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: 1..10
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A. " #
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& « » % :
• : ' # PIN x
• #$ : ( )/*+) x
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A. " #
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$
$ !, ,
. 01 % ! % .
found=0;
for (i=0; i<N; i++)
{
if (x==PIN[i])
{
found=1;
break;
}
}
% 1: « - » , ,
PIN=[6,4,2,7,3] , x=7.
% 2: 1 linear_search.c
# # x 1 0/1
.

. " #
3. ,
1. 0 /
%! "
& (Binary Search)
1 .
' 2 : * , - !
, x - -
:
x, % !
x /
x /
! 1 !, (o , # # int
pinakas[N] % start,finish, middle % ):
. " #
3. ,
1. 0 /
&! "
start=0;
finish=N-1;
found=FALSE;
while(start<=finish)
{
middle=(start+finish)/2;
if (x==pinakas[middle])
{
found=TRUE;
break;
}
else if (x<pinakas[middle])
finish=middle-1;
else // x>pinakas[middle]
start=middle+1;
}
. " #
3. ,
1. 0 /
'! "
0 / 11 :
1 / : start=0,finish=14: middle=(0+14) div 2=7. x<A[middle]
2 / : start=0,finish=6: middle=(0+6) div 2=3. x>A[middle]
3 / : start=4,finish=6: middle=(4+6) div 2=5. x<A[middle]
4 / : start=4,finish=4: middle=(4+6) div 2=5. x==A[middle]
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
2 3 5 7 11 13 17 21 23 27 31 33 37 41 43
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
2 3 5 7 11 13 17 21 23 27 31 33 37 41 43
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
2 3 5 7 11 13 17 21 23 27 31 33 37 41 43
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
2 3 5 7 11 13 17 21 23 27 31 33 37 41 43
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
2 3 5 7 11 13 17 21 23 27 31 33 37 41 43
start
start
start
start=finish
finish
finish
finish
. " #
3. ,
1. 0 /
(! "
% : 1 binary_search.c
# # x 1 0/1
.

& ( , , , ) ,
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! 1 !, (o , # # int
pinakas[N] % start,finish, middle % ):
. " #
3. ,
2. ,
*+! "
int binary_search_rec(int *pinakas, int start, int finish, int x)
{
int middle;
if (start>finish)
return FALSE;
else
{
middle=(start+finish)/2;
if (x==pinakas[middle])
return TRUE;
else if (x<pinakas[middle])
return binary_search_rec(pinakas,start,middle-1,x);
else
return binary_search_rec(pinakas,middle+1,finish,x);
}
}
4.
01 1: 0 1 LinearSearch
! "
**
5 / ! C # - :
1 0/1 , 1
-1 ,
,
5 / main , ( !
)
4.
01 2: 0 1 BinarySearch
! "
*
5 / ! C , , # - :
0 1 0/1
# 1 % 1 :
-1 ,
,
5 / main , ( !
% )

4.
01 3: , 6
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4.
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# / # , - (
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