Node.js) 백준 29736번: 브실이와 친구가 되고 싶어 🤸‍♀️

https://www.acmicpc.net/problem/29736

29736번: 브실이와 친구가 되고 싶어 🤸‍♀️

const [[A, B], [K, X]] = require('fs')
	.readFileSync('./dev/stdin')
	.toString()
	.trim()
	.split('\n')
	.map((v) => v.split(' ').map(Number));

let left = K - X > A ? K - X : A;
let right = K + X < B ? K + X : B;
const answer = right - left + 1;
if (answer == 0 || K - X > B || K + X < A) console.log('IMPOSSIBLE');
else console.log(answer);