Submission #21,461

2026-01-13 09:24:09

cpp17

Accepted 50/50

19ms

1156 KiB

#include <iostream>

using namespace std;

int main()
{
    long long n, k;
    cin>>n>>k;
    long long s=0;
    long long t[n];
    for (long long i=0; i<n; i++)
    {
        cin>>t[i];
        if(t[i]==1)
        {
            s++;
        }
    }
    if(s<k)
    {
        cout<<0;
        return 0;
    }
    cout<<(s-k+2)*(s-k+1)/2;
    return 0;
}

	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	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	316 KiB
		9	Accepted	3/3	1ms	316 KiB
		10	Accepted	2/2	1ms	392 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	936 KiB
		15	Accepted	2/2	17ms	1136 KiB
		16	Accepted	3/3	19ms	1096 KiB
		17	Accepted	3/3	17ms	992 KiB
		18	Accepted	3/3	19ms	932 KiB
		19	Accepted	3/3	17ms	960 KiB
		20	Accepted	3/3	18ms	1004 KiB
		21	Accepted	3/3	18ms	1028 KiB
		22	Accepted	3/3	18ms	1156 KiB