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6.js
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6.js
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// Total duration: 6 min (rounded to the nearest minute)
// Started at: 18:33
// First star at: 18:36
// Second star at: 18:39
const solveProblem = (data) => {
// Parse data
const lines = data.split("\n").slice(0, -1);
// Part 1
for (const line of lines) {
for (let i = 0; i < line.length; i++) {
const [a, b, c, d] = [line[i], line[i+1], line[i+2], line[i+3]]
if (a == b || a == c || a == d || b == c || b == d || c == d) {
continue
}
console.log(i + 4);
break
}
}
console.log("\n")
// Part 2
const amount = 14;
for (const line of lines) {
for (let i = 0; i < line.length; i++) {
let ok = true;
for (let k = 0; k < amount; k++) {
for (let l = k + 1; l < amount; l++) {
if (line[i + k] == line[i + l]) {
ok = false
}
}
}
if (!ok) {
continue
}
console.log(i + amount);
break
}
}
};
// Library code
const fs = require("fs");
const path = require('path');
const day = path.parse(__filename).name;
const files = [
`${day}-test`,
`${day}`,
];
files.forEach(file => {
fs.readFile(`./${file}.txt`, "utf8", (_, data) => {
console.log(`Data from file ${file}.txt`);
solveProblem(data);
console.log("");
});
});