songpp

//! leetcode 305 number-of-islands-ii
//! 给你一个大小为 m x n 的二进制网格 grid 。网格表示一张地图，其中，0 表示水，1 表示陆地。
//! 最初，grid 中的所有单元格都是水单元格（即，所有单元格都是 0）。
//! 可以通过执行 addLand 操作，将某个位置的水转换成陆地。给你一个数组 positions ，
//! 其中 positions[i] = [ri, ci] 是要执行第 i 次操作的位置 (ri, ci) 。
//!
//! 返回一个整数数组 answer ，其中 answer[i] 是将单元格 (ri, ci) 转换为陆地后，地图中岛屿的数量。
//! 岛屿 的定义是被「水」包围的「陆地」，通过水平方向或者垂直方向上相邻的陆地连接而成。
//! 你可以假设地图网格的四边均被无边无际的「水」所包围。

songpp

Regular Expression Engine Comparison Chart

Many different applications claim to support regular expressions. But what does that even mean?

Well there are lots of different regular expression engines, and they all have different feature sets and different time-space efficiencies.

The information here is just copied from: http://regular-expressions.mobi/refflavors.html

songpp

use std::cmp::max;
use std::collections::VecDeque;
use std::convert::TryInto;
use std::fmt::Debug;
use std::mem::MaybeUninit;
use std::ptr::slice_from_raw_parts;

use itertools::Itertools;
use itertools::MinMaxResult;

songpp

//! this is a pg_dump archive (only 'directory' output) toc.dat reader.



use bytes::{buf::Buf, BytesMut};
use futures_util::stream::StreamExt;
use tokio_util::codec::*;

use nom::{IResult,
          number::streaming as ns,

songpp

/// doubly linked list in purely safe rust

use std::rc::{Rc, Weak};
use std::cell::RefCell;
use std::fmt::Debug;

type Node<T> = RefCell<Option<T>>;

#[derive(Debug)]
pub struct ListNode<T> {

songpp

This note explains how to build Postgres from source and setup to debug it using LLDB on a Mac. I used this technique to research this article:
http://patshaughnessy.net/2014/10/13/following-a-select-statement-through-postgres-internals

1. Shut down existing postgres if necessary - you don’t want to mess up your existing DB or work :)

$ ps aux | grep postgres
pat               456   0.0  0.0  2503812    828   ??  Ss   Sun10AM   0:11.59 postgres: stats collector process       
pat               455   0.0  0.0  2649692   2536   ??  Ss   Sun10AM   0:05.00 postgres: autovacuum launcher process       
pat               454   0.0  0.0  2640476    304   ??  Ss   Sun10AM   0:00.74 postgres: wal writer process       
pat               453   0.0  0.0  2640476    336   ??  Ss   Sun10AM   0:00.76 postgres: writer process       

songpp

:set -XGADTs
:set -XOverloadedStrings


import Data.Text (Text)
import qualified Data.Text as T
import qualified Data.Text.Lazy.IO as LT

songpp

#

songpp

{
	// Place your snippets for haskell here. Each snippet is defined under a snippet name and has a prefix, body and 
	// description. The prefix is what is used to trigger the snippet and the body will be expanded and inserted. Possible variables are:
	// $1, $2 for tab stops, $0 for the final cursor position, and ${1:label}, ${2:another} for placeholders. Placeholders with the 
	// same ids are connected.
	// Example:
	// "Print to console": {
	// 	"prefix": "log",
	// 	"body": [
	// 		"console.log('$1');",

songpp

#!/usr/bin/env bash

# 用于生成开发用的keystore和trust store以及对应的android端用的bks格式的trust store
# 需要 bcprov-ext-jdk15on-1.46.jar 与这个脚本在同一个目录

SCRIPT_DIR=$(cd "$(dirname "$0")"; pwd);

TARGET_DIR="${SCRIPT_DIR}/new_certs"

KEYSTORE="${TARGET_DIR}/keystore.jks"