i have column a have positive and negative numbers i want to add sum in column b at each sequence of positive and negative number for example first positive sequence start from 1 to 2 so sum equal 3 second negative number start at 3- to -5 so results equal -11

i want formula to add in column b to solve this problem

1

2 Result 3

-3

-3

-5 Result -11

6

2

4

4 Result 16

-1

-5

-6 Result -12