HDU-2199 Binary Search Equation

Question connection Analysis: The left side of the equation is obviously monotonically increasing in the [0,100] range, which adapts to the binary search. Directly water it. # Include # include # define EPS 1e-10 int sign (Double X) {return x

Hdu1013-simple number theory

Question: It is to add each digit of a number to see if it is smaller than 10. It is output, otherwise it will continue. Analysis: This question is not difficult. We made it to let us know a conclusion. Root k = (n-1) % 9-1 of a number (N; I

The poj-2478 calculates the total number of the first n Euler's function values (Template ).

Question connection Analysis: This question is only raised in another form. In reality, we can regard the score as a pair of mutual quality numbers. Then we need to calculate the number of first N, the total number of Euler's function values for

DFS-deformation course

This question is similar to the idiom solitaire. I understand the meaning of the question. The method is very simple, that is, to search for the letter starting with "B" and determine whether the last letter is 'M'. If it is found, I will return it,

Perfect solution to recursive Equations

Question connection Analysis: The question requires that we give an integer N, which must be in the range of 13 ~ An odd number between N. It can represent the sum of two composite numbers. For an odd number, there may be multiple solutions. G

Poj1942-combined mathematics

Question connection The meaning of the question is very clear, that is, how small is the walk (only up, to the right) from the diagonal line to the other ). Analysis: a matrix with rows and columns. To reach the diagonal line, there must be all

HDU-1251, Dictionary tree

A typical dictionary tree problem. The number of prefixes in the dictionary tree is not used. The dictionary tree is very simple. It has three basic operations: creating a dictionary tree, inserting, and querying. If you know how to build and use

Thoroughly understand KMP-character matching

This algorithm is very skillful. This is mainly about next []. Its value has a relationship with the matching string, but it has nothing to do with the main string. It represents a substring (a matched string). When the I of the primary string does

Codeforces round #177 div2

This is really a magic game. There are various kinds of guesses in the game, but I cannot prove it. I am speechless. If I want to be able to do this in the official game, then I am not invincible? Don't talk nonsense. Just answer the

Experiences of an acmer

  I plan to mention it a little later. The latter: What is effective training? I want to explain my understanding.Many acmer beginners have been told that they want to do more questions. If they do more than 500 questions, they will be changed. In

HDU 4612 warm up

Http://acm.hdu.edu.cn/showproblem.php? PID = 1, 4612  Warm up Time Limit: 10000/5000 MS (Java/others) memory limit: 65535/65535 K (Java/Others)Total submission (s): 2012 accepted submission (s): 474Problem description  N planets are connected by M

Array of HDU-1166 enemy troops (tree array and line tree)

This topic is the update and segmentation summation of a group of data. Because the data is too large, we will think of using a tree array. Of course, you must first understand it. This is a typical application. Tree array (256 ms) operation:

Climbing ladder-recursive equation (similar to integer decomposition)

Question connection Question Analysis: This is a general question. It seems that there are many possibilities for dividing the number. In fact, it is the same as taking steps. If one of the two steps can be crossed at most, it will take n steps,

Codeoforces 271 D (suffix automatic machine Sam)

Http://codeforces.com/problemset/problem/271/D Question: Give You A string "S" and define whether each character is "good" or "bad". Calculate the number of different strings in "S" that contain no more than K bad characters.   Idea: hash and set

Game? Question? You can't say it...

Question connection Analysis; This question is indeed a pitfall, and the water question is completely unknown. What kind of recurrence and game are there ?, This is just a big question. This is suitable for primary school students, because they

Poj-1258 agri-Net

This type of question is a water question. A very direct prim algorithm. No need to explain more. # Include # include const int max = 0 xffffff; int main () {int I, j, N, K; int A [100] [100], W [100]; while (~ Scanf ("% d", & N) {memset (A,

Poj3041-maximum matching of bipartite graphs

Link Binary Graph Analysis Question: The connection is ready. Rows and columns are regarded as two sets, and bullets are regarded as edges. This is a typical template question. The Code is as follows: # Include # include bool used [505]; int

Poj-1469, 1274 bipartite graph Hungary Algorithm

Question connection Students have their own favorite courses. Therefore, for a course, multiple students may like it, but we want to have candidates for none of them. The first data indicates the number of tests, followed by P courses and N students,

Poj2635-big hexadecimal conversion + same theorem + prime number screening

Question connection I do not know how many times this question is. First, the time-out for listing the prime number table and then the time-out for obtaining the remainder number. No way. I saw Daniel in despair. I was speechless ..... Question:

Poj1287-Kruskal and prim algorithm.

After learning these two algorithms, I still don't fully understand the differences between the two methods. I personally like to use the Kruskal algorithm because it does not have to be initialized like the prim algorithm, the for statement is also

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