Description
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## Semantic Segmentation

图像语义分割(Semantic Segmentation)是图像处理和是机器视觉技术中关于图像理解的重要一环，也是 AI 领域中一个重要的分支。语义分割即是对图像中每一个像素点进行分类，确定每个点的类别（如属于背景、人或车等），从而进行区域划分。目前，语义分割已经被广泛应用于自动驾驶、无人机落点判定等场景中。
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## 542. 01 Matrix

Given a matrix consists of 0 and 1, find the distance of the nearest 0 for each cell.
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## 133. Clone Graph

### 图的深拷贝

Given a reference of a node in a connected undirected graph, return a deep copy (clone) of the graph. Each node in the graph contains a val (int) and a list (List[Node]) of its neighbors.
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## 513. Find Bottom Left Tree Value

You need to find the largest value in each row of a binary tree.
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## 513. Find Bottom Left Tree Value

Given a binary tree, find the leftmost value in the last row of the tree.
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