Submission #797692

#	Time	Username	Problem	Language	Result	Execution time	Memory
797692		jackliy369	A Huge Tower (CEOI10_tower)	Cpython 3	0 / 100	284 ms	73392 KiB

tower

from cmath import sqrt
from math import floor


N, D = map(int, input().split())
blocks = sorted(list(map(int, input().split())))

def binary_search(l, r, size, list):
    ans = r + 1
    while r >= l:
        # m = (l + r) // 2
        m = l + floor(sqrt(r - l))
        if size <= list[m] + D:
            r = m - 1
            ans = m
        else:
            l = m + 1
    return ans

ans = 1
tower = [blocks[0]]
index = 0
for i in range(1, N):
    possibilities = 1
    index = binary_search(index, len(tower) - 1, blocks[i], tower)
    possibilities += len(tower) - index
    ans *= possibilities
    tower.append(blocks[i])

print(ans % 1000000009)

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