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Editorial Team
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Asked: 2026-05-17T20:32:45+00:00

So here is the question: Suppose you have 100 thousand integers which ranges from

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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 be O(n).

Anybody who shares his or her ideas is well appreciated.

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1 Answer

  1. Editorial Team

    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).

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