うむ。結局、階乗で行けるのでは？
樹形図としては並び替えれば行けるんじゃね？
。。行けた。
NotEqual.py
n = int(input())
C = list(map(int,input().split()))
C.sort()
score = 1
for i in range(n):
score *= C[i]-i
score %= (7+10**9)
print(score)
解説もそれっぽい。
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