Submission #797715

#	Time	Username	Problem	Language	Result	Execution time	Memory
797715		jackliy369	A Huge Tower (CEOI10_tower)	Cpython 3	90 / 100	1089 ms	72980 KiB

tower

from math import floor, log2, sqrt


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 + 1))
        m = l + (r - l) // 1000000
        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)

• Subtask 1: 5 / 5
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• Subtask 20: 0 / 5