Balanced sum X45803
Design the function @suma_equilibrada(f)@ that, given a list of integers , returns the smallest index such that the sum of the elements of from the first position until the position is equal to the sum of the subsequent elements. Note that has to be a valid position in the list. If this position does not exist, the function will return -1.
Sample session
Sample session
>>> suma_equilibrada([1, 1, 1, 1]) 1 >>> suma_equilibrada([10, 10, 7, 3, 30]) 3 >>> suma_equilibrada([10, 20]) -1 >>> suma_equilibrada([-3, 5, -2]) 2 >>> suma_equilibrada([0]) 0 >>> suma_equilibrada([]) -1