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In Lecture 8, we are shown a hashing implementation (2nd one) which has trick for converting ch to ints. A loop (for c in str) has:
val = val + shift*ord(c)
shift +=1
I understand the ord() part, I'm just wondering why a multiplier (shift) is applied as well before adding to the val sum? Why not just use ord(c)?
 one year ago
 one year ago
In Lecture 8, we are shown a hashing implementation (2nd one) which has trick for converting ch to ints. A loop (for c in str) has: val = val + shift*ord(c) shift +=1 I understand the ord() part, I'm just wondering why a multiplier (shift) is applied as well before adding to the val sum? Why not just use ord(c)?
 one year ago
 one year ago

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AnteBest ResponseYou've already chosen the best response.0
I can only guess that the shift is there to ensure that converting different strings produces different values. (I assume we don't want to end up with fake positive results when searching for certain strings) But I don't know how exactly the shift is solving the problem and Guttag really did not elaborate on that...
 one year ago

Feet_WetBest ResponseYou've already chosen the best response.0
That was my guess, too, but I don't see a guarantee of uniqueness there.
 one year ago
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