mirror of
https://github.com/TheAlgorithms/Python.git
synced 2024-12-24 12:10:16 +00:00
7592cba417
* added sol3.py for problem_20 * added sol4.py for problem_06 * ran `black .` on `\Python`
55 lines
1.2 KiB
Python
55 lines
1.2 KiB
Python
# run using python fibonacci_search.py -v
|
|
|
|
"""
|
|
@params
|
|
arr: input array
|
|
val: the value to be searched
|
|
output: the index of element in the array or -1 if not found
|
|
return 0 if input array is empty
|
|
"""
|
|
|
|
|
|
def fibonacci_search(arr, val):
|
|
|
|
"""
|
|
>>> fibonacci_search([1,6,7,0,0,0], 6)
|
|
1
|
|
>>> fibonacci_search([1,-1, 5, 2, 9], 10)
|
|
-1
|
|
>>> fibonacci_search([], 9)
|
|
0
|
|
"""
|
|
fib_N_2 = 0
|
|
fib_N_1 = 1
|
|
fibNext = fib_N_1 + fib_N_2
|
|
length = len(arr)
|
|
if length == 0:
|
|
return 0
|
|
while fibNext < len(arr):
|
|
fib_N_2 = fib_N_1
|
|
fib_N_1 = fibNext
|
|
fibNext = fib_N_1 + fib_N_2
|
|
index = -1
|
|
while fibNext > 1:
|
|
i = min(index + fib_N_2, (length - 1))
|
|
if arr[i] < val:
|
|
fibNext = fib_N_1
|
|
fib_N_1 = fib_N_2
|
|
fib_N_2 = fibNext - fib_N_1
|
|
index = i
|
|
elif arr[i] > val:
|
|
fibNext = fib_N_2
|
|
fib_N_1 = fib_N_1 - fib_N_2
|
|
fib_N_2 = fibNext - fib_N_1
|
|
else:
|
|
return i
|
|
if (fib_N_1 and index < length - 1) and (arr[index + 1] == val):
|
|
return index + 1
|
|
return -1
|
|
|
|
|
|
if __name__ == "__main__":
|
|
import doctest
|
|
|
|
doctest.testmod()
|