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水题:Counting Kangaroos is Fun

时间:2015-04-27 14:47:15      阅读:128      评论:0      收藏:0      [点我收藏+]

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Description

There are n kangaroos with pockets. Each kangaroo has a size (integer number). A kangaroo can go into another kangaroo‘s pocket if and only if the size of kangaroo who hold the kangaroo is at least twice as large as the size of kangaroo who is held.

Each kangaroo can hold at most one kangaroo, and the kangaroo who is held by another kangaroo cannot hold any kangaroos.

The kangaroo who is held by another kangaroo cannot be visible from outside. Please, find a plan of holding kangaroos with the minimal number of kangaroos who is visible.

Input

The first line contains a single integer — n(1 ≤ n ≤ 5·105). Each of the next n lines contains an integer si — the size of the i-th kangaroo (1 ≤ si ≤ 105).

Output

Output a single integer — the optimal number of visible kangaroos.

Sample Input

Input
8
2
5
7
6
9
8
4
2
Output
5
Input
8
9
1
6
2
6
5
8
3
Output
5

 

技术分享
 1 #include <cstdio>
 2 #include <iostream>
 3 #include <cstring>
 4 #include <string>
 5 #include <algorithm>
 6 
 7 using namespace std;
 8 
 9 const int MAX = 5e5 + 10;
10 
11 int arr[MAX];
12 
13 int main()
14 {
15 #ifdef OFFLINE
16     freopen("in.txt", "r", stdin);
17     freopen("out.txt", "w", stdout);
18 #endif
19 
20     int n;
21     while (~scanf("%d", &n))
22     {
23         memset(arr, 0, sizeof(arr));
24 
25         for (int i = 0; i < n; i++)
26             scanf("%d", &arr[i]);
27 
28         sort(arr, arr + n);
29         reverse(arr, arr + n);
30 
31         int crt = 0, ans = (n + 1) / 2;
32         for (int i = (n + 1) / 2; i < n; i++)
33             if (arr[i] * 2 <= arr[crt])
34                 crt++;
35             else
36                 ans++;
37 
38         printf("%d\n", ans);
39     }
40 
41     return 0;
42 }
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水题:Counting Kangaroos is Fun

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原文地址:http://www.cnblogs.com/gwsbhqt/p/4459981.html

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