Advent of Code: 2017 Day 1Advent of Code: 2017 Day 2Advent of Code: 2017 Day 3Advent of Code: 2017 Day 4Advent of Code: 2017 Day 5Advent of Code: 2017 Day 6Advent of Code: 2017 Day 7Advent of Code: 2017 Day 8Advent of Code: 2017 Day 9Advent of Code: 2017 Day 10Advent of Code: 2017 Day 11Advent of Code: 2017 Day 12Advent of Code: 2017 Day 13Advent of Code: 2017 Day 14Advent of Code: 2017 Day 15Advent of Code: 2017 Day 16Advent of Code: 2017 Day 17Advent of Code: 2017 Day 18Advent of Code: 2017 Day 20
Advent of Code: 2017 Day 19
function findPath(diagram) {
let [x, y, dx, dy] = [diagram[0].indexOf("|"), 0, 0, 1]; // Start on top row at first vertical pipe facing down.
let letters = "";
let steps = 0;
while (true) {
// Move one step
x += dx;
y += dy;
steps++;
const cell = diagram[y][x];
if (cell === " ") {
return { letters, steps }; // We've come to end of pipe.
}
// Collect letter
if (cell.match(/[A-Z]/)) {
letters += cell;
}
// Change direction at corners.
if (cell === "+") {
[dy, dx] =
dy === 0
? [(dy = diagram[y + 1][x] === " " ? -1 : 1), 0]
: ([dy, dx] = [0, diagram[y][x + 1] === " " ? -1 : 1]);
}
}
}
function part1(input) {
return findPath(input.split("\n")).letters;
}
function part2(input) {
return findPath(input.split("\n")).steps;
}
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