Put the ball in the box

Put the ball in the box

Problem description:

KPut the same ballsNDifferent boxes. Your task is to calculate the number of different release methods.

Input:

The input file contains several rows. Each row has two positive integers.NAndKIs a set of test data ,(N Bytes 1 ,K Bytes 0 ).

Input until the end of the file.

Output:

For each group of test data in the input file, output in the output fileKPut ballsNNumber of different box placement methods.

Input example:

3 4

1 4

 

Output example

15

1

 

 

#include 
  
   #include 
   
     using namespace STD; int COM (int n, int R) {int I, j, S = 1; if (n-r 
    
      N> K) {printf ("% d \ n", COM (n + k-1, k);} return 0 ;}