• ## Escape

2017-09-12 21:49:51
The princess is going to escape the dragon's cave, and she needs to plan it carefully. The princess runs at vp miles per hour, and the dragon flies at vdmiles per hour. The drago
把路程的计算公式推导出来就行了

The princess is going to escape the dragon's cave, and she needs to plan it carefully.
The princess runs at vp miles per hour, and the dragon flies at vdmiles per hour. The dragon will
discover the escape after t hours and will chase the princess immediately. Looks like there's no chance to success, but the princess noticed that the dragon is very greedy and not too smart. To delay him, the princess
decides to borrow a couple of bijous from his treasury. Once the dragon overtakes the princess, she will drop one bijou to distract him. In this case he will stop, pick up the item, return to the cave and spend f hours
to straighten the things out in the treasury. Only after this will he resume the chase again from the very beginning.
The princess is going to run on the straight. The distance between the cave and the king's castle she's aiming for is c miles. How many bijous will she need to take from the treasury to be able to reach the castle?
If the dragon overtakes the princess at exactly the same moment she has reached the castle, we assume that she reached the castle before the dragon reached her, and doesn't need an extra bijou to hold him off.

Input

The input data contains integers vp, vd, t, f and c, one per line (1 ≤ vp, vd ≤ 100, 1 ≤ t, f ≤ 10, 1 ≤ c ≤ 1000).

Output

Output the minimal number of bijous required for the escape to succeed.

Example

Input
1
2
1
1
10

Output
2

Input
1
2
1
1
8

Output
1

Note

In the first case one hour after the escape the dragon will discover it, and the princess will be 1 mile away from the cave. In two hours the dragon will overtake the princess 2 miles away from the cave, and she will need to drop the first bijou. Return
to the cave and fixing the treasury will take the dragon two more hours; meanwhile the princess will be 4 miles away from the cave. Next time the dragon will overtake the princess 8 miles away from the cave, and she will need the second bijou, but after this
she will reach the castle without any further trouble.
The second case is similar to the first one, but the second time the dragon overtakes the princess when she has reached the castle, and she won't need the second bijou.

#include<stdio.h>
#define eps 1e-6
int main()
{
double p,d,t,f,c;
double dis=0;
int num=0;
scanf("%lf%lf%lf%lf%lf",&p,&d,&t,&f,&c);
if(p>=d||t*p>=c)
printf("0");
else
{
dis+=t*p;
while(c-dis>eps)
{
t=dis/(d-p);
dis+=t*p;
if(c-dis<eps)
{
printf("%d",num);
break;
}
else
num++;
dis+=(t+f)*p;
if(c-dis<eps)
{
printf("%d",num);
break;
}
}
}
return 0;
}


展开全文
• ## escape

2013-11-09 22:40:58
xhtml_escape(value): """Escapes a string so it is valid within HTML or XML.""" ...xhtml_unescape(value): """Un-escapes an XML-escaped string."""json的编码和解码json_encode(value):
xml,html的编码和解码
xhtml_escape(value):    """Escapes a string so it is valid within HTML or XML."""

xhtml_unescape(value):    """Un-escapes an XML-escaped string."""json的编码和解码json_encode(value):    """JSON-encodes the given Python object."""json_decode(value):    """Returns Python objects for the given JSON string."""    return json.loads(to_basestring(value))
空白符改为单个空格squeeze(value):    """Replace all sequences of whitespace chars with a single space."""    return re.sub(r"[\x00-\x20]+", " ", value).strip()
URL编码和解码url_escape(value, plus=True):url_unescape(value, encoding='utf-8', plus=True):parse_qs_bytes(qs, keep_blank_values=False, strict_parsing=False):递归字典或列表，统一其中数据格式recursive_unicode(obj):    """Walks a simple data structure, converting byte strings to unicode.
Supports lists, tuples, and dictionaries.    """    if isinstance(obj, dict):        return dict((recursive_unicode(k), recursive_unicode(v)) for (k, v) in obj.items())    elif isinstance(obj, list):        return list(recursive_unicode(i) for i in obj)    elif isinstance(obj, tuple):        return tuple(recursive_unicode(i) for i in obj)    elif isinstance(obj, bytes_type):        return to_unicode(obj)    else:        return obj将文本中的链接，改成可点击的linkify(text, shorten=False, extra_params="",            require_protocol=False, permitted_protocols=["http", "https"]):    """Converts plain text into HTML with links.

展开全文
• Escape
• 在此，主要通过“%” 和 “_”来对ESCAPE关键字的作用进行说明。 %：匹配任意多个字符。 _：匹配单一字符。 如果我们要匹配“%”或者“_”时，就必须使用“\”进行转义，如下： ### 查询名字中带明字的用户 >...
MySQL转义

转义即表示转义字符原来的语义，一个转义字符的目的是开始一个字符序列，使得转义字符开头的该字符序列具有不同于该字符序列单独出现时的语义。

MySQL中，转义字符以“\”开头，编程中常见的转义字符，在MySQL均是有效的，在此不做赘述和讨论。在此，主要通过“%” 和 “_”来对ESCAPE关键字的作用进行说明。

%：匹配任意多个字符。

_：匹配单一字符。

如果我们要匹配“%”或者“_”时，就必须使用“\”进行转义，如下：

### 查询名字中带明字的用户
> SELECT * FROM user WHERE name LIKE CONCAT("%", "明", "%")

### 查询名字带有%字符的用户
> SELECT * FROM user WHERE name LIKE CONCAT("%", "\%", "%")

ESCAPE的用法

ESCAPE 关键字的主要作用就是指定一个字符替代“\”的作用。

### 查询名字带有“%”字符的用户
> SELECT * FROM user WHERE name LIKE CONCAT("%", "$%", "%") ESCAPE "$"

### 查询名字带有“_”字符的用户
> SELECT * FROM user WHERE name LIKE CONCAT("%", "a_", "%") ESCAPE "a"

需要注意的查询条件中所有通过ESCAPE指代的字符均会替代“\”的作用。

### 假设存在名字为 %a 和 %_ 两个的用户
> SELECT * FROM user WHERE name LIKE "a%_" ESCAPE "a"         ### %a %_
> SELECT * FROM user WHERE name LIKE "a%a" ESCAPE "a"         ### %a
> SELECT * FROM user WHERE name LIKE "a%a_" ESCAPE "a"        ### %_


展开全文
• <div><p>this will also cause the confirmation to fire the callback on escape</p><p>该提问来源于开源项目：visionmedia/uikit</p></div>
• javascript有编码函数escape()和对应的解码函数unescape()，而php中只有个urlencode和urldecode，这个编码和解码函数对encodeURI和encodeURIComponent有效，但是对escape的是无效的。javascript中的escape()函数和...

javascript有编码函数escape()和对应的解码函数unescape()，而php中只有个urlencode和urldecode，这个编码和解码函数对encodeURI和encodeURIComponent有效，但是对escape的是无效的。javascript中的escape()函数和unescape()函数用户字符串编码，类似于PHP中的urlencode()函数，下面是php实现的escape函数代码：

/**
* js escape php 实现
* @param $string the sting want to be escaped * @param$in_encoding
* @param $out_encoding */ function escape($string, $in_encoding = 'UTF-8',$out_encoding = 'UCS-2') {
$return = ''; if (function_exists('mb_get_info')) { for($x = 0; $x < mb_strlen ($string, $in_encoding );$x ++) {
$str = mb_substr ($string, $x, 1,$in_encoding );
if (strlen ( $str ) > 1) { // 多字节字符$return .= '%u' . strtoupper ( bin2hex ( mb_convert_encoding ( $str,$out_encoding, $in_encoding ) ) ); } else {$return .= '%' . strtoupper ( bin2hex ( $str ) ); } } } return$return;
}

对应的解码php unescape代码是：

function unescape($str) {$ret = '';
$len = strlen($str);
for ($i = 0;$i < $len;$i ++)
{
if ($str[$i] == '%' && $str[$i + 1] == 'u')
{
$val = hexdec(substr($str, $i + 2, 4)); if ($val < 0x7f)
$ret .= chr($val);
else
if ($val < 0x800)$ret .= chr(0xc0 | ($val >> 6)) . chr(0x80 | ($val & 0x3f));
else
$ret .= chr(0xe0 | ($val >> 12)) .
chr(0x80 | (($val >> 6) & 0x3f)) . chr(0x80 | ($val & 0x3f));
$i += 5; } else if ($str[$i] == '%') {$ret .= urldecode(substr($str,$i, 3));
$i += 2; } else$ret .= $str[$i];
}
return $ret; } 转载于:https://www.cnblogs.com/thinksasa/p/4212685.html 展开全文 • and a delimiter with an escape character. But CsvParserPlugin doesn't treat the escape character as a special character if an item is not enclosed in quotations. So a string value containing <... • value LIKE :pattern ESCAPE :escape").params(pattern='%z%', escape='\') works as expected in both DBs.</p><p>该提问来源于开源项目：sqlalchemy/sqlalchemy</p></div> • <div><p>adds from six.moves import html_escape</p> ... python2 - cgi.escape python3 - html.escape</p> <p>reference: Issue #159</p><p>该提问来源于开源项目：benjaminp/six</p></div> • 无详细内容 无 SQL中escape的主要用途1.使用 ESCAPE 关键字定义转义符。在模式中，当转义符置于通配符之前时，该通配符就解释为普通字符。例如，要搜索在任意位置包含字符串 5% 的字符串，请使用： WHERE ColumnA ... • 易语言Escape加解密源码,Escape加解密,unescape,escape • EscapeHTML 是一个简单的 Swift 库用来对 HTML 中的特殊字符进行转义。 示例代码： import EscapeHTML escape("<p>some html</p>") 标签：EscapeHTML • Escape加解密.rar Escape加解密.rar Escape加解密.rar Escape加解密.rar Escape加解密.rar Escape加解密.rar • escape_room •$ Unnecessary escape character: - no-useless-escape 禁用不必要的转义字符; \-
• 语言:English Escape DFW的扩展。 Escape DFW的详细联系信息列表。
• escape sequence”实际上是用来生成换码符的关键字的顺序。换码符会告诉打印机将不再打印后面的字符，但是还要将这些字符解释为一类打印机控制码或其他。 “escape sequence”依赖于生成字符的编辑器。例如，在 ...
• The usual stuff, after you beat the boss at the topmost floor of his castle, the evil boss triggers the auto destruct function of his castle, and you must escape! However, not so fast! You have fought...
• 易语言取Escape编码源码,取Escape编码,十到十六,Escape编码,URL编码,ANSI转UNICODE,MultiByteToWideChar
• RegExp.escape, 将 RegExp.escape 添加到ECMAScript标准的建议 RegExp.escape 建议将 RegExp.escape 方法添加到ECMAScript标准的建议。形式规范状态这里建议是一个阶段 0 ( 说明) 提案，正在等待实现和更多输入。 ...
• select * from tablewhere col like '%\_'escape'\' 转载于:https://www.cnblogs.com/kevinkim/p/3554422.html
• /**  * Returns a string that is equivalent to the input string, but with  * special characters converted to HTML escape sequences. ... * @param input the string to escape (null no
• Bio/Restriction/PrintFormat.py:427:12: W605 invalid escape sequence '\w' Bio/Restriction/PrintFormat.py:427:15: W605 invalid escape sequence '\s' Bio/Restriction/PrintFormat.py:427:29:...
• import org.unbescape.html.HtmlEscape; //导入方法依赖的package包/类private Component newItem(String itemId, String itemValue) {String ref;if (itemValue.startsWith(COMMIT_FLAG))ref = itemValue.substring...
• ESCAPE用法1.使用 ESCAPE 关键字定义转义符:　在模式中，当转义符置于通配符之前时，该通配符就解释为普通字符。 2.ESCAPE 'escape_character' 允许在字符串中搜索通配符而不是将其作为通配符使用。escape_...

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