A lamb can live to be 5 years old. It gives birth to a lamb at the age of 2 and 4, and dies at the age of 5.
Q: now there is a newborn lamb (how many sheep will there be after the age of 0), n?
A lamb can live to be 5 years old. It gives birth to a lamb at the age of 2 and 4, and dies at the age of 5.
Q: now there is a newborn lamb (how many sheep will there be after the age of 0), n?
the first type:
function fn($x){
$arr=[0=>0,1=>1,2=>2,3=>2,4=>4];
if($x<=4)return $arr[$x];
return fn($x-2)+fn($x-4);
}
echo fn(10);recently, we are going to do a statistics on the activity of the industry in the project, and the three factors that affect the activity of the industry are the number of posts issued by the industry, the number of comments on the information of the indu...
there is a CAPTCHA data table with 2 million pieces of data. CAPTCHA fields need to be unique you need to insert a large amount of data into this table, about tens of thousands of pieces of data at a time how to optimize the execution time of each ...
for example, there are two arrays, one number for each group, and a new array according to size,. if size is 2, then the result is [1pje 1], [1p3], [1p4], [2pr 1], [2pr 3], [2pr 4], [3pr 1], [4pr 1], [2pr 1], [3jue 2], [4jue 2]]; if size is 3, the resu...
everyone can see their own ranking, and it is updated in real time. If the number of users is small, you can use the ordered collection of redis. If the number of users is large, this solution will not work. ...
topic description encryption key 2fs5uhnjcnpxcpg9 plaintext 3280VAND 99br 20120201123050 ciphertext daa745f1901364c0bd42b9658db3db96336758cd34b2a57 sources of topics and their own ideas related codes Please paste the code text below (...
how can you use php to cycle out 120 possibilities if you group the numbers of one, two, three, three, four, five, five, six? for example: 123 124 125 126 132 134 135 136 142 143 145 146 152153154156 162.163.164.165 2132142...