Problem:
Score : 600 points

Problem Statement

Given are a sequence of N positive integers A_1, A_2, \ldots, A_N and another positive integer S.

For a non-empty subset T of the set \{1, 2, \ldots , N \}, let us define f(T) as follows:

f(T) is the number of different non-empty subsets \{x_1, x_2, \ldots , x_k \} of T such that A_{x_1}+A_{x_2}+\cdots +A_{x_k} = S.

Find the sum of f(T) over all 2^N-1 subsets T of \{1, 2, \ldots , N \}. Since the sum can be enormous, print it modulo 998244353.

Constraints

All values in input are integers.

1 \leq N \leq 3000

1 \leq S \leq 3000

1 \leq A_i \leq 3000

Input

Input is given from Standard Input in the following format:

N S
A_1 A_2 ... A_N

Output

Print the sum of f(T) modulo 998244353.

Sample Input 1

3 4
2 2 4

Sample Output 1

6

For each T, the value of f(T) is shown below. The sum of these values is 6.

f(\{1\}) = 0

f(\{2\}) = 0

f(\{3\}) = 1 (One subset \{3\} satisfies the condition.)

f(\{1, 2\}) = 1 (\{1, 2\})

f(\{2, 3\}) = 1 (\{3\})

f(\{1, 3\}) = 1 (\{3\})

f(\{1, 2, 3\}) = 2 (\{1, 2\}, \{3\})

Sample Input 2

5 8
9 9 9 9 9

Sample Output 2

0

Sample Input 3

10 10
3 1 4 1 5 9 2 6 5 3

Sample Output 3

3296

Solution in Rust (1.42.0) (judge verdict: Accepted)

const MOD: u32 = 998244353;

fn main() {
	let mut s = String::new();
	use std::io::Read;
	std::io::stdin().read_to_string(&mut s).unwrap();
	let mut it = s.split_whitespace();
	let n: usize = it.next().unwrap().parse().unwrap();
	let s: u32 = it.next().unwrap().parse().unwrap();
	let a: Vec<u32> = it.take(n).map(|a| a.parse().unwrap()).collect();

	let mut dp = vec![0; s as usize + 1];
	dp[0] = 1;
	for &a in a.iter() {
		let mut next = vec![0; s as usize + 1];
		for si in 0..=s {
			next[si as usize] = (next[si as usize] + 2 * dp[si as usize]) % MOD;
			if si + a <= s {
				next[(si + a) as usize] = (next[(si + a) as usize] + dp[si as usize]) % MOD;
			}
		}
		dp = next;
	}
	println!("{}", dp[s as usize]);
}