const { readInput } = require("./util"); const { lines } = readInput("input"); class Buffer { constructor(size = 25) { this.buffer = []; this.size = size; } push(val) { this.buffer.push(val); if (this.buffer.length > this.size) { this.buffer.shift(); } } isValid(val) { if (this.buffer.length < this.size) { return true; } for (let a = 0; a < this.buffer.length; a++) { const wanted = val - this.buffer[a]; for (let b = a + 1; b < this.buffer.length; b++) { if (this.buffer[b] === wanted) { return true; } } } return false; } } const buffer = new Buffer(25); for (const line of lines) { const val = parseInt(line); console.log(buffer.buffer, val, buffer.isValid(val)); if (!buffer.isValid(val)) { console.log(val); break; } buffer.push(parseInt(line)); }