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HomeLeetCode ProblemsEvaluate the Bracket Pairs of a String
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Medium#1807
LeetCode Problem

Evaluate the Bracket Pairs of a String

You are given a string s that contains some bracket pairs, with each pair containing a non-empty key. You know the values of a wide range of keys. This is represented by a 2D string array knowledge where each knowledge[i] = [keyi, valuei] indicates that key keyi has a value of valuei. You are tasked to evaluate all of the bracket pairs. When you evaluate a bracket pair that contains some key keyi, you will: Each key will appear at most once in your knowledge. There will not be any nested brackets in s. Return the resulting string after evaluating all of the bracket pairs.

ArrayHash TableString

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Problem Breakdown

Understanding the Evaluate the Bracket Pairs of a String Problem

Let's break down this LeetCode problem and understand what makes it challenging in interview settings.

Problem Statement

You are given a string s that contains some bracket pairs, with each pair containing a non-empty key. You know the values of a wide range of keys. This is represented by a 2D string array knowledge where each knowledge[i] = [keyi, valuei] indicates that key keyi has a value of valuei. You are tasked to evaluate all of the bracket pairs. When you evaluate a bracket pair that contains some key keyi, you will: Each key will appear at most once in your knowledge. There will not be any nested brackets in s. Return the resulting string after evaluating all of the bracket pairs.

MediumProblem #1807
LeetCode

Evaluate the Bracket Pairs of a String

Related Topics

ArrayHash TableString

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Get real-time assistance for Evaluate the Bracket Pairs of a String problems during coding interviews. Phantom Code AI provides instant solutions and explanations.

Examples

# Example 1

Input
s = "(name)is(age)yearsold", knowledge = [["name","bob"],["age","two"]]
Output
"bobistwoyearsold"

# Example 2

Input
s = "hi(name)", knowledge = [["a","b"]]
Output
"hi?"

# Example 3

Input
s = "(a)(a)(a)aaa", knowledge = [["a","yes"]]
Output
"yesyesyesaaa"

Constraints

1 <= s.length <= 105
0 <= knowledge.length <= 105
knowledge[i].length == 2
1 <= keyi.length, valuei.length <= 10
s consists of lowercase English letters and round brackets '(' and ')'.
Every open bracket '(' in s will have a corresponding close bracket ')'.
The key in each bracket pair of s will be non-empty.
There will not be any nested bracket pairs in s.
keyi and valuei consist of lowercase English letters.
Each keyi in knowledge is unique.

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Solve Evaluate the Bracket Pairs of a String — You are given a string s that contains some bracket pairs, with each pair contai...

Here's the optimal approach using Array:

def solve(input):
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Time: O(n)  |  Space: O(n)

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Frequently Asked Questions

Common questions about solving Evaluate the Bracket Pairs of a String and using Phantom Code AI during coding interviews.

How does Phantom Code AI help me solve coding problems like Evaluate the Bracket Pairs of a String during interviews?
Phantom Code AI generates complete solutions instantly with proper complexity analysis, letting you focus on explaining your approach and demonstrating problem-solving skills rather than getting stuck on implementation details during high-pressure situations.
What if the interviewer asks follow-up questions or modifications to problems like Evaluate the Bracket Pairs of a String?
Phantom Code AI adapts in real-time. Screenshot the modified problem or use audio mode to capture the interviewer's follow-up, and get an updated solution within seconds — including edge cases and optimizations.
Can Phantom Code AI help me communicate my solution for problems like Evaluate the Bracket Pairs of a String?
Yes. Phantom Code AI provides step-by-step approach explanations with 3 progressive thoughts, so you can walk through your solution naturally. It also provides time and space complexity analysis to discuss trade-offs.
How does Phantom Code AI assist with different programming languages for Evaluate the Bracket Pairs of a String type problems?
Phantom Code AI supports 11 programming languages including Python, Java, C++, JavaScript, TypeScript, Go, Rust, Ruby, Swift, Kotlin, and C#. Set your preferred language and get idiomatic solutions.
What coding mistakes does Phantom Code AI help me avoid during Evaluate the Bracket Pairs of a String interviews?
Phantom Code AI catches common mistakes like off-by-one errors, missing edge cases, incorrect base conditions, and suboptimal approaches. It provides clean, well-structured code that handles all edge cases.
Is Phantom Code AI detectable when solving problems like Evaluate the Bracket Pairs of a String during live interviews?
No. Phantom Code AI runs as an invisible desktop overlay that doesn't appear in screen shares, recordings, or proctoring software. It works with Zoom, HackerRank, CodeSignal, CoderPad, and all major platforms.
How does Phantom Code AI help when I'm struggling with Evaluate the Bracket Pairs of a String style questions under pressure?
The AI provides structured guidance: first the approach (what algorithm/data structure to use and why), then the implementation with clean code, and finally complexity analysis. This helps you think clearly even under pressure.
Does Phantom Code AI work for the coding platforms used in Evaluate the Bracket Pairs of a String interviews?
Yes. Phantom Code AI works with all major coding platforms including LeetCode, HackerRank, CodeSignal, CoderPad, HackerEarth, and any browser-based coding environment.
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