Find The Missing Number
You are given a list/array of \(n-1\) unsorted positive integers which you know to be the first \(n\) whole numbers with one of them missing.
About how many operations are needed (as a minimum) to determine which number is missing?
Note: For the purposes of this problem, one operation is defined as an addition, subtraction, multiplication, division, or element comparison.
Just for fun: Can you use your algorithm to find the missing number in this list of 9999 of the first 10,000 whole numbers?