Submission #8,401

2024-01-15 15:37:01

cpp17

Accepted 50/50

9ms

4220 KiB

#include <iostream>
using namespace std;
using unlong = unsigned long long;

int main() {
	std::ios::sync_with_stdio(false);
	std::cin.tie(0);
	unlong n, k; cin >> n >> k;
	int in = 0;
	int res = 0;
	for (int i = 0; i < n; i++)
	{
		cin >> in;
		if (in == 1)
			res++;
	}

	unlong sum = 0;
	for (int i = k; i <= res; i++) {
		sum += res - i + 1;
	}

	cout << sum;
	return 0;
}

	Sum	Test	Verdict		Time	Memory
base	50/50
		1	Accepted	0/0	3ms	1896 KiB
		2	Accepted	0/0	3ms	2360 KiB
		3	Accepted	0/0	9ms	2440 KiB
		4	Accepted	2/2	3ms	2652 KiB
		5	Accepted	2/2	3ms	2852 KiB
		6	Accepted	2/2	3ms	2876 KiB
		7	Accepted	3/3	3ms	3108 KiB
		8	Accepted	3/3	3ms	3440 KiB
		9	Accepted	3/3	3ms	3424 KiB
		10	Accepted	2/2	3ms	3512 KiB
		11	Accepted	3/3	3ms	3732 KiB
		12	Accepted	2/2	3ms	3816 KiB
		13	Accepted	3/3	3ms	3812 KiB
		14	Accepted	2/2	8ms	3816 KiB
		15	Accepted	2/2	8ms	3944 KiB
		16	Accepted	3/3	9ms	4028 KiB
		17	Accepted	3/3	9ms	4124 KiB
		18	Accepted	3/3	9ms	4088 KiB
		19	Accepted	3/3	8ms	4092 KiB
		20	Accepted	3/3	9ms	4188 KiB
		21	Accepted	3/3	9ms	4096 KiB
		22	Accepted	3/3	8ms	4220 KiB