[JS] 백준 8393번 / 합 / 조건문

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문제

8393번: 합

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정답

let fs = require("fs");
let filePath = process.platform === "linux" ? "/dev/stdin" : "test.txt";

let input = Number(fs.readFileSync(filePath).toString());
let answer = Array(input)
  .fill(1)
  .map((a, b) => a + b)
  .reduce((a, b) => a + b);

console.log(answer);

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