Valid Parenthesis
Given a string s containing just the characters ‘(‘, ‘)’, ‘{‘, ‘}’, ‘[‘ and ‘]’, determine if the input string is valid. An input string is valid if: Open brackets must be closed by the same type of brackets. … Read More
Category: Stack
735. Asteroid Collision – Leetcode – Java – Explanation
Problem statement We are given an array asteroids of integers representing asteroids in a row. For each asteroid, the absolute value represents its size, and the sign represents its direction (positive meaning … Read More
Evaluate String Expression Java | InFix Expression Evaluation Java
Evaluate an expression represented by a StringThe expression can contain parentheses, you can assume parentheses are well-matched. For simplicity, you can assume only binary operations allowed are +, -, *, … Read More