Another Algorithm Job-Interview

Question

So here is the question:

Suppose you have 100 thousand integers which ranges from 1 to 1 million. Please sort out the integers. The time complexity should

Answer 1

Sounds like a straightforward counting sort.

1. Reserve memory for an array a of size 1 million
2. Initialize all array values to 0
3. Loop through the integers. For each integer i increment a[i] by one.
4. Output sorted sequence by walking through the array and printing each number i for a[i] times.

Space is constant. Runtime is O(n).