📅  最后修改于: 2022-03-11 14:46:40.328000             🧑  作者: Mango
def normalize(tree, row=0, col=0):
try:
node = tree[row][col]
left = normalize(tree, row+1, col*2)
right = normalize(tree, row+1, col*2+1)
return [node, left, right] if left or right else [node]
except:
return None # child index does not exist