30 lines
640 B
JavaScript
30 lines
640 B
JavaScript
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const fs = require('fs');
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const data = fs.readFileSync('input.txt', 'utf-8');
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const rules = data.split('\n');
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let bagRules = {}
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rules.forEach(rule => {
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halves = rule.split(' bags contain ')
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bagRules[halves[0]] =
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halves[1].replace(/( bags| bag|\.)/g, "")
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.split(", ")
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.map((t)=>{
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return {
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name: t.replace(/\d /,""),
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amt: t[0]
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}
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})
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});
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function howManyIn(name) {
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let amt = 1
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bagRules[name].forEach(rule => {
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if (rule.amt == 'n') {return}
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amt += parseInt(rule.amt) * howManyIn(rule.name)
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})
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return amt
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}
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howManyIn('shiny gold')-1 // subtract the first gold bag
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