Lookup Solution - Intro to Computer ScienceYouTube↗  IA↗(long shot)
Education  1.4K views 11 likes 0 dislikes   29 May 2012
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so here's the way we could define the
Ecco un modo nel quale potremmo definire la procedura "lookup"
lookup procedure it takes two inputs the
Riceve due parametri, l'indice ed una parola chiave
index and a keyword and as a reminder I've drawn the structure of the index
Come promemoria, ho disegnato la struttura dell'indice qui
here it's a list each element in the
E' una lista, ciascun elemento della quale è una voce
list is an entry each entry is a list
Ogni voce è essa stessa una lista
itself where the first part of the list
Dove la prima parte della lista è una parola chiave
is the keyword and the second part is a list of URLs so what we want to do to
La seconda parte è una lista di URL
define lookup is very similar to what we
Quindi quello che vogliamo fare per definire "lookup" è molto simile a
did for head to index we want to go
quello che abbiamo fatto per "addtoindex"
through the entries in the next to try
Vogliamo iterare attraverso le voci nell'indice
to find one that matches the keyword so
e provare a trovarne una che corrisponde alla parola chiave
let's write that again that's going to
Quindi riscriviamolo
be a for loop and it's going to be
Ci sarà un ciclo "for", e sarà
exactly the same code as we had before
esattamente lo stesso codice che avevamo prima
so we're going to loop through the
Poi cercheremo attraverso gli elementi dell'indice ogni volta
elements in the index each time we go through the loop the variable entry will
passiamo attraverso il ciclo.
refer to one of those elements we're
La variabile "entry" farà riferimento ad uno di quegli elementi
going to check if the value in position
Verificheremo se il valore a posizione zero
0 which is the keyword of that entry
che è la parola chiave per quella voce
matches the keyword we're looking for
corrisponde alla parola chiave che stiamo cercando
when we were defining add to index what
Quando stavamo definendo "addtoindex",
we did when we found a match was the pen
quello che facevamo quando si trovava una corrispondenza era
the URL to the list of URLs associated
attaccare l'URL alla lista di URL associati a quella parola chiave
with that keyword what we want to do for
Quello che vogliamo fare per "lookup" è diverso
lookup is different all we need to do for lookup now is return the list of URLs and we can find that by looking in
Tutto quello che occorre fare per "lookup" è ritornare la lista di URL
position 1 of entry if we get to the end
E possiamo trovarli cercando in posizione 1 di "entry"
of the list without finding that keyword
Se arriviamo alla fine della lista senza trovare la parola chiave
well then we still need to return
Allora dovremo comunque ritornare qualche cosa
something and the way we describe lookup what it should return is the empty list
e, da come abbiamo descritto "lookup", quello che dovremmo ritornare è una lista vuota
that means there are no URLs that we
Vale a dire che non ci sono URL che fino ad ora sono stati trovati
found so far they contain that keyword
che contengano quella parola chiave
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