https://pintia.cn/problem-sets/994805342720868352/problems/994805381845336064
Given a sequence of positive integers and another positive integer p. The sequence is said to be a perfect sequence if M≤m×p where M and m are the maximum and minimum numbers in the sequence, respectively.
Now given a sequence and a parameter p, you are supposed to find from the sequence as many numbers as possible to form a perfect subsequence.
Each input file contains one test case. For each case, the first line contains two positive integers N and p, where N (≤10?5??) is the number of integers in the sequence, and p (≤10?9??) is the parameter. In the second line there are N positive integers, each is no greater than 10?9??.
For each test case, print in one line the maximum number of integers that can be chosen to form a perfect subsequence.
10 8
2 3 20 4 5 1 6 7 8 9
8
代码：
#include <bits/stdc++.h>
using namespace std;
const int maxn = 1e5 + 10;
long long a[maxn];
int main() {
int N, p, temp = 1;
scanf("%d%d", &N, &p);
for(int i = 1; i <= N; i ++)
scanf("%lld", &a[i]);
sort(a + 1, a + 1 + N);
for(int i = 1; i <= N; i ++) {
for(int j = temp + i; j <= N; j ++) {
if(a[j] <= a[i] * p)
temp = j - i + 1;
else break;
}
}
printf("%d\n", temp);
return 0;
}
暴力 离考试越来越近 心慌慌
FH
原文：https://www.cnblogs.com/zlrrrr/p/10364351.html