[백준] 11050 이항계수 1 - GoLang

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

11050번: 이항 계수 1

 

 

package main

import (
	"bufio"
	"fmt"
	"os"
)

func factorial(t int) int {
	ans := 1
	for i := t; i > 0; i-- {
		ans *= i
	}

	return ans
}

func main() {
	reader := bufio.NewReader(os.Stdin)
	writer := bufio.NewWriter(os.Stdout)
	defer writer.Flush()

	var n, k int
	fmt.Fscanln(reader, &n, &k)

	res := factorial(n) / (factorial(k) * factorial(n - k))
	fmt.Fprintf(writer, "%d", res)
}