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Given an array of N positive integers, find GCD of all the array elements.
Example 1:
Input: N = 3, arr[] = {2, 4, 6}
Output: 2
Explanation: GCD of 2,4,6 is 2.
Example 2:
Input: N = 1, arr[] = {1}
Output: 1
Explanation: Greatest common divisor of
all the numbers is 1.
Your Task:
You don't need to read input or print anything. Complete the function gcd()which takes N and array as input parameters and returns the gcd.
Expected Time Complexity: O(N logN)
Expected Auxiliary Space: O(1)
Constraints:
1 ≤ N, arr[i] ≤ 105
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