๐งธ ์ฒ์์๋ 1๋ถํฐ ๋ํด์ฃผ๊ณ ๋๋๋ฆฌ๊ธฐ๊น์ง ํ๋ค. ํ์ง๋ง 1๋ถํฐ 19๊น์ง ๋ํ ๊ฐ์ด 190์ด๊ณ 19๋ฅผ 29๋ก ๋ฐ๊ฟ์ฃผ๋ฉด 200์ ๋ง๋ค ์ ์๊ธฐ๋๋ฌธ์ ๊ตณ์ด ๋๋๋ ค์ ๊ตฌํ ํ์๊ฐ ์๋ค.
์ฒซ๋ฒ์งธ ์ฝ๋
const fs = require('fs');
const input = +fs.readFileSync('/dev/stdin').toString().trim();
let sum = 0;
let i = 1;
while (sum < input) {
if (sum + i >= input) {
break;
}
sum += i;
i++;
}
i--;
while (input - sum < i+1) {
sum -= i;
i--;
}
console.log(i+1);
๋๋ฒ์งธ ์ฝ๋
const fs = require('fs');
const input = +fs.readFileSync('/dev/stdin').toString().trim();
let sum = 0;
let i = 1;
while (1) {
if (sum + i > input) {
break;
}
sum += i;
i++;
}
console.log(--i);