--- 获取utf8编码字符串正确长度的方法
-- @param str
-- @return number
function utfstrlen(str)
local len = #str;
local left = len;
local cnt = 0;
local arr={0,0xc0,0xe0,0xf0,0xf8,0xfc
一)
Returns an iterator pointing to the element with the largest value in the range[first,last)
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position=max_element(a,a+n)-a;
这样写的话就代表的是