42 lines
1.0 KiB
JavaScript
42 lines
1.0 KiB
JavaScript
const fs = require('fs')
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const readline = require('readline');
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const readInterface = readline.createInterface({
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input: fs.createReadStream('input'),
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console: false
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});
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let seats = []; // [[x,y], [x,y], ...]
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readInterface.on('line', function(line) {
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let result = line.split('').reduce(function(sp, char) {
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const halfX = Math.floor((1 + sp[2] - sp[0]) / 2);
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const halfY = Math.floor((1 + sp[3] - sp[1]) / 2);
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switch(char) {
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case 'F': sp[3] -= halfY; break;
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case 'B': sp[1] += halfY; break;
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case 'L': sp[2] -= halfX; break;
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case 'R': sp[0] += halfX; break;
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};
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return sp;
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}, [0,0,7,127]);
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seats.push([result[0], result[1]]);
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});
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readInterface.on('close', function(line) {
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let seatIDs = new Set( seats.map((seat) => seat[1]*8 + seat[0]).sort((a,b) => a-b ) );
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for (x=0; x<8; x++) {
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for(y=0; y<128; y++) {
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let seatID = y*8+x;
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if (!seatIDs.has(seatID) && seatIDs.has(seatID-1) && seatIDs.has(seatID+1)) {
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console.log(seatID);
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break;
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}
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}
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}
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});
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