How to Delete N Nodes After M Nodes of a Linked List?
Given the head of a linked list and two integers m and n. Traverse the linked list and remove some nodes in the following way: Start with the head …
Bruteforce Algorithm to Find the Unique Positive Integer Whose Square has the form 1_2_3_4_5_6_7_8_9_0 (Concealed Square)
Find the unique positive integer whose square has the form 1_2_3_4_5_6_7_8_9_0, where each “_” is a single digit. The “_” may not be the same digit. If it is …
Clone (Deep Copy) Binary Tree With Random Pointer using Hash Map and Recursion
A binary tree is given such that each node contains an additional random pointer which could point to any node in the tree or null. Return a deep copy …
How to Compute Running Sum of 1d Array using std::partial_sum in C++?
Given an array nums. We define a running sum of an array as runningSum = sum(nums…nums). Return the running sum of nums. Example 1: Input: nums = Output: Explanation: …
How to Renew the Free SSL Certificates (Nginx Server)?
Nowadays, you can easily get a free SSL certificate but you have to manually/automatically renew it every 90 days. To apply for a certificate, you have to verify your …
Design: How to Solve 503 Error of API when Resources are not available?
The HTTP 503 Error indidicates the server is busy. It might be due to the fact that the servers are overloaded (high load average). One of my API is …