Two Sum Problem | Basic and HashMap Approach | Leetcode 1

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Explained What is Two Sum leetcode problem. What is the basic approach to solve then improved with HashMap solution.

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Комментарии
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beautful explanation out of all the youtube, keep making more

Jepi
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What is the time complexity of using the hashmap compared to the first approach?

Diana-ufqv
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Is it necessary to put again map.put(num, i) without this code is incomplete?

VivekYadav-sgte
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You don't hadmapfor this
you can just for loop (iterate the list) one time to get value
python
def findtarget(lists, target):
for indx, val in enumerate(lists):
first_index = 0
remaining = target - lists[first_index] # so we need to iterate until we get this remaining variable value
if (val == remaining):
return [indx, first_index]


print(findtarget([2, 2, 11, 9], 11))

mohamedrasvi