Examples of O-notation

• 42 = O(1)

• 3n + 42=O(n)

• 5n2 – 3n + 7 = O(n2)

• 12 + 22 + … + n2 = n3/3 + n2/2 + n/6

  • = O(n3)

• Loosely: Pick the fastest growing term and discard constant multiples

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