足球赛售票

 

递归

 

#include <iostream>
using namespace std;
int f(int a,int b)
{
if(a<b) return 0;
else if(b==0) return 1;
else if(b<=a) return f(a-1,b)+f(a,b-1) ;
}

 

int main(int argc, char *argv[])
{

int m,n;
while(cin>>m>>n)
 cout<<f(m,n)<<endl;
 return 0;
}

 

 

 

 

 

#include <iostream> using namespace std;

int f(int a,int b)

{      if(b==0) return 1 ;

         if(a<b)   return 0 ;

             else      return f(a-1,b)+f(a,b-1) ;

}

int main(int argc, char *argv[])

{

int m,n;

while(cin>>m>>n)

 cout<<f(m,n)<<endl;

 return 0;

}

转载于:https://www.cnblogs.com/2014acm/p/3917560.html