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Grokking the Coding Interview Patterns in C++

Find Pivot Index

Explore how to locate the pivot index in an integer array where the sum of elements on the left equals the sum on the right. Learn to track sums effectively to solve this problem confidently. This lesson helps develop a structured approach to frequency and sum analysis used in coding interviews.

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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 ...