Leetcode Problem 20. Valid Parentheses

20. Valid Parentheses

Leetcode Solutions

Using a Stack to Validate Parentheses

  1. Initialize an empty stack.
  2. Iterate over each character in the string.
  3. If the character is an opening bracket ('(', '{', '['), push it onto the stack.
  4. If the character is a closing bracket (')', '}', ']'), check the top of the stack: a. If the stack is empty or the top of the stack is not the corresponding opening bracket, return false. b. If the top of the stack is the corresponding opening bracket, pop the top of the stack.
  5. After processing all characters, if the stack is empty, return true. Otherwise, return false.
UML Thumbnail

Iterative Comparison without Explicit Stack

Ask Question

Programming Language
image/screenshot of info(optional)
Full Screen
Loading...

Suggested Answer

Answer
Full Screen
Copy Answer Code
Loading...