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

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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
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3
solutions/object_oriented_design/hash_table/hash_map.py
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@@ -33,6 +33,7 @@ class HashTable(object):
hash_index = self._hash_function(key)
for index, item in enumerate(self.table[hash_index]):
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
raise KeyError('Key not found')