Submission #1521177

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Source Code Expand

import math,string,itertools,fractions,heapq,collections,re,array,bisect,sys,random,time,copy,functools

sys.setrecursionlimit(10**7)
inf = 10**20
gosa = 1.0 / 10**10
mod = 10**9 + 7

def LI(): return [int(x) for x in sys.stdin.readline().split()]
def LI_(): return [int(x)-1 for x in sys.stdin.readline().split()]
def LF(): return [float(x) for x in sys.stdin.readline().split()]
def LS(): return sys.stdin.readline().split()
def I(): return int(sys.stdin.readline())
def F(): return float(sys.stdin.readline())
def S(): return input()


def main():
    n = I()
    a = LI()
    r = 1
    c = 0
    for b in a:
        if b <= c * 2:
            r *= c+1
            r %= mod
        else:
            c += 1
    for b in range(2,c+1):
        r *= b
        r %= mod

    return r


print(main())

Submission Info

Judge Result