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Data Structures

Linked List (20 Q)

• Merge Two Sorted Lists
• Linked List Cycle
• Reverse Linked List
• Middle of the Linked List
• Palindrome Linked List
• Linked List Cycle II
• LRU Cache

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class PythonAT2 < Formula
  desc "Interpreted, interactive, object-oriented programming language"
  homepage "https://www.python.org/"
  url "https://www.python.org/ftp/python/2.7.17/Python-2.7.17.tar.xz"
  sha256 "4d43f033cdbd0aa7b7023c81b0e986fd11e653b5248dac9144d508f11812ba41"
  revision 1
  head "https://github.com/python/cpython.git", :branch => "2.7"

  bottle do
    sha256 "accfaa922708f00afb69ab230199f96e6ecdddd248a1eca586ce1e5e5cfd732b" => :catalina

debodirno

Bash Set Builtin

Use strict modes unless you have a good reason not to:

• Use set -e to abort on errors (nonzero exit code)
• Use set -o pipefail too, to abort on errors within pipes (though read up on it more if you do, as this topic is a bit subtle).
• Use set -u to detect unset variable usages.
• Use set -x (or the variant set -v, which logs raw input, including unexpanded variables and comments) for debugging output.

Reference

1. https://www.gnu.org/software/bash/manual/html_node/The-Set-Builtin.html

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# shortform git commands
alias g='git'

# pretty tab'd git log
git log --graph --pretty="tformat:%h*(%ar)*<%an>*%d %s" $* | sed -Ee 's/(^[^<]*) ago\)/\1)/' | sed -Ee 's/(^[^<]*), [[:digit:]]+ .*months?\)/\1)/' | column -s '*' -t | cat

# change author of all git repos
git filter-branch -f --env-filter "GIT_AUTHOR_NAME='yourname'; GIT_AUTHOR_EMAIL='youremail@example.com'; GIT_COMMITTER_NAME='yourname'; GIT_COMMITTER_EMAIL='youremail@example.com';" HEAD;

# stage only deleted files

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vs Questions

---

1. http://stackoverflow.com/questions/804115 (rebase vs merge).
2. https://www.atlassian.com/git/tutorials/merging-vs-rebasing (rebase vs merge)
3. https://www.atlassian.com/git/tutorials/undoing-changes/ (reset vs checkout vs revert)
4. http://stackoverflow.com/questions/2221658 (HEAD^ vs HEAD~) (See git rev-parse)
5. http://stackoverflow.com/questions/292357 (pull vs fetch)
6. http://stackoverflow.com/questions/39651 (stash vs branch)
7. http://stackoverflow.com/questions/8358035 (reset vs checkout vs revert)

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PROMPT='%(!..%{$fg[red]%}$USER %{$fg[yellow]%})%2~%{$fg[cyan]%}$(git_prompt_info)%{$reset_color%} %{$fg_bold[blue]%}%(!.#.$) '

ZSH_THEME_GIT_PROMPT_PREFIX=" ("
ZSH_THEME_GIT_PROMPT_SUFFIX=")"

debodirno

Below are the Big O performance of common functions of different Java Collections.

List	Add	Remove	Get	Contains	Next	Data Structure
ArrayList	O(1)	O(n)	O(1)	O(n)	O(1)	Array
LinkedList	O(1)	O(1)	O(n)	O(n)	O(1)	Linked List
CopyOnWriteArrayList	O(n)	O(n)	O(1)	O(n)	O(1)	Array

debodirno

alias g='git'

alias ga='git add'
alias gapa='git add --patch'

alias gb='git branch'
alias gbd='git branch -d'
alias gbD='git branch -D'

alias gc='git commit -v'

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Branching

Quick Legend

Description, Instructions, Notes

Instance	Branch

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function secure_array(&$array) {
    // this function secures the content of an array against SQL injection and HTML code injection attacks
    // it works for arrays of any number of dimensions, recursively for each dimension

    if (isset($array)) {
        foreach ($array as $key => $value) {
            if (is_array($array[$key])) {           // if element is array, then go to next dimension
                secure_array($array[$key]);
            } elseif (is_string($array[$key])) {    // if element is a string variable, clean it up
                $array[$key] = $mysqli -> real_escape_string($array[$key]); // replace this with mysql / PDO real escape string function depending on which database connector you are using