hackathon prizes

1000 Concurrent 3 Prizes guaranteed to stabilize in seconds, and the number of winners and prizes do not go wrong How to deal with this problem, MySQL hope that you have experienced students to share the next experience and solutions, thank you, earlier and so on Reply content: 1000 Concurrent 3 Prizes guaranteed to stabilize in seconds, and the number of wi

Article Description: brand to do interactive activities: Users need what kind of prizes. Do not know when to start to find, online brand-name activities, have to Apple products for the incentive, ipad, iphone, itouch, ipod and so on, and so on, what forward and comments, what write blog, what write comments, users as long as the specified time under the conditions of the completion of the task, It is possible to get these

Ask the php high-concurrency lottery program, how to avoid repeated wins and multiple people draw the same prize? My practice is as follows: First Prize: One prize, second prize: two, third grade: Three. in this way, the prize is 6. if 100 people participate in the lucky draw at the same time, then the empty Prize is 100-6 = 94. First, query the database mysql for a unique number with 6 awards as the prize number: sql1: $ SQL = "ask for the php high concurrency lottery program, how can we avoid

N boxes m people choose to take the prize box in turn and then put it back to get the expected Prize You can calculate the expectation of a prize not selected. Minus n is the answer. # Include Sgu 495. Kids and prizes expectations

(It's hard to pass a picture) This is a post from someone else but I really want to know the answer to these questions (the more clearly the better) so I myself in the replacement, I hope you big fairy support, thank you All the fairies, let's get the avatar. Reply to discussion (solution) How come there's no one back for this big force? If you copy the question, someone might respond. If you copy the question, someone might respond. Unless they can't see the picture? I don't even

Test instructionsThere are n boxes with gifts, and m individuals take them in turn. If there is a gift in the box, take the gift. Whether or not to get a gift, the box is put back in the original. (so it's possible that the people behind them get the boxes from the people in front of them, and then they don't get the prizes). Ask, and finally can take away the number of gifts expected.Two kinds of ideas, to kneel,,, or did not think out ....M-Individu

SGU 495 Kids and Prizes probability dp, sguprizes Question: There are N boxes with gifts, and M people take them one by one. If the box has a gift, take it away. Whether you get the present or not, put the box back. (So it is possible that the people behind the prize will not receive the boxes that the people in front of them have taken ). Q: What is the expectation of the number of gifts that can be taken away. Two ways of thinking: Kneel down, and s

I believe most of the girls are like to buy and buy, I have not seen the girls do not like to buy things, of course, many things also have a lucky draw this offer, a lot of small programs have lottery this function, good nonsense not to say, in order to give a girlfriend to write this lottery program, can be described as painstaking! But to see her happy is more important than anything, although I have no money, but I will try my best to give her I can give! Hahaha, general programmers are singl

　Participation Mode: 1, the daily use of QQ browser open this page can receive 10 points, the first time every week to share the activity page to get 10 points in the QQ space. 2, the daily access to the privileged center of the 10 points can be obtained, the center of the integration of the points with this page exchange. 3, in the privileged center, the game page will randomly appear bonus bonus, after receiving can come to this page or privileged center welfare area to use. 　　Lottery meth

can be repeated, and then can earn a lot of wealth such as (usual) 7, the answer is agreed, an answer is agreed, but also to the corresponding wealth value 8, Baidu know activities such as: Egg award, Lottery eggs can also obtain wealth value, every day has the opportunity to win the eggs, there are 2 points wealth value, there are 5 points wealth value. 　　Lottery rules: 1, each lottery draws consumes 50 wealth value, every day does not limit draws the number of times. 2, the final lottery

SGU495 Kids and Prizes probability DP, expected Formula Question After this question is first entered, there is no place to submit it. The first SGU question can only be submitted on HUSTOJ. There are n boxes in which there are gifts. m people, each person takes them. After they take the gift, they take it out and put it back, hoping to select the number of gifts. In fact, at the beginning, we assume that the equation dp [I] is the probability that I