Solve 2020/05

master
Alfred Melch 4 years ago
parent 573ac5b393
commit e02c91021c

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const { readInput } = require("./util");
const { lines } = readInput();
function binToInt(binString, oneChar = "1") {
const binArr = Array.from(binString).reverse();
let num = 0;
for (let i = 0; i < binArr.length; i++) {
if (binArr[i] === oneChar) {
num += 2 ** i;
}
}
return num;
}
function seatId(pass) {
const row = binToInt(pass.slice(0, 7), "B");
const col = binToInt(pass.slice(7, 11), "R");
return row * 8 + col;
}
for (const line of lines.slice(0, 10)) {
console.log(line, seatId(line));
}
const seatIds = lines.map(seatId);
console.log(seatIds);
console.log(Math.max(...seatIds));

@ -0,0 +1,31 @@
const { readInput } = require("./util");
const { lines } = readInput();
function binToInt(binString, oneChar = "1") {
const binArr = Array.from(binString).reverse();
let num = 0;
for (let i = 0; i < binArr.length; i++) {
if (binArr[i] === oneChar) {
num += 2 ** i;
}
}
return num;
}
function seatId(pass) {
const row = binToInt(pass.slice(0, 7), "B");
const col = binToInt(pass.slice(7, 11), "R");
return row * 8 + col;
}
const seatIds = new Set(lines.map(seatId));
const maxSeatId = seatId("BBBBBBBRRR");
console.log(maxSeatId);
for (let i = 0; i <= maxSeatId; i++) {
if (!seatIds.has(i) && seatIds.has(i - 1) && seatIds.has(i + 1)) {
console.log(i);
}
}

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const fs = require("fs");
exports.readInput = function (filename = "input") {
const input = fs.readFileSync(filename, "utf-8").trim();
const lines = input.split("\n");
let colLength = lines[0].length;
let colConsistentcy = true;
for (const line of lines) {
if (colLength != line.length) {
colConsistentcy = false;
}
}
const avgLength = sum(lines.map((l) => l.length)) / lines.length;
console.log("Number of lines:", lines.length);
console.log("Col-length is consistent:", colConsistentcy);
console.log("Average col-length", avgLength);
console.log("Sample:");
for (const line of lines.slice(0, 5)) {
console.log(line);
}
console.log("...");
for (const line of lines.slice(lines.length - 5, lines.length)) {
console.log(line);
}
console.log("=".repeat(process.stdout.columns));
return {
raw: input,
lines: lines,
};
};
const sum = (arr) => arr.reduce((a, b) => a + b, 0);
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