724. Find Pivot Index

https://leetcode.com/problems/find-pivot-index/

Python

class Solution:
    def pivotIndex(self, nums: List[int]) -> int:
        total = sum(nums)
        lsum = 0

        for i, num in enumerate(nums):
            if lsum == (total - lsum - num):
                return i
            lsum += num
        return -1