Gopythor

Given an array nums of n integers where nums[i] is in the range [1, n], return an array of all the integers in the range [1, n] that do not appear in nums. Example 1: Input: nums = [4,3,2,7,8,2,3,1] Output: [5,6]Example 2: Input: nums = [1,1] Output: [2]Constraints: n == nums.length 1 0 { missing = append(missing, i+1) } } return missing } func abs(x int) int { if x > 0 { return x } return -x }s..

Go/Leet Code 2022. 3. 19. 22:49

Given an integer array nums, return the third distinct maximum number in this array. If the third maximum does not exist, return the maximum number. Example 1: Input: nums = [3,2,1] Output: 1 Explanation: The first distinct maximum is 3. The second distinct maximum is 2. The third distinct maximum is 1. Example 2: Input: nums = [1,2] Output: 2 Explanation: The first distinct maximum is 2. The se..

Go/Leet Code 2022. 3. 19. 17:18

QuickSort Divide and conquer algorithm After determining the pivot, the position of the pivot is confirmed and aligned Quicksort has many variations based on pivot. When comparing numbers, the pivot is the standard. The speed varies depending on the position of the pivot. There are left pivot, right pivot, middle pivot, and random pivot. O(n²) in the worst case Range, Criteria, Compare, Swap qui..

Go/Study record 2022. 3. 17. 18:44

The Pipeline Pattern https://blog.golang.org/pipelines A concurrent pattern A series of 'stages' connected by channels Each stage is a group of goroutines running the same function So what is the pipeline design pattern and detailed article covering the pattern can be found in the link shown here. Pipeline is a design pattern that makes have used of go's concurrency. And devides code..

Go/Mastering Go 2022. 3. 11. 00:50

Go Concurrency Composition of multiple independent operations. Goroutine : An independently executed function, launched by the goroutine. Goroutines are cheap threads, but not reaparallel. Go channel : A way for goroutines to communicate. Go channels block till data is sent. Buffered Go channels block only when the buffer is full. So let's take a refresher into how concurrency works in Go. Concu..

Go/Mastering Go 2022. 3. 11. 00:29

What is the Builder Pattern? Creational pattern Build complicated objects piect by piece So what is the builder pattern? It is considered a creational pattern like the factory pattern. However it differs when it comes to how it builds an object. The builder pattern is used to create an object by putting its pieces together first before instaniating it. The pattern relies on a builder object whic..

Go/Study record 2022. 2. 27. 21:32

What is the Singleton Pattern An object gets created only once then reused. Let's start by defining the singleton design pattern that is simply and object that get created only once in our code. And then gets used again and again We don't create multiple instances often. Why use the Singleton Pattern When the object needs to keep state throughout our program. The singleton pattern is useful when..

Go/Mastering Go 2022. 2. 26. 00:44

You are given two integer arrays nums1 and nums2, sorted in non-decreasing order, and two integers m and n, representing the number of elements in nums1 and nums2 respectively. Merge nums1 and nums2 into a single array sorted in non-decreasing order. The final sorted array should not be returned by the function, but instead be stored inside the array nums1. To accommodate this, nums1 has a lengt..

Go/Leet Code 2022. 2. 25. 03:48