Score : $800$ points

Problem Statement

$N$ people called Person $1, 2, \ldots, N$ are standing in a circle.

For each $1 \leq i \leq N-1$, Person $i$'s neighbor to the right is Person $i+1$, and Person $N$'s neighbor to the right is Person $1$.

Person $i$ initially has $a_i$ balls.

They will do the following procedure just once.

• Each person chooses some (possibly zero) of the balls they have.
• Then, each person simultaneously hands the chosen balls to the neighbor to the right.
• Now, make a sequence of length $N$, where the $i$-th term is the number of balls Person $i$ has at the moment.

Let $S$ be the set of all sequences that can result from the procedure. For example, when $a=(1,1,1)$, we have $S= \{(0,1,2),(0,2,1),(1,0,2),(1,1,1),(1,2,0),(2,0,1),(2,1,0) \}$.

Compute $\sum_{x \in S} \prod_{i=1}^{N} x_i$, modulo $998244353$.

Constraints

• All values in input are integers.
• $3 \leq N \leq 10^5$
• $0 \leq a_i \leq 10^9$

Input

Input is given from Standard Input in the following format:

$N$

$a_{1}$ $a_{2}$ $\cdots$ $a_{N}$

Output

Print $\sum_{x \in S} \prod_{i=1}^{N} x_i$, modulo $998244353$.

3
1 1 1

1

• We have $S= \{(0,1,2),(0,2,1),(1,0,2),(1,1,1),(1,2,0),(2,0,1),(2,1,0) \}$.
• $\sum_{x \in S} \prod_{i=1}^{N} x_i$ is $1$.

3
2 1 1

6

20
5644 493 8410 8455 7843 9140 3812 2801 3725 6361 2307 1522 1177 844 654 6489 3875 3920 7832 5768

864609205

• Be sure to compute it modulo $998244353$.