Given a sorted descending list of numbers, find the sum of all negative numbers.



In [1]:

    
# Input
lst = [7,5,4,4,3,1,-2,-3,-5,-7]



In [2]:

    
# Method 1 - Using a for loop
total = 0
for i in reversed(lst):
    if i > 0:
        break
    total += i
    
print(total)

-17



In [3]:

    
# Method 2 - Using a while loop
total1 = 0
j = 1
while True:
    total1 += lst[-j]
    j += 1
    if lst[-j] > 0:
        break
        
print(total1)

-17