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 C (Clang 3.8.0) (judge verdict: Time Limit Exceeded)

#include <stdio.h>
#include <string.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
int acs(const void *a, const void *b){return *(int*)a - *(int*)b;} /* 1,2,3,4.. */
int des(const void *a, const void *b){return *(int*)b - *(int*)a;} /* 8,7,6,5.. */

#define MOD (998244353)

// BIT
typedef int BIT_T;
BIT_T* bit;
int bitN;
void BITinit(int n)
{
    bitN = n;
    bit = (BIT_T*)malloc( (bitN+1)*sizeof(BIT_T));
}

void BITadd(int i,BIT_T val)
{
    for(;i<=bitN;i+=i&-i) bit[i]+=val;
}

BIT_T BITget(int i)
{
    BIT_T val = 0;
    for(;i;i-=i&-i) val += bit[i];
    return val;
}

void BITreset(void)
{
    memset(bit, 0, sizeof(BIT_T)*(bitN+1));
}

typedef struct 
{
    int x;
    int y;
}P;

int acsY(const void *a, const void *b){return ((P*)a)->y - ((P*)b)->y;} /* 1,2,3,4.. */
int acsX(const void *a, const void *b){return ((P*)a)->x - ((P*)b)->x;} /* 1,2,3,4.. */

// 2^n-1 % MOD
uint64_t getC(int n)
{
    uint64_t c;
    c = 1;
    for(int i=0;i<n;i++) c = (c*2) % MOD;
    return (c + MOD -1) % MOD;
}

P ps[200000];
int a[200000]={0};
int b[200000]={0};
int c[200000]={0};
int d[200000]={0};

int main(void)
{
    int n;
    uint64_t sum;
    scanf("%d",&n);
    
    for(int i=0;i<n;i++)scanf("%d %d", &(ps[i].x), &(ps[i].y));
    qsort(ps, n, sizeof(P), acsY);
    int j=1;
    for(int i=0;i<n;i++) ps[i].y = j++;
    qsort(ps, n, sizeof(P), acsX);
        
    //BA
    //CD
    BITinit(n);
    for(int i=0;i<n;i++)
    {
        int g = BITget(ps[i].y);
        b[i] += g;
        c[i] += i-g;
        BITadd(ps[i].y,1);
    }
    BITreset();
    for(int i=n-1;i>=0;i--)
    {
        int g = BITget(ps[i].y);
        a[i] += g;
        d[i] += (n-1-i)-g;
        BITadd(ps[i].y,1);
    }

    uint64_t t;
    t = 0;
    for(int i=0;i<n;i++)
    {
        // ABCD
        // ABC
        // AB D
        // A CD
        //  BCD
        //  B D
        // A C
        uint64_t ca = getC(a[i]);
        uint64_t cb = getC(b[i]);
        uint64_t cc = getC(c[i]);
        uint64_t cd = getC(d[i]);
        t += (((((ca * cb)%MOD)*cc)%MOD)*cd)%MOD;
        t %= MOD;
        t += ((((ca * cb)%MOD)*cc)%MOD);
        t %= MOD;
        t += ((((ca * cb)%MOD)*cd)%MOD);
        t %= MOD;
        t += ((((ca * cc)%MOD)*cd)%MOD);
        t %= MOD;
        t += ((((cb * cc)%MOD)*cd)%MOD);
        t %= MOD;
        t += (cb * cd)%MOD;
        t %= MOD;
        t += (ca * cc)%MOD;
        t %= MOD;
        //自分を含む組み合わせ
        t += getC(n-1)+1;
        t %= MOD;
    }
    printf("%ld\n", t);
    
    return 0;
}