91
Example: Subset Sum
(cont)
Cost analysis:
C
i
= #calls to
subsetsum2()
for array of length i
for worst case,
C
1
= 2
C
n
= 2 + 2·C
n-1
⇒ C
n
≅ 2
n
Thus,
subsetsum2
also is O(2
n
)
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