20 lines
664 B
JavaScript
20 lines
664 B
JavaScript
// I didn't expect this to be very efficient but it acually was pretty quick
|
|
|
|
const fs = require('fs');
|
|
const [fields, myTicket, nearbyTickets] = fs.readFileSync('./input.txt', 'utf-8').split('\n\n');
|
|
|
|
// make set of all valid nums
|
|
const valid = fields.match(/\d+-\d+/g).reduce((a, v) => {
|
|
let [start, end] = v.split('-').map(a=>parseInt(a));
|
|
for (let j = start; j <= end; j++) {
|
|
a.add(j);
|
|
}
|
|
return a;
|
|
}, new Set())
|
|
|
|
// get all nums on nearby tickets
|
|
const nums = nearbyTickets.match(/\d+/g).map(v => parseInt(v))
|
|
|
|
// find all the nums that aren't valid, add up the total
|
|
let v = nums.filter(num => !valid.has(num)).reduce((a,b)=>a+b,0);
|
|
console.log(v) |