Problem Statement
Find sum of all elements in array.
Approach
sum(arr, n) = arr[n-1] + sum(arr, n-1).
Time & Space Complexity
Time O(n), Space O(n).

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Simple recursion for array sum.
Find sum of all elements in array.
sum(arr, n) = arr[n-1] + sum(arr, n-1).
Time O(n), Space O(n).
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