Python Challenges: Find equilibrium index from a given array

Last update on December 21 2024 07:49:47 (UTC/GMT +8 hours)

Write a Python program to find equilibrium index from a given array. If there is no equilibrium index return 1.


Ref: https://rosettacode.org/wiki/Equilibrium_index

Sample Solution:

Python Code:

def equilibrium(a):
  """https://bit.ly/33Spl45"""

  if len(a) == 0:
    return -1

  left_sum = 0

  for i in range(len(a) - 1):

    right_sum = 0
    middle_point = i + 1
    left_sum += a[i]

    for j in range(middle_point + 1, len(a)):
      right_sum += a[j]

    if left_sum == right_sum:
      return middle_point
  
  return -1

print(equilibrium([1,4,2,0,3,8,-4])) 
print(equilibrium([]))

Sample Output:

3
-1

Flowchart:

Python Code Editor:

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