이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
N, D = map(int, input().split())
blocks = sorted(list(map(int, input().split())))
ans = 1
tower = [blocks[0]]
for i in range(1, N):
possibilities = 1
index = 0
first_possible = 0
for block in tower[index:]:
if blocks[i] <= block + D:
possibilities += 1
if first_possible == 0:
index = i
first_possible = 1
ans *= possibilities
tower.append(blocks[i])
print(ans % 1000000009)
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