
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Transcribed Image Text:Assignment Content
Given an array of integers Arr, calculate the pivot
index of this array.
The pivot index is the index where the sum of all the
numbers strictly to the left of the index is equal to the
sum of all the numbers strictly to the index's right.
If the index is on the left edge of the array, then the
left sum is 0 because there are no elements to the left.
This also applies to the right edge of the array.
Return the leftmost pivot index. If no such index exists,
return -1.
![Example 1:
Input: Arr= [1,7,3,6,5,6]
Output: 3
Explanation:
The pivot index is 3.
Left sum = Arr [0] + Arr[1] + Arr [2] = 1
+ 7 + 3 = 11
Right sum= Arr [4] + Arr [5] = 5 + 6 =
11
Example 2:
Input: Arr [1,2,3]
Output: -1
Explanation:
There is no index that satisfies the
conditions in the problem statement.
Example 3:
Input: Arr [2,1,-1]
Output: 0
Explanation:
The pivot index is 0.
Left sum = 0 (no elements to the left
of index 0)
Right sum= Arr [1] + Arr [2] = 1 + 1 =
0
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Transcribed Image Text:Example 1:
Input: Arr= [1,7,3,6,5,6]
Output: 3
Explanation:
The pivot index is 3.
Left sum = Arr [0] + Arr[1] + Arr [2] = 1
+ 7 + 3 = 11
Right sum= Arr [4] + Arr [5] = 5 + 6 =
11
Example 2:
Input: Arr [1,2,3]
Output: -1
Explanation:
There is no index that satisfies the
conditions in the problem statement.
Example 3:
Input: Arr [2,1,-1]
Output: 0
Explanation:
The pivot index is 0.
Left sum = 0 (no elements to the left
of index 0)
Right sum= Arr [1] + Arr [2] = 1 + 1 =
0
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