Problem:
Score : 300 points

Problem Statement

Given is an integer sequence D_1,...,D_N of N elements. Find the number, modulo 998244353, of trees with N vertices numbered 1 to N that satisfy the following condition:

For every integer i from 1 to N, the distance between Vertex 1 and Vertex i is D_i.

Notes

A tree of N vertices is a connected undirected graph with N vertices and N-1 edges, and the distance between two vertices are the number of edges in the shortest path between them.

Two trees are considered different if and only if there are two vertices x and y such that there is an edge between x and y in one of those trees and not in the other.

Constraints

1 \leq N \leq 10^5

0 \leq D_i \leq N-1

Input

Input is given from Standard Input in the following format:

N
D_1 D_2 ... D_N

Output

Print the answer.

Sample Input 1

4
0 1 1 2

Sample Output 1

2

For example, a tree with edges (1,2), (1,3), and (2,4) satisfies the condition.

Sample Input 2

4
1 1 1 1

Sample Output 2

0

Sample Input 3

7
0 3 2 1 2 2 1

Sample Output 3

24

Solution in Python (3.4.3) (judge verdict: Runtime Error)

import sys
from collections import Counter

n = int(input())
arr = list(map(int, input().split()))

c = list(Counter(arr).items())

c.sort()

if c[0][0] != 0 or c[0][1] != 1:
    print(0)
    sys.exit()

prev_k = 0
prev_v = 1
ans = 1
mod = 998244353
for k, v in c[1:]:
    if k - prev_k > 1:
        print(0)
        sys.exit()
    else:
        ans *= pow(prev, i) % mod
        ans %= mod
        prev_k = k
        prev_v = v

print(ans)