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D_delete.py
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D_delete.py
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from collections import defaultdict
class TrieNode:
def __init__(self):
self.children = defaultdict()
self.terminating = False
class Trie:
def __init__(self):
self.root = self.get_node()
def get_node(self):
return TrieNode()
def get_index(self, ch):
return ord(ch) - ord("a")
def insert(self, word):
root = self.root
len1 = len(word)
for i in range(len1):
index = self.get_index(word[i])
if index not in root.children:
root.children[index] = self.get_node()
root = root.children.get(index)
root.terminating = True
def search(self, word):
root = self.root
len1 = len(word)
for i in range(len1):
index = self.get_index(word[i])
if not root:
return False
root = root.children.get(index)
return True if root and root.terminating else False
def delete(self, word):
root = self.root
len1 = len(word)
for i in range(len1):
index = self.get_index(word[i])
if not root:
print("Word not found")
return -1
root = root.children.get(index)
if not root:
print("Word not found")
return -1
else:
root.terminating = False
return 0
def update(self, old_word, new_word):
val = self.delete(old_word)
if val == 0:
self.insert(new_word)
if __name__ == "__main__":
"""
from timeit import timeit
strings = ["pqrs", "pprt", "psst", "qqrs", "pqrs"]
t = Trie()
for word in strings:
t.insert(word)
print(timeit(lambda: t.delete("pprt"), number=10000)) # 0.010122302002855577
"""