Published in Coder Life·Jan 21Decode Ways — Leetcode 91Difficulty: Medium; Category: Dynamic Programming — Decode Ways - LeetCode Decode Ways - A message containing letters from A-Z can be encoded into numbers using the following mapping: 'A' -> "1"…leetcode.com After reading the question, it first occurred to me that maybe I need to build a map built from letters and numbers. …Dynamic Programming3 min readDynamic Programming3 min read
Published in Coder Life·Dec 26, 2022Find the Duplicate Number — Leetcode 287Difficulty: Medium; Category: Matrix Find the Duplicate Number - LeetCode Find the Duplicate Number - Given an array of integers nums containing n + 1 integers where each integer is in the…leetcode.com We know all the elements in nums are positive, ranging from 1 to n (the index of them in an array would be 0 to n-1). We iterate over each element n through the array nums and mark its associated index as a negative number nums[abs(n)-1]…Matrix3 min readMatrix3 min read
Published in Coder Life·Nov 27, 2022Binary Tree Traversal — Leetcode 94, 144, 145Difficulty: Easy; Category: Tree — There are three types of DFS traversal: > Preorder: Root, Left, Right > Inorder: Left, Root, Right > Postorder: Left, Right, Root As long as you can remember how the position of the root is placed related to these three order, you can easily solve the problems below. LeetCode 94 — Binary Tree Inorder Traversal Inorder traversal…Binary Tree2 min readBinary Tree2 min read
Published in Coder Life·Nov 24, 2022Second Minimum Node In a Binary Tree — LeetCode 671Difficulty: Easy; Category: Tree Second Minimum Node In a Binary Tree - LeetCode Given a non-empty special binary tree consisting of nodes with the non-negative value, where each node in this tree has…leetcode.com According to the question description, this special binary tree root is with particular nodes that each node has two or zero sub-node and this node will be always smaller or equal to sub-nodes. And our aim is to find the second minimum node in this tree.Binary Tree2 min readBinary Tree2 min read
Published in Geek Culture·Sep 7, 2022Member-onlyLogging module in Python — AdvancedTracking events that happen when your software runs — Continue the shared logger concept mentioned at the end of the previous article. We are going to dig into the use of multiple loggers and set its config by handlers and formatters. Loggers Loggers can be multiple, with different names. What we used in the previous article, including the basicConfig settings…Logging4 min readLogging4 min read
Published in Geek Culture·Aug 31, 2022Member-onlyLogging module in Python — BasicTracking events that happen when your software runs — When the program is executed, the current behavior of the program can be known by outputting background message, and this message is called log. During development, logs help us to track the process of the program, and check the results as well as the message when errors occur, which is…Logging4 min readLogging4 min read
Published in Geek Culture·Jul 29, 2022Member-onlyGoogle Software Engineer Interview PreparationHow do I prepare, the materials I use and interview tips based on my experience — Last December, I was invited to interview as a software engineer at Google. They gave me about three months to prepare, and in this article, I will share in detail how I prepared during this period, the materials I used, and interview tips based on my personal experience. If you…Google Interview5 min readGoogle Interview5 min read
Published in Geek Culture·Jun 26, 2022Member-onlySo I got a Software Engineer interview from GoogleThe interview process and what I've learned from it — Last December, a Google recruiter reached out to me via LinkedIn and shared a job that might be a good fit for me. After a few message discussions, we got on the phone and my Google interview journey began! The interview process basically has four stages: Recruiter phone interview Technical…Google Interview6 min readGoogle Interview6 min read
Published in Geek Culture·May 26, 2022Member-onlyTDD vs BDD - What’s The DifferenceSoftware development process comparison — As the scale of programs increases, whether developing new functions or refactoring, optimizing existing code, etc., automated testing can be used to ensure that the existing functions of the program are not affected (the old behaviours are not changed), and it can also reduce the number of bugs during developing…Tdd6 min readTdd6 min read
Published in Coder Life·Apr 12, 2022Kth Largest Element in a Stream — LeetCode 703Difficulty: Easy; Category: Heap — What is Heap? Heap is a complete binary tree-based data structure. It can be divided into two types: Max-heap: the root node must be the greatest one, and all the parents are greater than their children. Min-heap: the root node must be the smallest one, and all the parents are…Heap2 min readHeap2 min read
