mirror of
https://github.com/python/cpython.git
synced 2024-11-26 19:34:19 +08:00
24 lines
458 B
Python
24 lines
458 B
Python
|
# Bisection algorithms
|
||
|
|
|
||
|
|
|
||
|
|
# Insert item x in list a, and keep it sorted assuming a is sorted
|
||
|
|
|
||
|
|
def insort(a, x):
|
||
|
|
lo, hi = 0, len(a)
|
||
|
|
while lo < hi:
|
||
|
|
mid = (lo+hi)/2
|
||
|
|
if x < a[mid]: hi = mid
|
||
|
|
else: lo = mid+1
|
||
|
|
a.insert(lo, x)
|
||
|
|
|
||
|
|
|
||
|
|
# Find the index where to insert item x in list a, assuming a is sorted
|
||
|
|
|
||
|
|
def bisect(a, x):
|
||
|
|
lo, hi = 0, len(a)
|
||
|
|
while lo < hi:
|
||
|
|
mid = (lo+hi)/2
|
||
|
|
if x < a[mid]: hi = mid
|
||
|
|
else: lo = mid+1
|
||
|
|
return lo
|