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@@ -626,7 +626,7 @@ $$
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```python title="space_complexity.py"
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def constant(n: int) -> None:
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""" 常数阶 """
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"""常数阶"""
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# 常量、变量、对象占用 O(1) 空间
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a: int = 0
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nums: list[int] = [0] * 10000
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@@ -831,7 +831,7 @@ $$
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```python title="space_complexity.py"
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def linear(n: int) -> None:
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""" 线性阶 """
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"""线性阶"""
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# 长度为 n 的列表占用 O(n) 空间
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nums: list[int] = [0] * n
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# 长度为 n 的哈希表占用 O(n) 空间
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@@ -998,9 +998,10 @@ $$
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```python title="space_complexity.py"
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def linear_recur(n: int) -> None:
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""" 线性阶(递归实现) """
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"""线性阶(递归实现)"""
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print("递归 n =", n)
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if n == 1: return
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if n == 1:
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return
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linear_recur(n - 1)
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```
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@@ -1129,7 +1130,7 @@ $$
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```python title="space_complexity.py"
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def quadratic(n: int) -> None:
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""" 平方阶 """
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"""平方阶"""
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# 二维列表占用 O(n^2) 空间
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num_matrix: list[list[int]] = [[0] * n for _ in range(n)]
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```
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@@ -1277,8 +1278,9 @@ $$
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```python title="space_complexity.py"
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def quadratic_recur(n: int) -> int:
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""" 平方阶(递归实现) """
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if n <= 0: return 0
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"""平方阶(递归实现)"""
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if n <= 0:
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return 0
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# 数组 nums 长度为 n, n-1, ..., 2, 1
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nums: list[int] = [0] * n
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return quadratic_recur(n - 1)
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@@ -1407,8 +1409,9 @@ $$
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```python title="space_complexity.py"
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def build_tree(n: int) -> TreeNode | None:
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""" 指数阶(建立满二叉树) """
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if n == 0: return None
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"""指数阶(建立满二叉树)"""
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if n == 0:
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return None
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root = TreeNode(0)
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root.left = build_tree(n - 1)
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root.right = build_tree(n - 1)
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