mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-01 03:53:33 +00:00
b5f743cdc3
We now build a separate APE binary for each test so they can run in parallel. We've got 148 tests running fast and stable so far.
95 lines
2.6 KiB
Python
95 lines
2.6 KiB
Python
"""Bisection algorithms."""
|
|
|
|
def insort_right(a, x, lo=0, hi=None):
|
|
"""Insert item x in list a, and keep it sorted assuming a is sorted.
|
|
|
|
If x is already in a, insert it to the right of the rightmost x.
|
|
|
|
Optional args lo (default 0) and hi (default len(a)) bound the
|
|
slice of a to be searched.
|
|
"""
|
|
|
|
if lo < 0:
|
|
raise ValueError('lo must be non-negative')
|
|
if hi is None:
|
|
hi = len(a)
|
|
while lo < hi:
|
|
mid = (lo+hi)//2
|
|
if x < a[mid]: hi = mid
|
|
else: lo = mid+1
|
|
a.insert(lo, x)
|
|
|
|
insort = insort_right # backward compatibility
|
|
|
|
def bisect_right(a, x, lo=0, hi=None):
|
|
"""Return the index where to insert item x in list a, assuming a is sorted.
|
|
|
|
The return value i is such that all e in a[:i] have e <= x, and all e in
|
|
a[i:] have e > x. So if x already appears in the list, a.insert(x) will
|
|
insert just after the rightmost x already there.
|
|
|
|
Optional args lo (default 0) and hi (default len(a)) bound the
|
|
slice of a to be searched.
|
|
"""
|
|
|
|
if lo < 0:
|
|
raise ValueError('lo must be non-negative')
|
|
if hi is None:
|
|
hi = len(a)
|
|
while lo < hi:
|
|
mid = (lo+hi)//2
|
|
if x < a[mid]: hi = mid
|
|
else: lo = mid+1
|
|
return lo
|
|
|
|
bisect = bisect_right # backward compatibility
|
|
|
|
def insort_left(a, x, lo=0, hi=None):
|
|
"""Insert item x in list a, and keep it sorted assuming a is sorted.
|
|
|
|
If x is already in a, insert it to the left of the leftmost x.
|
|
|
|
Optional args lo (default 0) and hi (default len(a)) bound the
|
|
slice of a to be searched.
|
|
"""
|
|
|
|
if lo < 0:
|
|
raise ValueError('lo must be non-negative')
|
|
if hi is None:
|
|
hi = len(a)
|
|
while lo < hi:
|
|
mid = (lo+hi)//2
|
|
if a[mid] < x: lo = mid+1
|
|
else: hi = mid
|
|
a.insert(lo, x)
|
|
|
|
|
|
def bisect_left(a, x, lo=0, hi=None):
|
|
"""Return the index where to insert item x in list a, assuming a is sorted.
|
|
|
|
The return value i is such that all e in a[:i] have e < x, and all e in
|
|
a[i:] have e >= x. So if x already appears in the list, a.insert(x) will
|
|
insert just before the leftmost x already there.
|
|
|
|
Optional args lo (default 0) and hi (default len(a)) bound the
|
|
slice of a to be searched.
|
|
"""
|
|
|
|
if lo < 0:
|
|
raise ValueError('lo must be non-negative')
|
|
if hi is None:
|
|
hi = len(a)
|
|
while lo < hi:
|
|
mid = (lo+hi)//2
|
|
if a[mid] < x: lo = mid+1
|
|
else: hi = mid
|
|
return lo
|
|
|
|
# Overwrite above definitions with a fast C implementation
|
|
try:
|
|
from _bisect import *
|
|
except ImportError:
|
|
pass
|
|
|
|
if __name__ == 'PYOBJ.COM':
|
|
import _bisect
|