Submission #21,458

2026-01-13 09:23:11

cpp17

Accepted 50/50

18ms

1172 KiB

#include <iostream>
using namespace std;

int main()
{
    long long n, k, p=0;
    cin >> n >> k;
    long long t[n];
    for(int i=0; i<n; i++)
    {
        cin >> t[i];
        if(t[i]==1)
        {
            p++;
        }

    }
    if(k>p)
    {
        cout << 0;
        return 0;
    }
    cout << (p+1-k)*(p+2-k)/2;



    return 0;
}

	Sum	Test	Verdict		Time	Memory
base	50/50
		1	Accepted	0/0	2ms	316 KiB
		2	Accepted	0/0	2ms	316 KiB
		3	Accepted	0/0	18ms	1076 KiB
		4	Accepted	2/2	1ms	316 KiB
		5	Accepted	2/2	1ms	316 KiB
		6	Accepted	2/2	1ms	316 KiB
		7	Accepted	3/3	1ms	316 KiB
		8	Accepted	3/3	1ms	384 KiB
		9	Accepted	3/3	1ms	316 KiB
		10	Accepted	2/2	1ms	316 KiB
		11	Accepted	3/3	1ms	332 KiB
		12	Accepted	2/2	1ms	316 KiB
		13	Accepted	3/3	1ms	368 KiB
		14	Accepted	2/2	17ms	936 KiB
		15	Accepted	2/2	17ms	988 KiB
		16	Accepted	3/3	17ms	1048 KiB
		17	Accepted	3/3	17ms	940 KiB
		18	Accepted	3/3	18ms	1056 KiB
		19	Accepted	3/3	17ms	944 KiB
		20	Accepted	3/3	17ms	1020 KiB
		21	Accepted	3/3	18ms	1044 KiB
		22	Accepted	3/3	18ms	1172 KiB