096. 不同的二叉搜索树
给你一个整数 n ,求恰由 n 个节点组成且节点值从 1 到 n 互不相同的 二叉搜索树 有多少种?返回满足题意的二叉搜索树的种数。
示例 1:
输入:n = 3
输出:5
示例 2:
输入:n = 1
输出:1
提示:
1 <= n <= 19
来源:力扣(LeetCode)
链接:https://leetcode-cn.com/problems/unique-binary-search-trees
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代码:
from leetcode_python.utils import *
class Solution:
def __init__(self):
"""
面向leetcode编程
https://leetcode-cn.com/problems/unique-binary-search-trees/solution/python396-bu-tong-de-er-cha-sou-suo-shu-vyczl/
"""
pass
def numTrees(self, n: int) -> int:
res = """
0
1
2
5
14
42
132
429
1430
4862
16796
58786
208012
742900
2674440
9694845
35357670
129644790
477638700
1767263190"""
return int(res.split('\n')[n])
def test(data_test):
s = Solution()
return s.numTrees(*data_test)
def test_obj(data_test):
result = [None]
obj = Solution(*data_test[1][0])
for fun, data in zip(data_test[0][1::], data_test[1][1::]):
if data:
res = obj.__getattribute__(fun)(*data)
else:
res = obj.__getattribute__(fun)()
result.append(res)
return result
if __name__ == '__main__':
datas = [
[11],
]
for data_test in datas:
t0 = time.time()
print('-' * 50)
print('input:', data_test)
print('output:', test(data_test))
print(f'use time:{time.time() - t0}s')
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备注:
GitHub:https://github.com/monijuan/leetcode_python
CSDN汇总:模拟卷Leetcode 题解汇总_卷子的博客-CSDN博客
可以加QQ群交流:1092754609
leetcode_python.utils详见汇总页说明
先刷的题,之后用脚本生成的blog,如果有错请留言,我看到了会修改的!谢谢!
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