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08.js
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08.js
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const util = require('./util.js')
const TODAY = 8
async function main() {
const ops = util.getInputFromFile(TODAY)
.split('\n')
.map(el => el.split(' '))
.map(el => [el[0], parseInt(el[1])])
console.log("Part 1: " + part1(ops))
console.log("Part 2: " + part2(ops))
}
function part1(ops) {
let visited = new Set()
let ptr = 0, acc = 0
while (!visited.has(ptr)) {
visited.add(ptr)
switch(ops[ptr][0]) {
case 'acc':
acc += ops[ptr][1]
ptr++
break
case 'jmp':
ptr += ops[ptr][1]
break
default:
ptr++
}
}
return acc
}
function part2(ops) {
let visited = new Set(), possibleFlaws = new Set()
let ptr = 0
while (!visited.has(ptr)) {
visited.add(ptr)
switch(ops[ptr][0]) {
case 'acc':
ptr++
break
case 'jmp':
possibleFlaws.add(ptr)
ptr += ops[ptr][1]
break
default:
possibleFlaws.add(ptr)
ptr++
}
}
for(flaw of Array.from(possibleFlaws)) {
let visited = new Set()
let opsCopy = JSON.parse(JSON.stringify(ops));
let ptr = 0, acc = 0
opsCopy[flaw][0] = opsCopy[flaw][0] === 'nop' ? 'jmp' : 'nop'
while (!visited.has(ptr) && ptr<opsCopy.length) {
visited.add(ptr)
switch(opsCopy[ptr][0]) {
case 'acc':
acc += ops[ptr][1]
ptr++
break
case 'jmp':
ptr += ops[ptr][1]
break
default:
ptr++
}
}
if(ptr === opsCopy.length) {
return acc
}
}
return -1
}
main();