Created
November 23, 2024 14:00
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Optimized interview code
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| # https://leetcode.com/problems/insert-delete-getrandom-o1/ | |
| def __init__(self): | |
| self.arr = [] | |
| self.map = {} | |
| def insert(self, val: int) -> bool: | |
| if val in self.arr: | |
| return False | |
| self.arr.append(val) | |
| self.map[val] = len(self.arr) - 1 | |
| return True | |
| def remove(self, val: int) -> bool: | |
| if val not in self.arr: | |
| return False | |
| val_ind = self.map[val] | |
| last_val = self.arr[-1] | |
| self.arr[-1] = val | |
| self.arr[val_ind] = last_val | |
| self.map[last_val] = val_ind | |
| self.arr.pop() | |
| del self.map[val] | |
| return True | |
| def getRandom(self) -> int: | |
| if len(self.arr) > 0: | |
| return self.arr[random.randrange(len(self.arr))] |
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