44 lines
1 KiB
JavaScript
44 lines
1 KiB
JavaScript
const fs = require('fs');
|
|
|
|
let input = fs.readFileSync('input.txt', 'utf-8').split('\n').sort((a, b) => val(a).getTime() - val(b).getTime());
|
|
|
|
function val(a) {
|
|
let time = new Date(a.match(/\[(.*)\]/)[1]);
|
|
return time;
|
|
}
|
|
|
|
let guards = {};
|
|
let id;
|
|
let start;
|
|
let shifts = []
|
|
for (let line of input) {
|
|
let match = line.match(/#(\d+)/);
|
|
if (match) {
|
|
id = match[1];
|
|
if (!guards[id])
|
|
guards[id] = {};
|
|
shifts.push(id);
|
|
} else {
|
|
if (line.includes('falls')) {
|
|
start = val(line).getMinutes();
|
|
} else if (line.includes('wakes')) {
|
|
let end = val(line).getMinutes();
|
|
for (time = start; time < end; time++) {
|
|
guards[id][time] = (guards[id][time] || 0) + 1;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
function sleps(guard) {
|
|
try {
|
|
return Object.values(guard[1]).reduce((a, b) => a + b) / shifts.filter(v => v == guard[0]).length;
|
|
} catch (err) {
|
|
return 0;
|
|
}
|
|
}
|
|
id = Object.entries(guards).sort((a, b) => sleps(b) - sleps(a))[0][0];
|
|
let minute = Number(Object.entries(guards[id]).sort((a, b) => b[1] - a[1])[0][0]);
|
|
|
|
console.log(`#${id} * minute ${minute} = ${id * minute}`)
|