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- class Solution:
- def pivotIndex(self, nums: List[int]) -> int:
- totalSum = sum(nums)
- runningSum = 0
- for i in range(len(nums)):
- leftSum = runningSum
- rightSum = totalSum - runningSum - nums[i]
- if leftSum == rightSum:
- return i
- runningSum += nums[i]
- return -1
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