P1036 [NOIP 2002 Junior] Choosing Numbers
Description
Given $n$ integers $x_1, x_2, \cdots, x_n$, and one integer $k$ ($k
Input Format
The first line contains two integers $n, k$ separated by a space ($1 \le n \le 20$, $k
Output Format
Output a single integer representing the number of ways.
Explanation/Hint
【Source】
NOIP 2002 Junior, Problem 2.
Translated by ChatGPT 5