[백준 11050] 이항 계수 1

문제

https://www.acmicpc.net/problem/11050

11050번: 이항 계수 1

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내가 작성한 코드

import java.io.*;
import java.util.StringTokenizer;

public class qor11050 {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

        StringTokenizer st = new StringTokenizer(br.readLine());
        int N = Integer.parseInt(st.nextToken());
        int K = Integer.parseInt(st.nextToken());

        int Nfac = 1;
        int Kfac = 1;
        int NKfac = 1;

        if(N!=0){
            for(int i = 1; i<=N; i++){
                Nfac *= i;
            }
        }

        if(K!=0){
            for(int i = 1; i<=K; i++){
                Kfac *= i;
            }
        }

        if(N!=K){
            for(int i = 1; i<=N-K; i++){
                NKfac *= i;
            }
        }

        bw.write(Nfac/(Kfac*NKfac)+"");
        bw.close();
    }
}