yzyzsun

The summation challenge, extended from the classical a-plus-b problem, is a
programming challenge for beginners. A programmer is asked to write a program to
read multiple integers separated by whitespace from a single line and then print
out their sum. Although not difficult, different solutions to this problem can
exhibit different characteristics of programming languages. Once I start to
learn a new language, I will add a new solution here.

yzyzsun

newtype Rec a = Fold { unfold :: Rec a -> a }

fix :: (a -> a) -> a
fix f = (\x -> f (unfold x x)) (Fold (\x -> f (unfold x x)))

yzyzsun

#include <stdio.h>
#include <string.h>

#include <pthread.h>
#include <sys/socket.h>
#include <arpa/inet.h>

#define SERV_PORT  4746
#define BACKLOG    10
#define DATA_LEN   100000

yzyzsun

# fino-time.zsh-theme
# Modified by yzyzsun on 2018-06-12

# Use with a dark background and 256-color terminal.

# Borrowing shamelessly from these oh-my-zsh themes:
#   bira
#   robbyrussell
#
# Also borrowing from http://stevelosh.com/blog/2010/02/my-extravagant-zsh-prompt/

yzyzsun

exampleWithNumber: x
  |y|
  true & false not & (nil isNil) ifFalse: [self halt].
  y := self size + super size.
  #($a #a 'a' 1 1.0)
    do: [:each | Transcript
                 show: (each class name);
                 show: (each printString);
                 show: ' '].
  ^ x < y

yzyzsun

cd /etc/yum.repos.d
curl -O https://copr.fedorainfracloud.org/coprs/librehat/shadowsocks/repo/epel-7/librehat-shadowsocks-epel-7.repo
yum -y install shadowsocks-libev
setcap CAP_NET_BIND_SERVICE=+eip /usr/bin/ss-server
cat > /etc/shadowsocks-libev/config.json << 'EOF'
{
  "server": "0.0.0.0",
  "server_port": 443,
  "password": "p@$$w0rd",
  "method": "aes-128-gcm"