69. 2447 (별 찍기 -10)

let input = require("fs").readFileSync("ex.txt").toString().split(" ");

let n = parseInt(input[0]);

const draw_star = (n) => {
  if (n === 1) {
    let star = [];
    star.push("*");
    return star;
  }

  let stars = draw_star(parseInt(n / 3));
  let result = [];
  let line = "";
  let draw = "";

  for (let first of stars) {
    for (let i = 0; i < 3; i++) {
      draw += first;
    }
    result.push(draw);
    draw = "";
  }

  draw = "";
  for (let second of stars) {
    for (let i = 0; i < parseInt(n / 3); i++) {
      line += " ";
    }
    draw += second + line + second;
    result.push(draw);
    draw = "";
    line = "";
  }

  draw = "";
  for (let third of stars) {
    for (let i = 0; i < 3; i++) {
      draw += third;
    }
    result.push(draw);
    draw = "";
  }
  return result;
};

console.log(draw_star(n).join("\n"));

중간에 draw = "", line = "" 은 그려준걸 지우기 위해 사용한것이다.

 

로직에 대한 자세한 설명

https://smhope.tistory.com/191?category=1058420 

73. 2447 (별 찍기 - 10)