What is the time complexity of the recurrence T(n)=2T(n/2)+O(n)T(n) = 2T(n/2) + O(n)T(n)=2T(n/2)+O(n)?
O(logn)O(\\log n)O(logn)
O(n2)O(n^2)O(n2)
O(nlogn)O(n \\log n)O(nlogn)
O(n)O(n)O(n)