Medium Accuracy: 36.35%
Submissions: 7775 Points: 4
Given an array A[] with N elements , you need to find the sum all sub arrays of array A. Since the sum could be very large print the sum modulo (109+7).
Example 1:
Input:
N = 3
A[] = {1, 2, 3}
Output: 20
Explanation:
All subarrays are [1], [2], [3],
[1,2], [2,3], [1,2,3].
Thus total sum is 20.
Example 2:
Input:
N = 2
A[] = {1, 3}
Output: 8
Your Task:
You don't need to read input or print anything. Your task is to complete the function subarraySum() which takes the array A[] and its size Nas inputs and returns the sum.
Expected Time Complexity: O(N) Expected Auxiliary Space: O(1)
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Avoid using static/global variables in coding problems as your code is tested
against multiple test cases and these tend to retain their previous values.
Passing the Sample/Custom Test cases in coding problems does not guarantee the
correctness of code. On submission, your code is tested against multiple test cases
consisting of all possible corner cases and stress constraints.
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