⭐️ # 題目敘述 Given a function fn , return a new function that is identical to the original function except that it ensures fn is called at most once. The first time the returned function is called, it should return the same result as fn . Every subsequent time it is called, it should return undefined...

⭐️ # 題目敘述 You are given a 0-indexed 2D integer array questions where questions[i] = [pointsi, brainpoweri] . The array describes the questions of an exam, where you have to process the questions in order (i.e., starting from question 0 ) and make a decision whether to solve or skip each question....

⭐️ # 題目敘述 Given an array of functions [f1, f2, f3, ..., fn] , return a new function fn that is the function composition of the array of functions. The function composition of [f(x), g(x), h(x)] is fn(x) = f(g(h(x))) . The function composition of an empty list of functions is the identity function...

⭐️⭐️⭐️ # 題目敘述 You are given two integer arrays nums1 and nums2 . We write the integers of nums1 and nums2 (in the order they are given) on two separate horizontal lines. We may draw connecting lines: a straight line connecting two numbers nums1[i] and nums2[j] such that: nums1[i] == nums2[j] ,...

⭐️ # 題目敘述 Given an integer array nums , a reducer function fn , and an initial value init , return a reduced array. A reduced array is created by applying the following operation: val = fn(init, nums[0]) , val = fn(val, nums[1]) , val = fn(val, nums[2]) , ... until every element in the array has...

⭐️ # 題目敘述 Given a positive integer n , generate an n x n matrix filled with elements from 1 to n^2 in spiral order. # Example 1: Input: n = 3 Output: [[1,2,3],[8,9,4],[7,6,5]] # Example 2: Input: n = 1 Output: [[1]] # 解題思路 # Solution class Solution { public int[][] generateMatrix(int...

⭐️ # 題目敘述 Given an integer array arr and a filtering function fn , return a new array with a fewer or equal number of elements. The returned array should only contain elements where fn(arr[i], i) evaluated to a truthy value. Please solve it without the built-in Array.filter method. # Example...

⭐️⭐️⭐️ # 題目敘述 Given an m x n matrix , return all elements of the matrix in spiral order. # Example 1: Input: matrix = [[1,2,3],[4,5,6],[7,8,9]] Output: [1,2,3,6,9,8,7,4,5] # Example 2: Input: matrix = [[1,2,3,4],[5,6,7,8],[9,10,11,12]] Output: [1,2,3,4,8,12,11,10,9,5,6,7] # 解題思路 #...

⭐️ # 題目敘述 Given an integer array arr and a mapping function fn , return a new array with a transformation applied to each element. The returned array should be created such that returnedArray[i] = fn(arr[i], i) . Please solve it without the built-in Array.map method. # Example 1: Input: arr =...

⭐️⭐️ # 題目敘述 Given a square matrix mat , return the sum of the matrix diagonals. Only include the sum of all the elements on the primary diagonal and all the elements on the secondary diagonal that are not part of the primary diagonal. # Example 1: Input: mat = [[1,2,3], [4,5,6], [7,8,9]] Output:...