x is a list and y is a dictionary:x = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]y = {1: True, 2: True, 3: True, 4: True, 5: True, 6: True, 7: True, 8: True, 9: True, 10: True}Given a random number as input, would it be faster to check if it is present as an element in x or as a key in y?Searching for an item in a list is faster, so xSearching for a key in a dictionary is faster, so yBoth would take the same timeDepends on the input
Question
x is a list and y is a dictionary:x = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]y = {1: True, 2: True, 3: True, 4: True, 5: True, 6: True, 7: True, 8: True, 9: True, 10: True}Given a random number as input, would it be faster to check if it is present as an element in x or as a key in y?Searching for an item in a list is faster, so xSearching for a key in a dictionary is faster, so yBoth would take the same timeDepends on the input
Solution
Searching for a key in a dictionary is faster, so y. This is because searching for a key in a dictionary is a constant time operation, regardless of the size of the dictionary. On the other hand, searching for an item in a list is a linear time operation, as in the worst case scenario, every element in the list needs to be checked. Therefore, if you have a large amount of data, using a dictionary can be significantly faster.
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