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Articles tagged with #stack
Problem Description 503. Next Greater Element II The "Next Greater Element II" problem asks you to find the next greater element for each element in a circular array. For each element, you need to find the first element that is greater than it when...
Stack + Monotonic Stack
Problem Statement 445. Add Two Numbers II You are given two non-empty linked lists representing two non-negative integers. The most significant digit comes first and each of their nodes contains a single digit. Add the two numbers and return the su...
Greedy Monotonic Stack: Building the Lexicographically Smallest String with Safe Character Removal
Problem Description LeetCode 227 Basic Calculator II LeetCode 227 (Basic Calculator II) asks us to evaluate a mathematical expression containing integers and the operators +, -, *, and /. The expression is given as a string with possible spaces, an...
The algorithm uses a stack simulation with a character array to efficiently remove all occurrences of a substring. It processes the string character
