Submission #20,729

20729

2026-01-08 18:16:09

cpp17

Accepted 50/50

18ms

508 KiB

#include <iostream>
#include <vector>

using namespace std;


int main()
{
	int n;
	long long k;
	long long count = 0;
	cin >> n >> k;
	for (int i = 0; i < n; i++)
	{
		int x;
		cin >> x;
		if (x == 1)
		{
			count++;
		}
	}
	long long ans = 0;
	if (count - k + 1 >= 0)
	{
		ans = (count - k + 1) * (count - k + 2) / 2;
	}
	 

	cout << ans;
}

	Sum	Test	Verdict		Time	Memory
base	50/50
		1	Accepted	0/0	1ms	316 KiB
		2	Accepted	0/0	1ms	316 KiB
		3	Accepted	0/0	17ms	316 KiB
		4	Accepted	2/2	1ms	316 KiB
		5	Accepted	2/2	1ms	352 KiB
		6	Accepted	2/2	1ms	316 KiB
		7	Accepted	3/3	1ms	316 KiB
		8	Accepted	3/3	1ms	316 KiB
		9	Accepted	3/3	1ms	500 KiB
		10	Accepted	2/2	1ms	316 KiB
		11	Accepted	3/3	1ms	316 KiB
		12	Accepted	2/2	1ms	316 KiB
		13	Accepted	3/3	1ms	316 KiB
		14	Accepted	2/2	17ms	316 KiB
		15	Accepted	2/2	17ms	508 KiB
		16	Accepted	3/3	17ms	396 KiB
		17	Accepted	3/3	17ms	396 KiB
		18	Accepted	3/3	18ms	500 KiB
		19	Accepted	3/3	18ms	396 KiB
		20	Accepted	3/3	17ms	404 KiB
		21	Accepted	3/3	17ms	316 KiB
		22	Accepted	3/3	17ms	316 KiB