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from bisect import *
def find_le(a, x):
"""Find rightmost value less than or equal to x"""
return bisect_right(a, x)-1
def find_ge(a, x):
"""Find leftmost value greater than x"""
return bisect_left(a, x)
def parental_tree_search(root, childrenstr, conditionstr):
"""Returns parents of nodes that meed a given condition"""
ret = []
queue = [root]
while queue:
current = queue.pop()
children = eval('current'+childrenstr)
for child in children:
if eval('child'+conditionstr):
ret.append(current)
#we know have a tree, so there are no back-edges etc, so no checking of that kind is
#necessary
queue += children
return ret
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