codeforces 274A k-Multiple Free Set

1361 단어
A k-multiple free set is a set of integers where there is no pair of integers where one is equal to another integer multiplied by k. That is, there are no two integers x and y (x < y) from the set, such that y = x·k.
You're given a set of n distinct positive integers. Your task is to find the size of it's largest k-multiple free subset.
Input
The first line of the input contains two integers n and k (1 ≤ n ≤ 105, 1 ≤ k ≤ 109). The next line contains a list of n distinct positive integers a1, a2, ..., an (1 ≤ ai ≤ 109).
All the numbers in the lines are separated by single spaces.
Output
On the only line of the output print the size of the largest k-multiple free subset of {a1, a2, ..., an}.
Sample test(s)
input
6 2
2 3 6 5 4 10

output
3

Note
In the sample input one of the possible maximum 2-multiple free subsets is {4, 5, 6}.
n, k. 및 a를 입력하여 a에서 가장 긴 연속 비k배 서열의 길이를 구하십시오
시간 초과 문제에 주의해야 한다
# coding=utf-8
n, k = list(map(int, input().split(' ')))
a = list(map(int, input().split(' ')))
a.sort()
s = []
d = {}
m = 0
for i in a:
    if i % k != 0:
        s.append(i)
        d[i] = 1
        m += 1
    elif (i // k) not in d:
        s.append(i)
        d[i] = 1
        m += 1
print(m)

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