Submission #8,297

2024-01-14 11:54:40

cpp17

Accepted 50/50

9ms

3428 KiB

#include <bits/stdc++.h>

using namespace std;
using ull = unsigned long long;

int main()
{
    ios::sync_with_stdio(false); cin.tie(0);
    ull n, k; cin >> n >> k;

    ull r = 0;
    for (int i = 0; i < n; i++) {
        int a; cin >> a;
        if (a == 1) r++;
    }

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

    cout << sum;
}

	Sum	Test	Verdict		Time	Memory
base	50/50
		1	Accepted	0/0	3ms	1892 KiB
		2	Accepted	0/0	3ms	2084 KiB
		3	Accepted	0/0	9ms	2304 KiB
		4	Accepted	2/2	3ms	2508 KiB
		5	Accepted	2/2	3ms	2716 KiB
		6	Accepted	2/2	3ms	2804 KiB
		7	Accepted	3/3	2ms	2804 KiB
		8	Accepted	3/3	3ms	2960 KiB
		9	Accepted	3/3	3ms	3072 KiB
		10	Accepted	2/2	3ms	2820 KiB
		11	Accepted	3/3	3ms	2820 KiB
		12	Accepted	2/2	3ms	2820 KiB
		13	Accepted	3/3	3ms	2948 KiB
		14	Accepted	2/2	8ms	3048 KiB
		15	Accepted	2/2	8ms	3164 KiB
		16	Accepted	3/3	9ms	3416 KiB
		17	Accepted	3/3	9ms	3264 KiB
		18	Accepted	3/3	9ms	3420 KiB
		19	Accepted	3/3	9ms	3428 KiB
		20	Accepted	3/3	9ms	3280 KiB
		21	Accepted	3/3	9ms	3284 KiB
		22	Accepted	3/3	8ms	3428 KiB