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BOJ_16395.java
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BOJ_16395.java
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import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.StringTokenizer;
public class Main {
private static final int LIMIT = 30;
private int[][] getPascalTriangle() {
int[][] arr = new int[LIMIT+1][];
for (int i = 1; i <= LIMIT; i++) {
arr[i] = new int[i+1];
}
arr[1][1] = 1;
for (int i = 1; i < LIMIT; i++) {
for (int j = 1; j <= i; j++) {
arr[i+1][j] += arr[i][j];
arr[i+1][j+1] += arr[i][j];
}
}
return arr;
}
private void solution() throws Exception {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
int[][] arr = getPascalTriangle();
StringTokenizer st = new StringTokenizer(br.readLine());
int n = Integer.parseInt(st.nextToken());
int k = Integer.parseInt(st.nextToken());
System.out.println(arr[n][k]);
}
public static void main(String[] args) throws Exception {
new Main().solution();
}
}