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HDU 4870 Rating Gaussian elimination method, hdu4870 Link: http://acm.hdu.edu.cn/showproblem.php? Pid = 1, 4870 Assume that you use two accounts to participate in a competition. In the initial state, both accounts have zero points. Each game uses a low-score account to compete. A probability of winning a game is P, the score of the corresponding account increases by 50 points. Otherwise, the score of the co

HDU 4870 Rating (Gaussian deyuan), hdu4870HDU 4870 Rating Question Link A person registers two accounts, and the initial rating is 0. He plays the game with the low score each time. After winning the game, he adds 50 points and deducts 100 points. The winning rate is p, he will hit the game until he scored 1000 points on the first day and asked about the expectations of the game. Train of Thought: f (I, j)

Http://acm.hdu.edu.cn/showproblem.php? PID = 1, 4870 Question: There are two numbers, and the initial score is 0. Each time you choose a game with a small score, if you choose one with the same score, the probability of a P score increases by 50 points, and the maximum score is 1000 points, A probability of 1-P drops by 100,The minimum value is 0.. I would like to ask you the expected number of times you want to play the game when the number reaches

number p (0.3 OutputYou should output a float number for each test case, indicating the expected count of contest she needs to participate in. This problem is special judged. The relative error less than 1e-5 would be accepted.Sample Input1.000000 0.814700Sample Output39.000000 82.1811601#include 2#include string.h>3#include 4 using namespacestd;5 6 intMain ()7 {8 inti,j;9 Doubledp[ A],p,ans[ -][ -];Ten while(SCANF ("%LF", p)! =EOF) One { Adp[0]=1.0/p; -dp[1]=1.0/p/p; -ans[0][0

In fact, zoj 3415 should be called Yu Zhou... After encountering zoj 3415, I used the second method of Reference URL to seek the communication item, and this time I met 4870, I won't do it. After referring to chanme, I re-deduced zhou Yu and the ranking repeatedly (not to push down) four or five times to write this question about plagiarism... These two questions are very similar. Multi-school rating is equivalent to a forced version, but the principl

HDU 4870 Rating (Gaussian deyuan)HDU 4870 Rating Question Link A person registers two accounts, and the initial rating is 0. He plays the game with the low score each time. After winning the game, he adds 50 points and deducts 100 points. The winning rate is p, he will hit the game until he scored 1000 points on the first day and asked about the expectations of the game. Train of Thought: f (I, j) indicates

, probability is P, expectation is 1*p2. Failure. Probability 1-p. Expected for (1-p) * (1+dp[0])-----so dp[0]=1*p+ (1-p) * (1+dp[0]), dp[0]=1/p after simplification;DP[1] Represents the number of fields we expect from 50-100, divided into two cases: 1. Success, probability is P, expectation is 1*p2. Failure, probability 1-p, expectation (1-p) * (1+dp[0]+dp[1])-----so dp[1]=1*p+ (1-p) * (1+dp[0]+dp[1]), dp[1]=1+ (1-p)/p* (1+dp[0]) after simplification;I>2,dp[i] is divided into two cases: 1. Succ

Links: http://acm.hdu.edu.cn/showproblem.php?pid=4870Test instructions: With two accounts to participate in a game, the initial state of two accounts are 0 points, each game with a low score of the account to play. have p probability to win, the corresponding account score up 50 points, or the corresponding account score down 100 points, ask when there is an account score of 1000 time to participate in the number of mathematical expectations of the game.Idea: During the game thought is a formula

Link: http://acm.hdu.edu.cn/showproblem.php? PID = 1, 4870 Assume that you use two accounts to participate in a competition. In the initial state, both accounts have zero points. Each game uses a low-score account to compete. A probability of winning a game is P, the score of the corresponding account increases by 50 points. Otherwise, the score of the corresponding account decreases by 100 points. Ask the expected number of times of participation in

[HDU 4870] Rating [DP], hdu4870rating A person registers two accounts, and the initial rating is 0. He plays the game with the low score each time. After winning the game, he adds 50 points and deducts 100 points. The winning rate is p, he will hit the game until he scored 1000 points on the first day and asked about the expectations of the game. Question: because each time we increase or decrease the score is a multiple of 50, we can compress it into

In cocos2d-x 2. x, the iphone device's Retina hd mode is no longer the original-hd suffix after the hd image.2. after the hd mode is enabled before x, the underlying layer will automatically add-hd to the image name when the addImage is enabled. The-

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