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one line get max matrix val
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docs/19_python内置常用算法和数据结构/builtins.md

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@@ -128,6 +128,8 @@ presums = list(accumulate([1,2,3])) # [1, 3, 6]
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allsum = sum(map(sum, matrix)) # 或者 allsum = sum((sum(row) for row in matrix))
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# 一行代码判断一个元素是否在矩阵中,比如判断 1 是否在矩阵matrix中
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any(1 in row for row in matrix)
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# 一行代码获取矩阵最大、最小值
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maxval = max(map(max, matrix))
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```
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# python dict 技巧

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