


Variable a = 8 and array b = array(1,3,5,7,8.9,9,11.3);
Assume that the length of the array is unknown, the variable value is unknown, and the array key values are arranged from small to large
How to quickly find the size of quantity a between the key name and the key name in array b
eg: a=8, between b[4] and b[5]
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Variable a = 8 and array b = array(1,3,5,7,8.9,9,11.3);
Assume that the length of the array is unknown, the variable value is unknown, and the array key values are arranged from small to large
How to quickly find the size of quantity a between the key name and the key name in array b
eg: a=8, between b[4] and b[5]
The length is unknown...it's unlikely...isn't it just b.length?...
Is there any better way to query this kind of query besides binary division...
Or you can encapsulate a class yourself, do a mapping when the array is created, and group the data according to size. How to group depends on your requirements, which can greatly improve the speed.
For example, to be simpler, group by integers, like this:
<code>class ClassA extends Array { constructor(...args) { super(...args); this.hash = []; for(let i = 0; i </code>The
array is still the same array, just add a hash, which represents the starting subscript of the integer segment. For example, if you want to query the number 8.5, then you only need to query this.hash[Math.floor(8.5)]
and this.hash[Math.floor(8.5) 1]
, two subscripts The data between the two hashes is enough. If the two hashes are empty, then just search forward and backward until the value is found. If the data is too sparse, you can make another hash for this hash and record the valid integer segments. Anyway, it is just space for time.
Obviously using binary search
Implementation method:
<code>1、先排序(冒泡、快速排序等,本题已优先排列好) 2、插入需要判断的元素,再排序 3、返回插入数组所在的键值</code>

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

在PHP中,可以利用implode()函数的第一个参数来设置没有分隔符,该函数的第一个参数用于规定数组元素之间放置的内容,默认是空字符串,也可将第一个参数设置为空,语法为“implode(数组)”或者“implode("",数组)”。


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