ABC159 D - Banned K

提出

code: python

n = int(input())

a = list(map(int, input().split()))

n_count = 0 * (n+1)

for i in a:

n_counti += 1

ans = 0

for i in n_count:

ans += i * (i - 1) // 2

for i in a:

print(ans - ((n_counti * (n_counti - 1) // 2) - (((n_counti - 1) * (n_counti - 2) // 2))))