mirrors/system-design-primer
1
0
Fork 0
mirror of https://github.com/donnemartin/system-design-primer.git synced 2025-09-17 09:30:39 +03:00
Code Issues Projects Releases Wiki Activity

Reduce remove cost from O(n) to O(1)

Browse Source 
Exchange the item with the last item in the array and then pop it.
This commit is contained in:
john-the-dev
2020-09-10 01:51:02 -07:00
committed by GitHub
parent 53c0cf7de8
commit ab57931249
1 changed files with 2 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
solutions/object_oriented_design/hash_table/hash_map.py
View File

@@ -33,6 +33,7 @@ class HashTable(object):
hash_index = self._hash_function(key) hash_index = self._hash_function(key)
for index, item in enumerate(self.table[hash_index]): for index, item in enumerate(self.table[hash_index]):
if item.key == key: if item.key == key:
del self.table[hash_index][index] self.table[hash_index][index],self.table[hash_index][-1] = self.table[hash_index][-1],self.table[hash_index][index]
self.table[hash_index].pop()
return return
raise KeyError('Key not found') raise KeyError('Key not found')