Next Round

最新推荐文章于 2022-06-06 13:30:27 发布

原创最新推荐文章于 2022-06-06 13:30:27 发布 · 1.6k 阅读

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本文介绍了ACM竞赛中晋级下一轮的标准，参赛者得分达到或超过第k名选手的分数即可晋级，前提是该分数为正数。文章通过示例说明了如何计算晋级人数，并提供了一段C++代码实现。

"Contestant who earns a score equal to or greater than the k-th place finisher's score will advance to the next round, as long as the contestant earns a positive score..." — an excerpt from contest rules.

A total of n participants took part in the contest (n ≥ k), and you already know their scores. Calculate how many participants will advance to the next round.

Input

The first line of the input contains two integers n and k (1 ≤ k ≤ n ≤ 50) separated by a single space.

The second line contains n space-separated integers a1, a2, ..., an (0 ≤ ai ≤ 100), where ai is the score earned by the participant who got the i-th place. The given sequence is non-increasing (that is, for all i from 1 to n - 1 the following condition is fulfilled: ai ≥ ai + 1).

Output

Output the number of participants who advance to the next round.

Examples

input
8 5
10 9 8 7 7 7 5 5

output
6

input
4 2
0 0 0 0

output
0

Note

In the first example the participant on the 5th place earned 7 points. As the participant on the 6th place also earned 7 points, there are 6 advancers.

In the second example nobody got a positive score.

ACM的一道水题，就是统计大于等于第k且不等于零的数的个数。

</pre><pre name="code" class="cpp">#include "stdio.h"
#define N 51
int main()
{
	int n,k,i,count=0;
	scanf ("%d%d",&n,&k);
	int a[N];
	for (i=0;i<n;i++) 
	scanf ("%d",&a[i]);
	for (i=0;i<n;i++)
	{
		if (a[i]&&a[i]>=a[k-1])
		count++;
	}
	printf ("%d\n",count);
}