Submission #852812

#	Time	Username	Problem	Language	Result	Execution time	Memory
852812		iamjiamingliu	A Huge Tower (CEOI10_tower)	Cpython 3	0 / 100	1053 ms	262148 KiB

tower

import sys

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

dp = [[0] * len(nums) for _ in range(1 << len(nums))]
for i in range(len(nums)):
    dp[1 << i][i] = 1

for subset in range(1 << len(nums)):
    if subset.bit_count() == 1: continue
    for last in range(len(nums)):
        if (1 << last) & subset:
            for prev_last in range(len(nums)):
                if (1 << prev_last) & subset and nums[last] <= nums[prev_last] + diff:
                    dp[subset][last] += dp[subset ^ (1 << last)][prev_last]

print(sum(dp[-1]))

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