ps -ef | grep java | awk '{print $2}' | xargs kill -9

@Test
public void test11() {

  long start = System.currentTimeMillis();
  int a = 0;
  for(int i=0;i<1000000000;i++){
  try {
      a++;
  }catch (Exception e){
      e.printStackTrace();
  }
  }
  long useTime = System.currentTimeMillis()-start;
  System.out.println("useTime:"+useTime);
}

#!/usr/bin/python3
import json
 
# Python 字典类型转换为 JSON 对象
data = {
'no' : 1,
'name' : 'hello',
'url' : 'http://tangly1024.com'
}
 
json_str = json.dumps(data)
print ("Python 原始数据：", repr(data))
print ("JSON 对象：", json_str)

# R 语言
#file.edit(path.expand(file.path("~", ".Renviron")))
library(telegram.bot)
library(stringr)
# Initiate the bot session using the token from the enviroment variable.
bot = Bot(token = bot_token('your_bot'))
usr_list <- c(12344566, 12345566)

html {
	background-color: red;
}

#include <iostream>
using namespace std;
 
// main() 是程序开始执行的地方
 
int main()
{
   cout << "Hello World"; // 输出 Hello World
   return 0;
}

using System;
namespace HelloWorldApplication
{
   class HelloWorld
   {
  static void Main(string[] args)
  {
     Console.WriteLine("Hello World");
     Console.ReadKey();
  }
   }
}

.section __TEXT,__text,regular,pure_instructions
.macosx_version_min 10, 13
.globl _add_a_b
.p2align 4, 0x90
_add_a_b: ## @add_a_b
.cfi_startproc
## BB#0:
pushq %rbp
Lcfi0:
.cfi_def_cfa_offset 16
Lcfi1:
.cfi_offset %rbp, -16
movq %rsp, %rbp
Lcfi2:
.cfi_def_cfa_register %rbp
movl %edi, -4(%rbp)
movl %esi, -8(%rbp)
movl -4(%rbp), %esi
addl -8(%rbp), %esi
movl %esi, %eax
popq %rbp
retq
.cfi_endproc

.globl _main
.p2align 4, 0x90
_main: ## @main
.cfi_startproc
## BB#0:
pushq %rbp
Lcfi3:
.cfi_def_cfa_offset 16
Lcfi4:
.cfi_offset %rbp, -16
movq %rsp, %rbp
Lcfi5:
.cfi_def_cfa_register %rbp
subq $16, %rsp
movl $1, %edi
movl $2, %esi
movl $0, -4(%rbp)
callq _add_a_b
addq $16, %rsp
popq %rbp
retq
.cfi_endproc

$$ \begin{aligned} AACD \Rightarrow AAAD &= \frac 1 3\newline AACD \Rightarrow AACD &= \frac 1 3 + \frac 1 6 = \frac 1 2 \newline AACD \Rightarrow AACC &= \frac 1 6 \end{aligned} $$

$$ \begin{bmatrix} c_{0}&c_{n-1}&c_{n-2}&\cdots &c_{1}\newline c_{1}&c_{0}&c_{n-1} & \cdots &c_{2}\newline c_{2}&c_{1}&c_{0}&\cdots &c_3 \newline \vdots &\vdots& \vdots&\ddots &\vdots \newline c_{n-1}&c_{n-2}&c_{n-3}&\dots &c_{0} \end{bmatrix} $$

$$ \begin{aligned} \sin 2\theta & = 2\sin \theta \cos \theta \newline & = \cfrac{2 \tan \theta}{1+\tan^2 \theta} \end{aligned} $$

$$ AACD\Rightarrow \left{\begin{matrix} 第1次取值 & 第2次取值 & 概率 & 最终状态\newline A & C,D &= \frac 1 2 \times \frac 2 3= \frac 1 3 &\Rightarrow AAAD \newline A & A &= \frac 1 2 \times \frac 1 3= \frac 1 6 &\Rightarrow AACD \newline C,D & A &= 2 \times \frac 1 4 \times \frac 2 3= \frac 1 3 &\Rightarrow CCAD \newline C,D & C,D &= 2 \times \frac 1 4 \times \frac 1 3= \frac 1 6 &\Rightarrow CCAA \end{matrix}\right. $$