1
class Solution:
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    def replaceElements(self, arr: List[int]) -> List[int]:
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        maxright = arr[-1]
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        for i in range(len(arr) - 1, -1, -1):
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            temp = arr[i]
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            arr[i] = maxright
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            if temp > maxright:
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                maxright = temp
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        arr[-1] = -1
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        return arr