How can I solve the Goal Parser Interpretation problem efficiently?

The efficient way to solve this problem is by iterating through the command string and using simple checks to identify and process the 'G', '()', and '(al)' patterns.

What is the expected time complexity for this problem?

The time complexity is O(n), where n is the length of the command string, since each character is processed only once.

Can this problem be solved with constant space?

Yes, the problem can be solved with constant space by directly concatenating the interpreted segments into a result string.

How do I handle multiple consecutive '()' and '(al)' patterns?

Simply continue iterating through the string, treating each '()', '(al)', and 'G' independently and appending the appropriate character or string to the result.

What should I do if the problem adds new patterns?

You can extend the solution by adding more checks to handle new patterns in the same manner as '()', '(al)', and 'G'.

#1678

Easy

auto_awesomeString-driven solution strategy

LeetCode 题解工作台

设计 Goal 解析器

请你设计一个可以解释字符串 command 的 Goal 解析器。 command 由 "G" 、 "()" 和/或 "(al)" 按某种顺序组成。Goal 解析器会将 "G" 解释为字符串 "G" 、 "()" 解释为字符串 "o" ， "(al)" 解释为字符串 "al" 。然后，按原顺序将经…

字符串

题目描述

请你设计一个可以解释字符串 command 的 Goal 解析器 。command 由 "G"、"()" 和/或 "(al)" 按某种顺序组成。Goal 解析器会将 "G" 解释为字符串 "G"、"()" 解释为字符串 "o" ，"(al)" 解释为字符串 "al" 。然后，按原顺序将经解释得到的字符串连接成一个字符串。

给你字符串 command ，返回 Goal 解析器 对 command 的解释结果。

示例 1：

输入：command = "G()(al)"
输出："Goal"
解释：Goal 解析器解释命令的步骤如下所示：
G -> G
() -> o
(al) -> al
最后连接得到的结果是 "Goal"

示例 2：

输入：command = "G()()()()(al)"
输出："Gooooal"

示例 3：

输入：command = "(al)G(al)()()G"
输出："alGalooG"

提示：

1 <= command.length <= 100
command 由 "G"、"()" 和/或 "(al)" 按某种顺序组成

lightbulb

解题思路

方法一：字符串替换

根据题意，只需要将字符串 command 中的 "()" 替换为 'o'，"(al)" 替换为 "al" 即可。

时间复杂度 $O(n)$ ，空间复杂度 $O(n)$ 。其中 $n$ 是字符串 $command$ 的长度。

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class Solution:
    def interpret(self, command: str) -> str:
        return command.replace('()', 'o').replace('(al)', 'al')

speed

复杂度分析

指标	值
时间	Depends on the final approach
空间	Depends on the final approach

psychology

面试官常问的追问

外企场景

question_mark
Candidate shows an understanding of string pattern recognition.
question_mark
The approach demonstrates efficient handling of string manipulation.
question_mark
Candidate is able to optimize for both time and space complexity.

warning

常见陷阱

外企场景

error
Misidentifying the characters '()' and '(al)' could lead to incorrect interpretation of the command.
error
Failing to handle the case where multiple '()' or '(al)' patterns appear consecutively.
error
Inefficient solutions that unnecessarily process characters multiple times or use extra space.

swap_horiz

进阶变体

外企场景

arrow_right_alt
Handle more complex input where the patterns appear in mixed order.
arrow_right_alt
Allow modifications where additional patterns (like '[]') are introduced.
arrow_right_alt
Optimize for very long strings while maintaining performance.

help

常见问题

外企场景

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