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.
Input Specification:
Each input file contains one test case. For each case, the first line contains two positive integers N and p, where N (≤105) is the number of integers in the sequence, and p (≤109) is the parameter. In the second line there are N positive integers, each is no greater than 109.
Output Specification:
For each test case, print in one line the maximum number of integers that can be chosen to form a perfect subsequence.
Sample Input:
10 8
2 3 20 4 5 1 6 7 8 9
Sample Output:
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 ", temp); return 0; }
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