hungtcs

-- 数据库大小
select pg_size_pretty(pg_database_size(current_database()));

-- 只计算table size
select schemaname, pg_size_pretty(sum(pg_relation_size(schemaname || '.' || tablename))) from pg_tables group by schemaname;

hungtcs

export class BitReader {
  private offset: number = 0;
  private bitOffset: number = 0;
  private uint8Array: Uint8Array;

  constructor(buffer: ArrayBuffer) {
    this.uint8Array = new Uint8Array(buffer);
  }

  public read(length: number): number {

hungtcs

export function bubbleSort<T>(list: Array<T>, compare: (a: T, b: T) => number) {
  for(let i = 0, len = list.length; i < len - 1; i++) {
    for (let j = 0; j < len - 1 - i; j ++) {
      const a = list[j];
      const b = list[j + 1];
      if (compare(a, b) > 0) {
        list[j] = b;
        list[j + 1] = a;
      }
    }

hungtcs

import { MatMenuPanel, _MatMenuTriggerBase } from '@angular/material/menu';
import { Directive, ElementRef, HostListener, Input, OnInit } from '@angular/core';

@Directive({
  selector: '[contextMenuTriggerFor]',
})
export class ContextMenuTriggerDirective extends _MatMenuTriggerBase implements OnInit {
  private readonly anchorElement = document.createElement('div');

  @Input('contextMenuTriggerFor')

hungtcs

深色模式

切换深色模式

tell application "System Events"
    tell appearance preferences
        set dark mode to not dark mode
    end tell
end tell

hungtcs

• BFS：广度优先搜索
• DFS：深度优先搜索

BFS 的重点在于队列，而 DFS 的重点在于递归。

namespace A {
  export interface Node {
    value: number,

hungtcs

1. 安装 corkscrew 软件，mac 系统可以直接使用 brew 安装

   brew search corkscrew
   brew install corkscrew

2. 配置 ssh，编辑 ~/.ssh/config 文件，添加 ProxyCommand 配置

hungtcs

const parser = Sandbox.compile('a + b');
const result = parser({ a: 1, b: 2 });

// ---

const parser = Sandbox.compile('a + b + alert', { throwOnUndefined: true });
const result = parser({ a: 1, b: 2 });

hungtcs

重要步骤

中文UI

1. 上传字体到 /storage/assets/xmb/retroactive/font.ttf
2. systemctl stop retroarch
3. vim ~/.config/retroarch/retroarch.cfg
4. change video_font_path = /storage/assets/xmb/retroactive/font.ttf
5. systemctl start retroarch

hungtcs

# Linux：录制当前显示器
# - show_region:  显示录制区域
# - framerate:    录制的帧率
# - video_size:   录制区域的大小
# - $DISPLAY+0,0: `$DISPLAY`：环境变量，当前显示器
#                 `+0,0` 录制区域偏移量
# x11grab: http://underpop.online.fr/f/ffmpeg/help/x11grab.htm.gz
ffmpeg -f x11grab -show_region 1 -framerate 8 -video_size 1024x768 -i $DISPLAY+0,0 -y output.mp4

# MacOS 录制屏幕