best book for permutation and combination

The recent work project needs to use the JS permutation combination, so wrote a simple demo. A few days ago on the internet to find a write full array A (n,n) of the code feeling can also, so posted out,The implementation of the arrangement: the main use of the whole arrangement is recursive and array of inserts such as 12 of the full arrangement, first put 1 out of the elementcur, and then get the array of

be a four integers n,r,k,m.we assume that they is all between 1 and 1000.Outputoutput the Maxmium days modulo 1000000007.Sample Input5 2 3 2Sample Output6HintSample input means you can choose 1 and 4,1 and 5,2 and 5 in the same day. And you can make the machines in the same group or the different group. Got 6 schemes.1 and 4 in same group,1 and 4 in different groups.1 and 5 in same group,1 and 5 in different groups.2 and 5 in same group,2 and 5 in different groups. We assume 1 in a group and 4

Combinatorial algorithms The idea of this program is to open an array whose subscript represents 1 to M, and the value of the array element is 1 to indicate its subscript The number represented is selected, and 0 is not selected. First, the first n elements of the array are set to 1, which indicates the number of top N. The "10" combination of the array element values is then scanned from left to right, and the first "10"

Using System;Using System.Collections.Generic;namespace algorithms{public class Permutationandcombination{Swap two variablespublic static void Swap (Ref t A, ref T B){T temp = A;A = b;b = temp;}Recursive algorithm for array combination (Private member)private static void Getcombination (ref list{for (int i = n; i >= m; i--){B[m-1] = i-1;if (M > 1){Getcombination (ref list, T, I-1, m-1, B, M);}Else{if (list = = null){List = new list}t[] temp = new T[m]

# Include # Include Int check (char * STR, int L){For (INT I = 0; I {For (Int J = 0; j {If (j = I)Continue;If (STR [I] = STR [J])Return 1;}}Return 0;}Void show (int n, int M, char * STR, char * P, double * I){N --;For (int A = 0; A {P [N] = STR [a];If (n = 0 ){If (! Check (p, strlen (p ))){(* I) ++;Printf ("% s", P );}}If (n> 0) show (n, m, STR, P, I );}}/* Test */Int main (void){Char set [] = "0123456789"; // The Element Set password can be 0-9Int M = strlen (SET); // The set has 6 characters i

found to be a "01" combination, and all "1" to the left of it is moved to the leftmost end of the array. The last combination is obtained when the first "1" moves to the m-n position of the array, where n "1" is all moved to the far right end. For example, choose 5 of the 3 combination: 1 1 1 0 0//1,2,31 1 0 1 0//1,2,41 0 1 1 0//1,3,40 1 1 1 0//2,3,41 1 0 0

be a four integers n,r,k,m.we assume that they is all between 1 and 1000.Outputoutput the Maxmium days modulo 1000000007.Sample Input5 2 3 2Sample Output6HintSample input means you can choose 1 and 4,1 and 5,2 and 5 in the same day. And you can make the machines in the same group or the different group. Got 6 schemes.1 and 4 in same group,1 and 4 in different groups.1 and 5 in same group,1 and 5 in different groups.2 and 5 in same group,2 and 5 in different groups. We assume 1 in a group and 4

That is true Randomly extract 3 numbers from the 36 characters of 0~9,a~z to calculate how many permutation combinations are available Ask the Great God for advice Reply to discussion (solution) 36*36*36=46656 36*36*36 Forget it, I wrote it. /** * Permutation combination algorithm * C ($n, $m) * Number of $n elements * $m number of elements taken from $n

First, using the binary state method to find the permutation combination, this method is easy to understand, but the operation efficiency is not high, small data permutation combination can be used Copy Code code as follows: import java.util.Arrays; Using binary algorithm to arrange allcount1:170187count2:291656

This paper mainly introduces the simple permutation combination algorithm of PHP implementation, combined with specific application examples to analyze the implementation and use of the permutation algorithm, the need for friends can refer to, hope to help everyone. First, the question: Give you a 40 catty of watermelon, to 3 people, how many kinds of sub-method

This article mainly introduces the simple permutation combination algorithm of PHP implementation, combined with specific application examples to analyze the implementation of the permutation algorithm and the use of skills, the need for friends can refer to the following : First, the question: Give you a 40 catty of watermelon, to 3 people, how many kinds o

Title Link: http://acm.hdu.edu.cn/showproblem.php?pid=4497Test instructions: Known gcd (x, y, z) = G,LCM (x, y, z) = L. Tell you G, L, how many groups are required (x, Y, z) to satisfy the requirements, and consider the order.Idea: if l%g! = 0 Obviously does not exist such (x, Y, z), the opposite certainly exists. The specific method is to l/g decomposition of the mass factor, get: l/g = p1^t1 * p2^t2 * ... * pk^tk, we consider any one factor pi^ti, at this time (x/g, y/g, z/g) = (x0, y0,z0) wil

Or permutation algorithm, the string is no big difference. Sort and pay attention to how to remove duplicates. import java.util.ArrayList;import java.util.Arrays;public class Solution { public static ArrayList 9.5 determine all the permutation and combination of a string.