vayn

<?php

$sum = 2;

for ($i = 3; $i <= 10000; $i++) {
  $k = 1;

  for ($j = 2; $j < $i; $j++) {
    if ($i % $j == 0) {
      $k = 0;

vayn

<?php

define('MAX_NUM', 1000000);
$all = array_fill(0, MAX_NUM, 0);
$i = 2;

if ($all[$i] == 0) {
    echo $i . "\n"; //测试性能时去掉这行。输出会占据大部分时间。
    for ($j = $i; $j < MAX_NUM; $j+=$i) {
        $all[$j] = 1;

vayn

<?php

$sum = 2;

for ($i = 3; $i < 10000; $i+=2) {
  $flag = TRUE;

  for ($j = 2; $j <= sqrt($i); $j++) {
     if ($i % $j == 0) {
       $flag = FALSE;

vayn

/* Design done by Arthur Steiner (c), the rest by Anne van Kesteren (c) */
@font-face { font-family:anneisawesome; src:url(/fonts/big-noodle-titling) }
html { margin:20px 30px; font:1em/1.5 Verdana, sans-serif; background:#46016a }
body { position:relative; margin:0 0 0 160px; padding:0 1em; border-left:10px solid #7e7a4c; min-width:200px; background:#c2c152 }
h1 { position:absolute; top:5px; left:-155px; margin:0; height:107px; width:282px; z-index:1; content:url(/img/logo) "Weblog 4.2"; font:2.6em/0.4 anneisawesome, Impact, sans-serif; text-indent:-4px }
p#tagline { margin:0; padding-top:5em; font-size:1.2em }
form#search { position:absolute; top:10px; right:20px; z-index:1 }
form#search input[type=search] { border:thin solid #000; vertical-align:top }
form#search input[type=search]:focus { outline:thick solid #000 }
form#search input[type=submit] { margin:2px 0 0; padding:0; border:none; float:right; display:block; content:url(/img/find); width:30px; cursor:pointer }

vayn

<?php

function odd($var) {
  return($var & 1);
}

function even($var) {
  return(!($var & 1));
}

vayn

function window.onload()
{
  var olink=document.links;
  for(var i=0; i<olink.length; i++){
    olink[i].onmouseover=function(){window.status='';return true;}
    olink[i].onfocus=function(){window.status='';return true;}
  }
}

vayn

javascript:(function(){readConvertLinksToFootnotes=false;readStyle='style-novel';readSize='size-medium';readMargin='margin-wide';_readability_script=document.createElement('script');_readability_script.type='text/javascript';_readability_script.src='http://lab.arc90.com/experiments/readability/js/readability.js?x='+(Math.random());document.documentElement.appendChild(_readability_script);_readability_css=document.createElement('link');_readability_css.rel='stylesheet';_readability_css.href='http://lab.arc90.com/experiments/readability/css/readability.css';_readability_css.type='text/css';_readability_css.media='all';document.documentElement.appendChild(_readability_css);_readability_print_css=document.createElement('link');_readability_print_css.rel='stylesheet';_readability_print_css.href='http://lab.arc90.com/experiments/readability/css/readability-print.css';_readability_print_css.media='print';_readability_print_css.type='text/css';document.getElementsByTagName('head')[0].appendChild(_readability_print_cs

vayn

sfHover = function() {
    var sfEl = document.getElementById("menu");
    if(sfEl){
        var sfEls = document.getElementById("menu").getElementsByTagName("LI");
        for (var i=0; i<sfEls.length; i++) {
            sfEls[i].onmouseover=function() {
                this.className+=" sfhover";
            }
            sfEls[i].onmouseout=function() {
                this.className=this.className.replace(new RegExp(" sfhover\\b"), "");

vayn

<?php
/*
 * 八皇后问题是一个非常有趣的问题，是由德国大数学家高斯首先提出来的。
 * 要求在国际象棋的棋盘上放置八个皇后，使她们不能互相攻击。
 * 即任何两个皇后不能处在同一行、同一列、同一条斜线上。
 *
 * 问有多少种不同的摆法？并找出所有的摆法。
 *
 * 问题分析：
 * (1) 满足上述条件的八个皇后，必然是每行一个，每列一个。

vayn

# -*- coding:utf-8 -*-
u'''cdays-3-exercise-3.py
    @note: 使用全局变量和函式的递归调用
'''

global col        # 竖直线（列线），用于记录列线冲突状态
global row        # 行号，本代码是逐行放置的，这里的row是可以当做do_queen函数的参数的。
global pos_diag   # 右对角线，用于记录右对角线冲突，拿笔画画就知道有15条左对角线了
global nag_diag   # 左对角线，用于记录左对角线冲突状态，同样也有15条右对角线