TCS Codings – 2

def find_equilibrium_index(arr):

    total_sum = sum(arr)

    left_sum = 0

    for i in range(len(arr)):

        # right_sum = total_sum – left_sum – arr[i]

        if left_sum == (total_sum – left_sum – arr[i]):

            return i + 1 # returning 1-based index

        left_sum += arr[i]

    return -1 # if no equilibrium index found

# ———– Test Case 1 ————-

arr1 = [7, -7, 1, 5, 2, -4, 3, 0] # Custom test to visualize

# ———– Test Case 2 ————-

input1 = “-7152-430”

arr2 = [int(ch) for ch in input1]

print(“Output:”, find_equilibrium_index(arr2)) # Output: 4

# ———– Test Case 3 ————-

input2 = “1111322”

arr3 = [int(ch) for ch in input2]

• print(“Output:”, find_equilibrium_index(arr3)) # Output: 5