Background I'm trying clang -Wall on a codebase that I maintain, and the following functions are triggering warnings. Question Why does clang think these are unused? See the // USED! comments near the bottom of each listing below. input.c:162:7: warning: variable 'nwire' set but not used [-Wunu...

(This post is the continuation of Snail matrix in Java.) As previously, a snail matrix is any square matrix \$M_n = \mathbb{N}^{n \times n}\$ with cell elements from the set \$\{ 1, 2, \ldots, n^2 \}\$ such that they resemble the snail pattern. For example, for \$n = 4\$, \$M_n\$ looks like that:...

Once again, in the previous version, Alexander Ivanchenko helped me with his awesome answer. Now, I have improved the toString() and, also, generalized the class to handle matrices of any dimensions, not only square indices. Code package com.github.coderodde.fun.snailmatrix; import java.util.Ar...

I am running into a weird case where the compile is complaining about raw use of parameterized class. I understand the problem but I am not sure how to fix it. public enum Notify { CHAT, EMAIL } public interface NotifyMessageCreator<T> { Collection<Messages> createMessages(T t); Notify g...

I began creating blackjack in python; however, I'm looking to simulate it, so I'm thinking I'm going to need to optimize it so that I don't just leave my computer running for three hours waiting for just 3000 games to be simulated. I'm very new to this stuff so feel free to be as hard on me as yo...

This is a follow-up question for Image Rotation and Transpose Functions Implementation in C++ and An Updated Multi-dimensional Image Data Structure with Variadic Template Functions in C++. I am trying to implement another image rotation function with shear transformation in this post. As another ...

Question: There are n students, numbered from 1 to n, each with their own yearbook. They would like to pass their yearbooks around and get them signed by other students. You're given a list of n integers arr[1..n], which is guaranteed to be a permutation of 1..n (in other words, it includes the i...

I am writing code for a simple 'Profiler', using a struct, a hashmap, Options, and some methods. I call the profiler at many places in my code with the functions names, and the hashmap gets fed, linking function names with their performances. A function can be called many times, and the total run...

I have two extremely simple toy implementations of an event loop, and would like to understand the performance differences between them. First impl - events with a virtual 'handle' method - dynamic dispatch: #include <memory> #include <vector> class Event { public: virtual bool handl...