427 dfs
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41
427-240611-pass/main.py
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41
427-240611-pass/main.py
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"""
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# Definition for a QuadTree node.
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class Node:
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def __init__(self, val, isLeaf, topLeft, topRight, bottomLeft, bottomRight):
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self.val = val
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self.isLeaf = isLeaf
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self.topLeft = topLeft
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self.topRight = topRight
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self.bottomLeft = bottomLeft
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self.bottomRight = bottomRight
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"""
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class Solution:
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def construct(self, grid: List[List[int]]) -> 'Node':
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n = len(grid)
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def check_is_leaf(row_start,row_end,column_start,column_end):
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x = grid[row_start][column_start]
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for i in range(row_start, row_end + 1):
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for j in range(column_start, column_end + 1):
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if grid[i][j] != x:
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return 0
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return 1
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def dfs(dim, row, column,node):
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isLeaf = check_is_leaf(row,row+dim -1 , column, column + dim - 1)
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node.isLeaf= isLeaf
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if isLeaf==1:
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node.val=grid[row][column]
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else:
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node.val = 1
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top_left = Node()
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node.topLeft = dfs(dim // 2, row, column, top_left)
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top_right = Node()
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node.topRight = dfs(dim // 2, row, column + dim // 2, top_right)
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bottom_left = Node()
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node.bottomLeft = dfs(dim // 2, row + dim // 2, column, bottom_left)
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bottom_right = Node()
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node.bottomRight = dfs(dim // 2, row + dim // 2, column + dim // 2, bottom_right)
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return node
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root = Node()
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root = dfs(n,0,0,root)
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return root
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