Submission #852898

#	Time	Username	Problem	Language	Result	Execution time	Memory
852898		iamjiamingliu	A Huge Tower (CEOI10_tower)	Cpython 3	100 / 100	785 ms	75856 KiB

tower

import sys

MOD = 10 ** 9 + 9

_, diff = map(int, input().split())
nums = list(map(int, sys.stdin.readline().strip().split()))
nums.sort()

ways = 1
left_i = 0
for i, n in enumerate(nums):
    while n > nums[left_i] + diff:
        left_i += 1
    ways = (ways * (i - left_i + 1)) % MOD

print(ways)

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
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• Subtask 5: 5 / 5
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• Subtask 20: 5 / 5