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Grokking the Coding Interview Patterns in Go

Solution: Find Pivot Index

Explore how to identify the pivot index in an array by tracking running sums. Understand how to optimize with a single pass using leftSum, rightSum, and totalSum to find the leftmost equilibrium point.

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Statement

Given an integer array nums, find the pivot index of the array.

The pivot index is defined as the index where the sum of all elements strictly to its left equals the sum of all elements strictly to its right. If the index lies on the left edge of the array, the left sum is considered 00 since no elements exist to its left. The same applies when the index lies on the right edge.

Return the leftmost pivot index. If no such index exists, return −1-1.

Constraints:

  • 1≤1 \leq ...