Find Pivot Index- Leetcode 724 | Find the middle index in array- Leetcode 1991 | #9 | Entri Elevate

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Find Pivot Index - Leetcode 724 | Find the middle index in array - Leetcode 1991 | #9 | Entri Elevate

For the Leetcode problem #724 "Find Pivot Index", the task is to find the index in an array where the sum of the numbers to the left of the index is equal to the sum of the numbers to the right of the index. In other words, we need to find a pivot index that splits the array into two parts with equal sum.

In the solution video, we can start by calculating the total sum of the array, and then iterate through the array to find the pivot index. We keep track of the left sum and right sum as we iterate, and we check if the left sum and right sum are equal at each index. If we find a pivot index, we return it. Otherwise, we return -1 to indicate that no pivot index exists.

For the Leetcode problem #1991 "Find the Middle Index in Array", the task is to find the index in an array where the sum of the numbers to the left of the index is equal to the sum of the numbers to the right of the index, but the pivot index should not include the middle element. In other words, we need to find a pivot index that splits the array into two parts with equal sum, but the pivot index should not include the middle element.

In the solution video, we can start by calculating the total sum of the array, and then iterate through the array to find the pivot index. We keep track of the left sum and right sum as we iterate, and we check if the left sum and right sum are equal at each index, except for the middle index. If we find a pivot index, we return it. Otherwise, we return -1 to indicate that no pivot index exists.

00:00 - Intro of the Video
00:15 - Leetcode Problem Find Pivot Index
02:02 - Leetcode solution Find Pivot Index
06:02 - End of the video
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