EQUILIBRIUM INDEX IN ARRAY in Python

 

The Equilibrium Index of an array is an index where the sum of the elements on the left side of the index is equal to the sum of the elements on the right side.

def find_equilibrium_index(arr):

    total_sum = sum(arr)

    left_sum = 0

    for i, num in enumerate(arr):

        total_sum -= num  

        

        if left_sum == total_sum:

            return i 

        

        left_sum += num  

    

    return -1  

# Example usage

arr = [1, 3, 5, 2, 2]

equilibrium_index = find_equilibrium_index(arr)

print(f"Equilibrium Index: {equilibrium_index}")

#source code --> clcoding.com

Equilibrium Index: 2