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Question :In this challenge, you'll develop a fuction that determinesif agiven piece of text has matching parentheses.we define matching parentheses as a set of symbols that have an opening symobl with a corresponding closing symbol.The opening symbol msut also come before the closing symbol.Although parentheses are traditionally curved characters ( ), we are also considering square brackets [ ]..

Given an array nums with n objects colored red, white, or blue, sort them in-place so that objects of the same color are adjacent, with the colors in the order red, white, and blue.We will use the integers 0, 1, and 2 to represent the color red, white, and blue, respectively.You must solve this problem without using the library's sort function. Example 1:Input: nums = [2,0,2,1,1,0]Output: [0,0,1..

Given string num representing a non-negative integer num, and an integer k, return the smallest possible integer after removing k digits from num. Example 1:Input: num = "1432219", k = 3Output: "1219"Explanation: Remove the three digits 4, 3, and 2 to form the new number 1219 which is the smallest.Example 2:Input: num = "10200", k = 1Output: "200"Explanation: Remove the leading 1 and the number ..

Question :Convert input strint to new string with each word reversed.No punctuation in the string, each word separated by spaces.Casing should remain the same. 주어진 문장을 각각 거꾸로 해서 다시 출력하는 문제입니다. Solution : 이 문제를 풀기 위해서는 valildation과 normalization 그리고 search 알고리즘에 관한 지식이 필요합니다.먼저 입력값이 null거나 빈문자열인지를 확인한후 스페이스로 구분하여 배열에 저장하는 과정을 거칩니다.그런후 입력된 값을 거꾸로 반환 시켜 새로운 문자을 완성시킵니다.using System.Text;public class..

Palindrome : 회문(回文) 또는 팰린드롬(palindrome)은 거꾸로 읽어도 제대로 읽는 것과 같은 문장이나 낱말, 숫자, 문자열(sequence of characters) 등입니다. Question :A phrase is a palindrome if, after converting all uppercase letters into lowercase letters and removing all non-alphanumeric characters, it reads the same forward and backward. Alphanumeric characters include letters and numbers. Given a string s, return true if it is a palindro..

Palindrome : 회문(回文) 또는 팰린드롬(palindrome)은 거꾸로 읽어도 제대로 읽는 것과 같은 문장이나 낱말, 숫자, 문자열(sequence of characters) 등입니다. Question:Given an integer x, return true if x is a palindrome, and false otherwise. Example 1: Input: x = 121 Output: true Explanation: 121 reads as 121 from left to right and from right to left.  Example 2: Input: x = -121 Output: false Explanation: From left to right, it reads -121. Fro..

Question:Roman numerals are represented by seven different symbols: I, V, X, L, C, D and M. Symbol       Value I             1 V             5 X             10 L             50 C             100 D             500 M             1000For example, 2 is written as II in Roman numeral, just two one's added together. 12 is written as XII, which is simply X + II. The number 27 is written as XXVII, which..

Question: Given two sorted arrays nums1 and nums2 of size m and n respectively, return the median of the two sorted arrays. The overall run time complexity should be O(log (m+n)). Example 1: Input: nums1 = [1,3], nums2 = [2] Output: 2.00000 Explanation: merged array = [1,2,3] and median is 2. Example 2: Input: nums1 = [1,2], nums2 = [3,4] Output: 2.50000 Explanation: merged array = [1,2,3,4] and..

Question: You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order, and each of their nodes contains a single digit. Add the two numbers and return the sum as a linked list. You may assume the two numbers do not contain any leading zero, except the number 0 itself. Example 1: Input: l1 = [2,4,3], l2 = [5,6,4] Output: [7,0,8] Explanat..

Question: Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target. You may assume that each input would have exactly one solution, and you may not use the same element twice. You can return the answer in any order. Example 1: Input: nums = [2,7,11,15], target = 9 Output: [0,1] Explanation: Because nums[0] + nums[1] == 9, we return ..