学步园

/*
 * POJ_1306.cpp
 *
 *  Created on: 2013年10月8日
 *      Author: Administrator
 */

#include <iostream>
#include <cstdio>

using namespace std;

unsigned int c[110][110];

void work(){
	int i,j;
	for(i = 0 ; i < 102 ; ++i){
		c[i][0] = 1;
	}

	for(i = 1 ; i < 102 ; i++){
		for(j = 1 ; j < 102 ; ++j){
			c[i][j] = c[i-1][j-1] + c[i-1][j];
		}
	}
}

int main(){
	work();

	int n,m;
	while(scanf("%d%d",&n,&m)!=EOF,n){
		printf("%d things taken %d at a time is %d exactly.\n",n,m,c[n][m]);
	}
}