Node.js) 백준 11050번 : 이항계수 1

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

11050번: 이항 계수 1

https://velog.io/@shanghai1109/%EB%B0%B1%EC%A4%80-11050%EB%B2%88

백준 11050번 파이썬

const fs = require('fs');
const [N, K] = fs.readFileSync("./dev/stdin").toString().trim().split(" ").map(v => +v);

let n = 1;
let r = 1;
let n_r = 1;

for (let i = 1; i <= N; i++) {
  n *= i;
}

for (let i = 1; i <= K; i++) {
  r *= i
}

for (let i = 1; i <= N - K; i++) {
  n_r *= i
}

console.log(n / (r * n_r));

 

 

const fs = require('fs');
const [N, K] = fs.readFileSync("./dev/stdin").toString().trim().split(" ").map(v => +v);

let n = 1;
let r = 1;
let n_r = 1;

for (let i = N-K+1; i <= N; i++) {
  n *= i;
}

for (let i = 1; i <= K; i++) {
  r *= i
}


console.log(n / r);