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# Runtime: 121 ms (Top 76.1%) | Memory: 19.55 MB (Top 13.9%)
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class Solution(object):
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    def searchMatrix(self, matrix, target):
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        """
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        :type matrix: List[List[int]]
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        :type target: int
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        :rtype: bool
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        """
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        found = False
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        for X in matrix:
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            for M in X:
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                if M == target:
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                    found = True
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        return found