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[Javascript] 13. Roman to Integer 쉬운설명 - 해시맵

13. Roman to Integer 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 1000 For 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 is XX + V + II. Roman numerals are usually written largest to smallest from ..

[JavaScript]45. Jump Game II

45. Jump Game II Given an array of non-negative integers nums, you are initially positioned at the first index of the array. Each element in the array represents your maximum jump length at that position. Your goal is to reach the last index in the minimum number of jumps. You can assume that you can always reach the last index. Example 1: Input: nums = [2,3,1,1,4] Output: 2 Explanation: The min..

994. Rotting Oranges 쉬운설명 BFS 사용

994. Rotting Oranges You are given an m x n grid where each cell can have one of three values: 0 representing an empty cell, 1 representing a fresh orange, or 2 representing a rotten orange. Every minute, any fresh orange that is 4-directionally adjacent to a rotten orange becomes rotten. Return the minimum number of minutes that must elapse until no cell has a fresh orange. If this is impossibl..

[JavaScript] 991. Broken Calculator 쉬운 설명

991. Broken Calculator There is a broken calculator that has the integer startValue on its display initially. In one operation, you can: multiply the number on display by 2, or subtract 1 from the number on display. Given two integers startValue and target, return the minimum number of operations needed to display target on the calculator. Example 1: Input: startValue = 2, target = 3 Output: 2 E..