Coin Change II – LeetCode Solution [Medium]
You are given an integer array coins representing coins and an integer amount. Return the number of combinations that make up that amount.
Coin Change – LeetCode Solution [Medium]
You are given an integer vector coins[n] representing coins of different denominations and an integer amount representing a total amount of money.
How to automate replication of MySQL data to AWS Redshift?
We’ll use Rails framework and a Java service for this task. Ruby on Rails, or Rails, is a server-side web application framework written in Ruby under the MIT License.
Custom Randomize | Generate Integers with Equal Probability
Given a function foo(), that returns an integer between 1 and 5 with equal probability. Write a function using foo() that returns an integer between 1 and 7.
Reservoir Sampling
Reservoir sampling is a category of randomised algorithms for choosing a simple random sample, without replacement, of k items
Master-Slave and Multi-Master Database Replication (Quick Notes)
Database replication is usually done to achieve HA (High Availability) and load-sharing purposes. A single member of group is designated as master for a given piece of data and is the only node allowed to modify data.
Floyd-Warshall Algorithm Implementation | All pairs shortest path
Floyd-Warshall algorithm helps in finding the shortest path between all pairs of vertices in a graph.
Directed and Undirected Graphs (Implementation)
A graph consists of two sets, namely V (vertices) and E (Edges). V represents a non-empty sets of vertices present in the graph. While E, represents the set of edges (joining two vertices) in the graph.
Mixins | Diamond Problem
Mixins help avoid problem caused by multiple inheritance namely, Diamond Problem. Diamond problem is the reason why Java doesn’t support multiple inheritance.
Java Notes | Singleton vs Static Class
When Java encounters a call to a method that is found within the object it is treated as a call to that object’s method.