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Day22.js
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Day22.js
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fs = require('fs');
fs.readFile('Day22.txt', 'utf8', function(err, data) {
if(err) {
return console.log(err);
}
data = data.trim();
let nodes = data.split('\n').map(line => line.split(''));
let nodesLength = nodes.length;
let count = 0;
let infected = 0;
let coord = {
dir: 'n',
x: Math.floor(nodesLength/2),
y: Math.floor(nodesLength/2)
}
const turnLeft = {
n: 'w',
s: 'e',
e: 'n',
w: 's'
}
const turnRight = {
n: 'e',
w: 'n',
s: 'w',
e: 's'
}
const flip = {
n: 's',
s: 'n',
e: 'w',
w: 'e'
}
while(count < 10000000) {
// printNodes(nodes);
switch(nodes[coord.y][coord.x]) {
case '#':
// turn right
coord.dir = turnRight[coord.dir];
// flag current node
nodes[coord.y][coord.x] = 'F';
// move forward
move(coord);
break;
case '.':
// turn left
coord.dir = turnLeft[coord.dir];
// weaken current node
nodes[coord.y][coord.x] = 'W';
// move forward
move(coord);
break;
case 'F':
// reverse
coord.dir = flip[coord.dir];
// clean current node
nodes[coord.y][coord.x] = '.';
// move forward
move(coord);
break;
case 'W':
// don't turn
// infect current node
nodes[coord.y][coord.x] = '#';
infected++;
// move forward
move(coord);
break;
}
// TODO: fix grid & coords if necessary (when out of range)
if (coord.x < 0 || coord.x === nodes[0].length ||
coord.y < 0 || coord.y === nodes.length) {
adjustNodesAndCoords(coord, nodes);
}
count++;
}
// printNodes(nodes)
console.log("infected:", infected)
});
function adjustNodesAndCoords(coord, nodes) {
if (coord.x < 0) {
nodes.forEach(node => {
node.unshift('.');
})
coord.x = 0;
}
if (coord.x === nodes[0].length) {
nodes.forEach(node => {
node.push('.');
})
}
if (coord.y < 0) {
nodes.unshift(new Array(nodes[0].length).fill('.'));
coord.y = 0;
}
if (coord.y === nodes.length) {
nodes.push(new Array(nodes[0].length).fill('.'));
}
}
function printNodes(nodes) {
nodes.forEach(node => {
console.log(node.join(' '));
})
}
function move(coord) {
switch(coord.dir) {
case 'n':
coord.y--;
break;
case 'w':
coord.x--;
break;
case 's':
coord.y++;
break;
case 'e':
coord.x++;
break;
}
}