key = key;
        this.val = val;
    }

    @Override @SuppressWarnings("all")
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        } else if (!(o instanceof Pair)) {
            return false;
        } else {
            Pair p = (Pair) o;
            return this.key.equals(p.key) && this.val.equals(p.val);
        }
    }

    @Override
    public int hashCode() {
        return Objects.hash(this.key, this.val);
    }

    @Override
    public String toString() {
        return "(" + this.key.toString() + ", " + this.val.toString() + ")";
    }
}

class Const {
    public static final long MOD7 = 1_000_000_007;
    public static final long MOD9 = 1_000_000_009;
    public static final long MOD99 = 998_244_353;

    public static final long LINF = 1_000_000_000_000_000_000l;
    public static final int IINF = 1_000_000_000;
    public static final double DINF = 1e150;

    public static final double DELTA = 0.000_000_000_1;
    public static final double LDELTA = 0.000_001;

    public static final String YES = "YES";
    public static final String NO = "NO";
    public static final String Yes = "Yes";
    public static final String No = "No";
    public static final String POSSIBLE = "POSSIBLE";
    public static final String IMPOSSIBLE = "IMPOSSIBLE";
    public static final String Possible = "Possible";
    public static final String Impossible = "Impossible";

    public static final int[] dx8 = {1, 0, -1, 0, 1, -1, -1, 1};
    public static final int[] dy8 = {0, 1, 0, -1, 1, 1, -1, -1};
    public static final int[] dx = {1, 0, -1, 0};
    public static final int[] dy = {0, 1, 0, -1};

    public static long MOD = MOD7;

    public static void setMod(long mod) {
        MOD = mod;
    }

    private Const(){}
}


class ArrayUtil {
    private ArrayUtil(){}
    
    public static int[] map(IntUnaryOperator op, int[] a) {
        int[] b = new int[a.length];
        for (int i = 0; i < a.length; i++) {
            b[i] = op.applyAsInt(a[i]);
        }
        return b;
    }

    /**
     * s[i] is the sum of the range [0, i) in a.
     * 
     * @param a
     * @return cumulative sum array of a.
     */
    public static int[] cumsum(int[] a) {
        int n = a.length;
        int[] s = new int[n + 1];
        for (int i = 1; i <= n; i++) {
            s[i] = s[i - 1] + a[i - 1];
        }
        return s;
    }

    public static int[][] cumsum(int[][] a) {
        int n = a.length;
        int m = a[0].length;
        int[][] s = new int[n + 1][m + 1];
        for (int i = 1; i <= n; i++) {
            for (int j = 1; j <= m; j++){
                s[i][j] = s[i - 1][j] + s[i][j - 1] - s[i - 1][j - 1] + a[i - 1][j - 1];
            }
        }
        return s;
    }

    public static void reverse(int[] a, int begin, int end) {
        for (int i = begin; i < begin + (end - begin) / 2; i++) {
            swap(a, i, begin + end - i - 1);
        }
    }

    public static void reverse(int[] a) {
        reverse(a, 0, a.length);
    }

    public static void revSort(int[] a) {
        Arrays.sort(a);
        reverse(a);
    }

    public static int[] nextPermutation(int[] a) {
        int[] ret = a.clone();
        int n = ret.length;
        for (int i = n - 1; i >= 1; i--) {
            if (ret[i] > ret[i - 1]) {
                int fail = n, pass = i;
                while (fail - pass > 1) {
                    int mid = pass + (fail - pass) / 2;
                    if (ret[mid] > ret[i - 1]) {
                        pass = mid;
                    } else {
                        fail = mid;
                    }
                }
                swap(ret, pass, i - 1);
                reverse(ret, i, n);
                return ret;
            }
        }
        return null;
    }

    public static int[] predPermutation(int[] a) {
        int[] ret = a.clone();
        int n = ret.length;
        for (int i = n - 1; i >= 1; i--) {
            if (ret[i] < ret[i - 1]) {
                int fail = n, pass = i;
                while (fail - pass > 1) {
                    int mid = pass + (fail - pass) / 2;
                    if (ret[mid] < ret[i - 1]) {
                        pass = mid;
                    } else {
                        fail = mid;
                    }
                }
                swap(ret, pass, i - 1);
                reverse(ret, i, n);
                return ret;
            }
        }
        return null;
    }

    public static void swap(int[] a, int u, int v) {
        int tmp = a[u];
        a[u] = a[v];
        a[v] = tmp;
    }

    public static int compare(int[] a, int[] b) {
        for (int i = 0; i < a.length; i++) {
            if (i >= b.length) {
                return -1;
            } else if (a[i] > b[i]) {
                return 1;
            } else if (a[i] < b[i]) {
                return -1;
            }
        }
        if (a.length < b.length) {
            return 1;
        } else {
            return 0;
        }
    }

    public static boolean equals(int[] a, int[] b) {
        return compare(a, b) == 0;
    }

    public static void println(int[] a, char sep) {
        StringBuilder sb = new StringBuilder();
        for (int e : a) {
            sb.append(e).append(sep);
        }
        System.out.println(sb);
    }

    public static void println(int[] a) {
        println(a, '\n');
    }

    /*
     * IntArray _________________________ LongArray
     */
    public static long[] map(LongUnaryOperator op, long[] a) {
        long[] b = new long[a.length];
        for (int i = 0; i < a.length; i++) {
            b[i] = op.applyAsLong(a[i]);
        }
        return b;
    }

    /**
     * s[i] is the sum of the range [0, i) in a.
     * 
     * @param a
     * @return cumulative sum array of a.
     */
    public static long[] cumsum(long[] a) {
        int n = a.length;
        long[] s = new long[n + 1];
        for (int i = 1; i <= n; i++) {
            s[i] = s[i - 1] + a[i - 1];
        }
        return s;
    }

    public static long[][] cumsum(long[][] a) {
        int n = a.length;
        int m = a[0].length;
        long[][] s = new long[n + 1][m + 1];
        for (int i = 1; i <= n; i++) {
            for (int j = 1; j <= m; j++) {
                s[i][j] = s[i - 1][j] + s[i][j - 1] - s[i - 1][j - 1] + a[i - 1][j - 1];
            }
        }
        return s;
    }

    public static void reverse(long[] a, int begin, int end) {
        for (int i = begin; i < begin + (end - begin) / 2; i++) {
            swap(a, i, begin + end - i - 1);
        }
    }

    public static void reverse(long[] a) {
        reverse(a, 0, a.length);
    }

    public static void revSort(long[] a) {
        Arrays.sort(a);
        reverse(a);
    }

    public static int[] compress(long[] a) {
        int n = a.length;
        long[] sorted = a.clone();
        int[] compress = new int[n];
        Arrays.sort(sorted);
        for (int i = 0; i < n; i++) {
            int l = 0, r = n;
            while (r - l > 1) {
                int m = l + (r - l) / 2;
                if (sorted[m] <= a[i]) {
                    l = m;
                } else {
                    r = m;
                }
            }
            compress[i] = l + 1;
        }
        return compress;
    }

    public static void swap(long[] a, int u, int v) {
        long tmp = a[u];
        a[u] = a[v];
        a[v] = tmp;
    }

    public static int compare(long[] a, long[] b) {
        for (int i = 0; i < a.length; i++) {
            if (i >= b.length) {
                return -1;
            } else if (a[i] > b[i]) {
                return 1;
            } else if (a[i] < b[i]) {
                return -1;
            }
        }
        if (a.length < b.length) {
            return 1;
        } else {
            return 0;
        }
    }

    public static boolean equals(long[] a, long[] b) {
        return compare(a, b) == 0;
    }

    public static void println(long[] a, char sep) {
        StringBuilder sb = new StringBuilder();
        for (long e : a) {
            sb.append(e).append(sep);
        }
        System.out.println(sb);
    }

    public static void println(long[] a) {
        println(a, '\n');
    }

    /*
     * other Array
     */
    public static void println(double[] a, char sep) {
        StringBuilder sb = new StringBuilder();
        for (double e : a) {
            sb.append(e).append(sep);
        }
        System.out.println(sb);
    }

    public static void println(double[] a) {
        println(a, '\n');
    }

    public static void println(char[] s) {
        System.out.println(s);
    }

    public static void println(char[][] s) {
        StringBuilder sb = new StringBuilder();
        for (char[] c : s) {
            sb.append(c).append('\n');
        }
        System.out.print(sb);
    }

    public static <T> void println(T[] a, char sep) {
        StringBuilder sb = new StringBuilder();
        for (T e : a) {
            sb.append(e).append(sep);
        }
        System.out.print(sb);
    }

    public static <T> void println(T[] a) {
        println(a, '\n');
    }

    public static boolean[][] inputGrid(FastScanner fsc, int h, int w, char t) {
        boolean[][] grid = new boolean[h][w];
        for (int i = 0; i < h; i++) {
            char[] s = fsc.next().toCharArray();
            for (int j = 0; j < w; j++) {
                grid[i][j] = s[j] == t;
            }
        }
        return grid;
    }

    public static boolean[][] inputGrid(FastScanner fsc, int h, int w) {
        return inputGrid(fsc, h, w, '#');
    }

    public static boolean[][] inputGrid(FastScanner fsc, int n) {
        return inputGrid(fsc, n, n, '#');
    }

    public static boolean[][] inputGrid(FastScanner fsc, int n, char t) {
        return inputGrid(fsc, n, n, t);
    }
}