Kang-Li (Stephen) Cheng kanglicheng

Umbrella Challenge

Given a number of people N and an array of integers, each one representing the amount of people a type of umbrella can handle, output the minimum number of umbrellas needed to handle N people.

No umbrella could have left spaces. Which means if a umbrella can handle 2 people, there should be 2 people under it.

If there's no solution, return -1.

Examples

Basic Steps

Clarify and agree on the scope of the system

User cases (description of sequences of events that, taken together, lead to a system doing something useful)
- Who is going to use it?
- How are they going to use it?
Constraints
- Mainly identify traffic and data handling constraints at scale.
- Scale of the system such as requests per second, requests types, data written per second, data read per second)

1. High-Level Design

Key Components

The key components of the system are:

Frontend: The web and mobile applications that users interact with to select and navigate routes.
Backend API: The API that provides the predefined routes to the frontend and stores completed routes for users.
User service: The service that handles user operations. Such as following and viewing other users and modifying user profiles
Route service: The service that handles route operations. Such as creating, updating, and deleting routes.
Real-time location tracking service: The service that tracks the position of other users navigating the same route in real-time.

Design Systems

A Design System isn’t a Project. It’s a Product, Serving Products.: Shifting Focus from Design and Development to Managing and Marketing a System

Defining Design Systems: Getting to the Root of What Your System Really Is

A Design System’s Reach: Practical Levels to Discuss How Broadly Your System Applies

Design Systems are for People: A transcript of Jina Anne's presentation for Design Systems Coalition NYC

See the original quiz here

Question 1

var foo = function foo() {
    console.log(foo === foo);  
};
foo();

Answer: `true`

OCaml build tools: What would you change?

Having a coherent OCaml toolchain distribution.

Improve cross compilation experience

Improve docs

more integration, e.g. Rust's cargo style

Learn functional programming with the OCaml programming language

Registrations are open!

Functional programming is attracting interest from a broad range of developers because it allows to write expressive, concise and elegant programs.

The course "Introduction to Functional programming using the OCaml language" introduces gradually the central notions of functional programming, via a set of video courses that are complemented by a

	#!/bin/bash

	# Install
	brew install llvm
	brew install libomp

	# Compile
	# clang++ test.cpp -o test -Xpreprocessor -fopenmp -lomp

	// Solves this problem: http://1mage.us/1339.

	package main

	import (
	"fmt"
	"math"
	"math/rand"
	"sort"

	import z3

	def add_constraints(s, inp):
	for digit in inp:
	s.add(digit > 0)
	s.add(digit < 200)

	b = [(6,10,11),(9,12,13),(15,16,17),(6,9,15),(10,12,16),(11,13,17), (6,12,17),(11,12,15)]
	a = [(1,2,3),(4,5,6),(7,8,9),(1,4,7),(2,5,8),(3,6,9), (1,5,9),(3,5,6)]
	c = [(18,7,8),(19,20,14),(21,22,23),(18,19,21),(7,20,22),(8,14,23), (18,20,23),(21,20,8)]