#include <stdio.h>int fun( int n, int minNum, int maxNum ){ int tot, i; if ( n == 0 ) return(1); tot = 0; for ( i = minNum; i <= maxNum; i++ ) tot += fun( n - 1, i + 1, maxNum ); return(tot);} int main(){ int n, m; scanf( "%d%d ", &n, &m ); printf( "%d\n", fun( m, 1, n ) ); return(0);}输入： 6 3 输出：________