Boats to Save People LeetCode solution in Python

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class Solution:
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    def numRescueBoats(self, people: List[int], limit: int) -> int:
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        people.sort()
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        lo = 0
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        hi = len(people) - 1
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        boats = 0
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        while lo <= hi:
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            if people[lo] + people[hi] <= limit:
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                lo += 1
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                hi -= 1
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            else:
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                hi -= 1
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            boats += 1
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        return boats