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Midterm cheat sheet CS381

Midterm cheat sheet CS381

作者: 成江 | 来源:发表于2018-02-05 01:32 被阅读18次

For every b > 1 and every x > 0, we have logb n = O(nx).
For every r > 1 and every d > 0, we have nd = O(rn).

2log3n = nlog23

T(n) = T(n/3) + T(2n/3) + cn, T(n) is O(nlgn).

Proof of T(n) is Ω(nlgn):

     T(n) ≥ (work done by leftmost leaves) + (cn⋅hleft)
             ≥T1⋅2log3(n)+cn⋅log3(n)
             =T1⋅nlog3(2)+cn⋅log3(n)
             ≈T1⋅n0.63+cn⋅log3(n)
             =Ω(nlgn)

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