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Python题库第5题:生成所有可能的括号()组合

  • 2026-06-30 12:15:51
Python题库第5题:生成所有可能的括号()组合

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括号生成(中等难度)题目描述:数字 n 代表生成括号的对数,请你设计一个函数,能够生成所有可能的并且有效的括号组合。有效括号组合需满足:左括号必须以正确的顺序闭合。
# 示例输入:n = 3输出:["((()))""(()())""(())()""()(())""()()()"]输入:n = 1输出:["()"]
2.要求:不能使用 itertools 等现成组合库。时间复杂度 O(4^n / √n)(卡特兰数相关),空间复杂度 O(n)(不计输出)。
3.思路说明
a.约束条件:左括号数量不能超过 n。右括号数量不能超过左括号数量(否则会出现 )( 无效情况)。
b.回溯:递归地尝试添加左括号或右括号,直到字符串长度达到 2*n。
c.剪枝:当 right >= left 时不能再加右括号,保证了括号序列始终有效。
d.复杂度:生成卡特兰数个结果,每个结果长度为 O(n),总时间复杂度 O(4^n / √n)。
这是括号生成的经典解法,简洁且易于理解。

↓ 完整源码如下 ↓

# -*- coding: utf-8 -*-# @Author : 小红牛# 微信公众号:wdPythondef generate_parenthesis(n: int):    """    生成所有有效的括号组合。    参数:        n: 括号对数    返回:        List[str]: 所有有效组合的列表    """    result = []    def backtrack(current: str, left: int, right: int):        """        current: 当前构建的字符串        left: 已使用的左括号数量        right: 已使用的右括号数量        """        if len(current) == 2 * n:            result.append(current)            return        # 只要还有左括号,就可以添加左括号        if left < n:            backtrack(current + '(', left + 1, right)        # 只有右括号数量小于左括号数量时,才能添加右括号        if right < left:            backtrack(current + ')', left, right + 1)    backtrack(""00)    return result# 测试用例if __name__ == "__main__":    print(generate_parenthesis(3))    # 输出: ['((()))', '(()())', '(())()', '()(())', '()()()']    print(generate_parenthesis(1))  # ['()']    print(generate_parenthesis(2))  # ['(())', '()()']

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  1. CONNECT:[ UseTime:0.000701s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000989s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000349s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000314s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000646s ]
  6. SELECT * FROM `set` [ RunTime:0.000233s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000546s ]
  8. SELECT * FROM `article` WHERE `id` = 491311 LIMIT 1 [ RunTime:0.002004s ]
  9. UPDATE `article` SET `lasttime` = 1783090659 WHERE `id` = 491311 [ RunTime:0.006013s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000287s ]
  11. SELECT * FROM `article` WHERE `id` < 491311 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000755s ]
  12. SELECT * FROM `article` WHERE `id` > 491311 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.029792s ]
  13. SELECT * FROM `article` WHERE `id` < 491311 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.053447s ]
  14. SELECT * FROM `article` WHERE `id` < 491311 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.025273s ]
  15. SELECT * FROM `article` WHERE `id` < 491311 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.014363s ]
0.207985s