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Articles tagged with #stack
You are keeping the scores for a baseball game with strange rules. At the beginning of the game, you start with an empty record. You are given a list of strings operations, where operations[i] is the i<sup>th</sup> operation you must apply to the rec...
A word is considered valid if: It contains a minimum of 3 characters. It contains only digits (0-9), and English letters (uppercase and lowercase). It includes at least one vowel. It includes at least one consonant. You are given a string word....
A valid parentheses string is either empty "", "(" + A + ")", or A + B, where A and B are valid parentheses strings, and + represents string concatenation. For example, "", "()", "(())()", and "(()(()))" are all valid parentheses strings. A valid p...
Given string num representing a non-negative integer num, and an integer k, return the smallest possible integer after removing k digits from num. LeetCode Problem - 402 import java.util.*; class Solution { public String removeKdigits(String num...
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. Open brackets must be closed in the cor...
Given an array of integers temperatures represents the daily temperatures, return an array answer such that answer[i] is the number of days you have to wait after the i<sup>th</sup> day to get a warmer temperature. If there is no future day for which...
