i wantI want here code for this question in cpp

Given an array containing $N$ integers and an integer $K.,$ Your task is to find the length of the longes Sub$-$Array with the sum of the elements equal to the given value $K.$

Example $1$:

Input :

$AD=\{10,5,2,7,1,9\}$

$K=15$

Input :

Output : $4$

Explanation: $$

The sub$-$array is $\{5,2,7,1\}.$

Example $2$