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