- Time limit: 1.00 s
- Memory limit: 512 MB
Input
The first input line has two integers $n$ and $k$.
The next line has $n$ integers $x_1,x_2,\dots,x_n$: the contents of the array.
Output
Print one integer: the number of subarrays.
Constraints
- $1 \le k \le n \le 2 \cdot 10^5$
- $1 \le x_i \le 10^9$
Input:
5 2
1 2 3 1 1
Output:
10