.Zzumbong

문제 설명 Given a string s, you can transform every letter individually to be lowercase or uppercase to create another string. Return a list of all possible strings we could create. Return the output in any order. String s 를 받아서 개별적으로 소문자나 대문자로 변환하여, 만들 수 있는 모든 문자열을 Array로 반환한다. 순서는 상관없다. 입출력 예 Example 1: Input: s = "a1b2" Output: ["a1b2","a1B2","A1b2","A1B2"] Example 2: Input: s = "3z4" Output: ["3..

문제 설명 A triplet is an array of three integers. You are given a 2D integer array triplets, where triplets[i] = [ai, bi, ci] describes the ith triplet. You are also given an integer array target = [x, y, z] that describes the triplet you want to obtain. To obtain target, you may apply the following operation on triplets any number of times (possibly zero): Choose two indices (0-indexed) i and j (i..

문제 설명 Write a function to find the longest common prefix string amongst an array of strings. If there is no common prefix, return an empty string "". 문자열 배열 중에 가장 긴 공통 접두사를 찾는 문제, 없으면 ''을 리턴 입출력 예 Example 1: Input: strs = ["flower","flow","flight"] Output: "fl" Example 2: Input: strs = ["dog","racecar","car"] Output: "" Explanation: There is no common prefix among the input strings. Constraints 1

문제 설명 You are given an m x n matrix maze (0-indexed) with empty cells (represented as '.') and walls (represented as '+'). You are also given the entrance of the maze, where entrance = [entrancerow, entrancecol] denotes the row and column of the cell you are initially standing at. In one step, you can move one cell up, down, left, or right. You cannot step into a cell with a wall, and you cannot..

문제 설명 Given an array nums of distinct integers, return all the possible permutations. You can return the answer in any order. 입출력 예 Example 1: Input: nums = [1,2,3] Output: [[1,2,3],[1,3,2],[2,1,3],[2,3,1],[3,1,2],[3,2,1]] Example 2: Input: nums = [0,1] Output: [[0,1],[1,0]] Example 3: Input: nums = [1] Output: [[1]] Constraints 1

문제 설명 Roman numerals are represented by seven different symbols: I, V, X, L, C, D and M. For example, 2 is written as II in Roman numeral, just two ones added together. 12 is written as XII, which is simply X + II. The number 27 is written as XXVII, which is XX + V + II. Roman numerals are usually written largest to smallest from left to right. However, the numeral for four is not IIII. Instead,..

문제 설명 Given a string s, return the longest palindromic substring in s. palindromic: A string is palindromic if it reads the same forward and backward. 입출력 예 Example 1: Input: s = "babad" Output: "bab" Explanation: "aba" is also a valid answer. Example 2: Input: s = "cbbd" Output: "bb" Constraints 1 0; i--) { for(let j = 0; j answer.length){ const word = s.slice(j, i); ..

문제 설명 Given a string s representing a valid expression, implement a basic calculator to evaluate it, and return the result of the evaluation. Note: You are not allowed to use any built-in function which evaluates strings as mathematical expressions, such as eval(). 입출력 예 Example 1: Input: s = "1 + 1" Output: 2 Example 2: Input: s = " 2-1 + 2 " Output: 3 Example 3: Input: s = "(1+(4+5+2)-3)+(6+8)..

문제 설명 A sentence consists of lowercase letters ('a' to 'z'), digits ('0' to '9'), hyphens ('-'), punctuation marks ('!', '.', and ','), and spaces (' ') only. Each sentence can be broken down into one or more tokens separated by one or more spaces ' '. A token is a valid word if all three of the following are true: It only contains lowercase letters, hyphens, and/or punctuation (no digits). Ther..

문제 설명 Given an integer x, return true if x is a palindrome, and false otherwise. palindrome : An integer is a palindrome when it reads the same forward and backward. For example, 121 is a palindrome while 123 is not. 입출력 예 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..

문제 설명 Determine if a 9 x 9 Sudoku board is valid. Only the filled cells need to be validated according to the following rules: Each row must contain the digits 1-9 without repetition. Each column must contain the digits 1-9 without repetition. Each of the nine 3 x 3 sub-boxes of the grid must contain the digits 1-9 without repetition. Note: A Sudoku board (partially filled) could be valid but is..

문제 설명 Given an integer x, return true if x is a palindrome, and false otherwise. palindrome : An integer is a palindrome when it reads the same forward and backward. For example, 121 is a palindrome while 123 is not. 입출력 예 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..

8년 차에 쓰는 첫 개발 회고록 벌써 8년차다. 연차로 치면 8년 차지만 실 근무?로 치면 만 6년 경력으로 주니어는 아니지만 확실히 시니어입니다!라고 하기엔 애매한 상황이다. 시니어와 비교하면 역시나 부족하겠지만 나름 시스템과 프레임워크에 대한 이해나 패키지 개발이나 다양한 프로젝트를 소화하다 보니 실력이 늘어서 자신감은 있지만 성격상 흔히 말하는 찐개발자들이 많기 때문에 항상 겸손하게 일하고 있다. 1. 2015 - 2016 컴공이랑 이름만 다른 컴퓨터 과학을 전공해 14년도 졸업 이후 갈피를 못 잡던 시기에 비개발직군에 취업했다. 현대 1차 밴드 협력업체라는 좋은 타이틀이 있던 전산지원부라는 당시엔 생소한 부서에 입사하였다. 회사 내에 컴퓨터 조달, 수리, 관리 뭐 그런 것도 하고 가끔 자체 프로그..

문제 설명 You are given an array trees where trees[i] = [xi, yi] represents the location of a tree in the garden. You are asked to fence the entire garden using the minimum length of rope as it is expensive. The garden is well fenced only if all the trees are enclosed. Return the coordinates of trees that are exactly located on the fence perimeter. 입출력 예 Example 1: Input: points = [[1,1],[2,2],[2,0]..

문제 설명 Given a binary string s, return the number of non-empty substrings that have the same number of 0's and 1's, and all the 0's and all the 1's in these substrings are grouped consecutively. Substrings that occur multiple times are counted the number of times they occur. 입출력 예 Example 1: Input: s = "00110011" Output: 6 Explanation: There are 6 substrings that have equal number of consecutive ..

문제 설명 Write a program to count the number of days between two dates. The two dates are given as strings, their format is YYYY-MM-DD as shown in the examples. 입출력 예 Example 1: Input: date1 = "2019-06-29", date2 = "2019-06-30" Output: 1 Example 2: Input: date1 = "2020-01-15", date2 = "2019-12-31" Output: 15 Constraints The given dates are valid dates between the years 1971 and 2100. 내 솔루션 차이 나는 일자..

문제 설명 An ugly number is a positive integer whose prime factors are limited to 2, 3, and 5. Given an integer n, return true if n is an ugly number. 입출력 예 Example 1: Input: n = 6 Output: true Explanation: 6 = 2 × 3 Example 2: Input: n = 1 Output: true Explanation: 1 has no prime factors, therefore all of its prime factors are limited to 2, 3, and 5. Example 3: Input: n = 14 Output: false Explanati..

문제 설명 Given the coordinates of two rectilinear rectangles in a 2D plane, return the total area covered by the two rectangles. The first rectangle is defined by its bottom-left corner (ax1, ay1) and its top-right corner (ax2, ay2). The second rectangle is defined by its bottom-left corner (bx1, by1) and its top-right corner (bx2, by2). 입출력 예 Example 1: Input: ax1 = -3, ay1 = 0, ax2 = 3, ay2 = 4, ..

문제 설명 You are given an n x n integer matrix. You can do the following operation any number of times: Choose any two adjacent elements of matrix and multiply each of them by -1. Two elements are considered adjacent if and only if they share a border. Your goal is to maximize the summation of the matrix's elements. Return the maximum sum of the matrix's elements using the operation mentioned above..

문제 설명 We are playing the Guess Game. The game is as follows: I pick a number from 1 to n. You have to guess which number I picked. Every time you guess wrong, I will tell you whether the number I picked is higher or lower than your guess. You call a pre-defined API int guess(int num), which returns three possible results: -1: Your guess is higher than the number I picked (i.e. num > pick). 1: Yo..