For later

 1. O(1)        Constant
 2. O(N)        Linear
 3. O(log₂ N)   Logarithmic
 4. O(1)        Constant
 5. O(N)        Linear
 6. O(log₂ N)   Logarithmic
 7. O(N²)       Quadratic
 8. O(N log₂ N) Log-Linear
 9. O(N³)       Cubic
10. O(2ᴺ)       Exponential
11. O(N²)       Quadratic
12. O(log₂ N)   Logarithmic