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#!/usr/bin/env python3

import sys

# rowList is a list who the first and last element is 0(which will not be printed)
def print_pascal_triangle_row(row):
	print(" ".join([str(each) for each in row[1 : -1]]))

# @parm n denotes how many rows should it print
def print_pascal_triangle(n):

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• Semantics:
  • assignment:
    • When assigning a variable to another name, eg, a = b, a new object is created. However, no data is copied due to the [copy-on-modify][ref1]
  • In order to xor booleans, use xor(a, b).
  • reminder and quotient
    • %% for reminder and %/% for quotient.
  • For accessing list inside list, [[index]] must be used.
  • For returning a vector from a data.frame or data.table, df[[one_list_index]] must be used.
  • slicing:
• Slicing happens when you [] a container (vector, list, etc) using more than one index, generated by seq or : or c(). The index used can be integers or charaters.

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seq 1 100000000 | parallel -k --pipe "sed 's/[0-9]*/https:\/\/&/'"

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1. tree: Display directory and its child dir (can be controlled via -L level) in tree.

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cygwin/x

First, install cygwin/x. If no mirror are found, google 'cygwin/x mirrors' and you shall find many. Make sure xorg is always installed. Then, open "XWin server" file location from start menu, add -- -listen tcp to the end of target.

WSL

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Install cygwin/x

See here

Putty

Install putty, and then enter your virtual machine's IP, then go to Connection->ssh->X11, click Enable X11 forwarding and give the Xauthority file C:\Cygwin64\C:\cygwin64\home\${YOUR_USERNAME_HERE}\.Xauthority. Save the session with your favorite name to reuse the session.

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       ssize_t read(int fd, void *buf, size_t count);

       ssize_t write(int fd, const void *buf, size_t count);

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#!/usr/bin/env perl

# This short script queries the icecream scheduler to discover what machines are connected,
# and sums the maximum job counts for all x86-64 machines.
# It can be used in your mozconfig as follows:
#   mk_add_options MOZ_MAKE_FLAGS="-j$(icecc-jobs)"
# if this script is on your PATH, and named icecc-jobs

use List::Util qw(sum0);

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Setup multiple git identities & git user informations

/!\ Be very carrefull in your setup : any misconfiguration make all the git config to fail silently ! Go trought this guide step by step and it should be fine 😉

Setup multiple git ssh identities for git

• Generate your SSH keys as per your git provider documentation.
• Add each public SSH keys to your git providers acounts.
• In your ~/.ssh/config, set each ssh key for each repository as in this exemple:

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use core::ffi::c_void;
use core::mem::transmute;
use core::ptr::null_mut;
use core::marker::PhantomData;

/// ErasedFnPointer can either points to a free function or associated one that
/// `&mut self`
struct ErasedFnPointer<'a, T, Ret> {
    struct_pointer: *mut c_void,
    fp: *const (),