Data Interview Qs - Subarrays having a sum of p

Suppose you have an unsorted array of integers. Can you find the number of subarrays that have a sum exactly to the given number p?

    
Input: 
    
array = [10, 2, -2, -20, 10]
    
k = -10
    
Output : 3
    
#The following subarrays [10, 2, -2, -20], [2, -2, -20, 10], [-20, 10] have a sum exactly equal to -10
    
                
    
Input: 
    
array = [9, 4, 20, 3, 10, 5]
    
k = 33
    
Output : 2
    
#The following subarrays [9, 4, 20], [20, 3, 10] have a sum exactly equal to 33