leetcode

문제 Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would have exactly one solution, and you may not use the same element twice. Example: Given nums = [2, 7, 11, 15], target = 9, Because nums[0] + nums[1] = 2 + 7 = 9, return [0, 1].풀이 class Solution: def twoSum(self, nums: List[int], target: int) -> List[int]..

문제 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 "". Example 1: Input: ["flower","flow","flight"] Output: "fl"Example 2: Input: ["dog","racecar","car"] Output: "" Explanation: There is no common prefix among the input strings.Note: All given inputs are in lowercase letters a-z. 풀이 class Solution: def lo..

문제 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, two is written as II in Roman numeral, just two one's added together. Twelve is written as, XII, which is simply X + II. The number twenty seven is written as XXVII, which is XX + V + II. Roman numerals are usually written largest to smallest fro..

문제 Given a 32-bit signed integer, reverse digits of an integer. Example 1: Input: 123 Output: 321Example 2: Input: -123 Output: -321Example 3: Input: 120 Output: 21Note: Assume we are dealing with an environment which could only store integers within the 32-bit signed integer range: [−231, 231 − 1]. For the purpose of this problem, assume that your function returns 0 when the reversed integer ov..