maksadbek

#System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

##Basic Steps

1. 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?

maksadbek

package main

import (
	"fmt"
	"labix.org/v2/mgo"
	"labix.org/v2/mgo/bson"
	"time"
)

type Person struct {

maksadbek

Задание

Реализовать на Ruby с использованием Rails приложение со следующим функционалом:

1. Регистрация / авторизация пользователей.
2. Создание портфеля акций (5-6 акций достаточно) для пользователя: стандартный CRUD.
3. Данные должны скачиваться с Yahoo Finance.
4. Сделать вывод графика "стоимость портфеля от времени" за 2 последних года по выбранным в п.2 акциям.

Требования

maksadbek

Why do compilers even bother with exploiting undefinedness signed overflow? And what are those
mysterious cases where it helps?

A lot of people (myself included) are against transforms that aggressively exploit undefined behavior, but
I think it's useful to know what compiler writers are accomplishing by this.

TL;DR: C doesn't work very well if int!=register width, but (for backwards compat) int is 32-bit on all
major 64-bit targets, and this causes quite hairy problems for code generation and optimization in some
fairly common cases. The signed overflow UB exploitation is an attempt to work around this.

maksadbek

---
title: "Visualizing the Clinton Email Network in R"
author: "hrbrmstr"
date: "`r Sys.Date()`"
output: html_document
---
```{r include=FALSE}
knitr::opts_chunk$set(
  collapse=TRUE,
  comment="#>",

maksadbek

function mapValues(obj, fn) {
  return Object.keys(obj).reduce((result, key) => {
    result[key] = fn(obj[key], key);
    return result;
  }, {});
}

function pick(obj, fn) {
  return Object.keys(obj).reduce((result, key) => {
    if (fn(obj[key])) {

maksadbek

package main

import (
	"net/http"
	"database/sql"
	"fmt"
	"log"
	"os"
)

maksadbek

rmongodb Tutorial

This is a quick document aimed at highlighting the basics of what you might want to do using MongoDB and R. I am coming at this, almost completely, from a SQL mindset.

Install

The easiest way to install, I believe, is

maksadbek

Direct links to free Springer maths books (pdf versions)

duplicates = multiple editions

A Classical Introduction to Modern Number Theory,Kenneth IrelandMichael Rosen

A Classical Introduction to Modern Number Theory,Kenneth IrelandMichael Rosen

A Course in Arithmetic,Jean-Pierre Serre

maksadbek

//Kruskal using Union_Find

#include "stdio.h"
#include "string.h"
#include "vector"
#include "algorithm"
using namespace std;
#define pii pair<int, int>
#define pip pair<int, pii>
#define F first