lottery algorithm generator

This paper mainly introduces PHP programming to achieve the calculation of lottery probability algorithm, combined with a complete example of the PHP random number operation related operation skills, the need for friends can refer to, hope to help everyone. Operation Result: Ipad

Set up a winning list Field description idPrize number prizePrize name vProbability of winning$prize_arr = array(array(‘id‘ => 1, ‘prize‘ => ‘笔记本电脑‘, ‘v‘ => 1),array(‘id‘ => 2, ‘prize‘ => ‘华为手机‘, ‘v‘ => 5),array(‘id‘ => 3, ‘prize‘ => ‘蓝牙音箱‘, ‘v‘ => 10),array(‘id‘ => 4, ‘prize‘ => ‘1000积分‘, ‘v‘ => 12),array(‘id‘ => 5, ‘prize‘ => ‘30积分‘, ‘v‘ => 22),array(‘id‘ => 6, ‘prize‘ => ‘下次没准就能中哦‘, ‘v‘ => 50),); Package winning probability functionfunction get_rand($proArr){ $resul

Php prize winning probability algorithm, which can be used for scratch cards, big turntable, and other lottery algorithms $ ProCur) {$ randNum = mt_rand (1, $ proSum); if ($ randNum

The php winning probability algorithm can be used to draw lottery algorithms such as scratch cards and big turntable. The usage is very simple. The Code has a detailed description, which can be understood at a glance.

PHP winning probability algorithm, can be used for scraping cards, large turntable, such as lottery algorithm. The usage is very simple, the code has the detailed annotation explanation, at a glance can understand $proCur) { $randNum = Mt_rand (1, $proSum); if ($randNum $result = $key; Break } else { $proSum-= $proCur; } } Unset ($PROARR); return $res

Weighted random in the game development of heavy use, a variety of sweepstakes and explosive equipment.Operations to configure the probability of each item appearing as needed.That's what we're going to say today. The idea of the weighted stochastic algorithm is very simple, that is, " all the items according to their weights constitute a range, the weight of large interval large." You can imagine a pie chart. Then, throw the dice and see what interva

', ' Weight ' =>80)Weights are ranked in turn, and the weights are guaranteed to be integer);function Lotterydraw ($arr) {$weightSum = 0;foreach ($arr as $rows) {$weightSum + = $rows [' Weight '];//total weight added}$randomNumber = rand (1, $weightSum);//Get random numbersforeach ($arr as $rows) {if ($randomNumber return $rows [' Prize '];}else{$randomNumber-= $rows [' Weight '];}}}The more experiments you get, the closer the weight$first = $second = $third = 0;//number of times 0for ($i = 0;

Not much to say, the code is not many, the algorithm is simpleMethod One:/** * Algorithm for winning numbers, the method will fill the last number to this position after each draw to a winning number, implementing the non-repeating extraction. * Method Two:/** * Gets the algorithm of the winning number, method sets the value of the original array to be Boolean, t

We finish the process of PHP backstage, PHP's main work is responsible for the allocation of prizes and the corresponding probability of winning, the current page click to flip a box will want the background PHP to send Ajax request, then the backstage PHP according to the probability of configuration, through the probability algorithm to give the winning results, The award information is also sent to the front-end page in JSON data format. First loo

In the previous blog, we learned about the real random number generator based on physical phenomena, however, the real random number generation is slow, for the actual computation needs, the random number in the computer is generated by the program algorithm, that is, some formula function, but for the same random seed and function, the resulting random sequence is certain, Therefore, the resulting random n

RandomThe random class in Java generates a pseudo-random number, uses the seed of 48-bit, and then calls a linear congruential formula linear congruence equation (Donald Knuth's programming Art of 3.2.1)If two random instances use the same seed, and the same function is called, then the generated sequence is the sameYou can also call Math.random () to generate a random numberThe random instance is thread-safe , but concurrent use of the random instance can affect efficiency, and you might consid

Efficient STL-iterator algorithm, STL-generator Efficient STL-iterator Algorithm Each standard STL container provides four types of iterators: iterator, const_iterator, reverse_iterator, and const_reverse_iterator. At the same time, some forms of insert and erase of the container only accept one of them. There is no way to convert from the const iterator to a n

This is a creation in Article, where the information may have evolved or changed. Gosnowflake Distributed thread-safe UID generator implemented according to Twitter Snowflake algorithm Feature Thread-Safe UID generator Green pluggable, no reliance on redis,mysql, no status Suitable for distributed systems Implementing the Twitter Snowflake theory

The snowflake algorithm is particularly efficient when generating IDs, for reference to: 1190000011282426The result of the snowflake algorithm generation ID is an integer of 64bit size, which is structured as: 1位No. The highest 1 of the binary is negative, but the IDs we generate are usually integers, so this is 0. 41位, which is used to record the timestamp (in milliseconds). 41-bit can repre

Hand shake algorithm, hand shake Generator How can we put the string upside down? We use the two pointers at the beginning and end of the string to scan the two sides in the middle, and constantly exchange the content of the two pointers, void reverse(int a[], int n){ if(n Then, if you want to reverse the string, for example, if you want to replace the first n characters with the rest of the string, for

)):returnFalsereturnTruedefCalqueen (LST, n):" "solving the nth queen with the previous Queen does not interfere with the submission of data only on the eighth level, each of the remaining layers is the addition of all possible and subsequent additions to this layer" " forIinchRange (8): Calqueen.total+ = 1ifRightqueen (LST, i): Calqueen.count+ = 1ifn = = 7: Calqueen.number+ = 1Print(Calqueen.number, Calqueen.count, Calqueen.total)yieldLST +[i]Else: forLinchCalqueen (LST + [

nextdef outer (func):def inner ():Print ("before")R = func () # executes the original function and gets the original function return valuePrint ("after")Return R # Returns the return value of the original functionreturn innerIf the original function defines a parameterThe function of the adorner should use the universal parameters to solve the problem of the original function with parameters.def outer (func):def inner (*args,**kwargs):Print ("before")R = Func (*args,**kwargs) # Here Python will