65 lines
1.4 KiB
JavaScript
65 lines
1.4 KiB
JavaScript
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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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// [[x,y], [x,y], ...]
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let seats = [];
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function makeArray(n) {
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let ary = new Array(n);
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for(i=0; i<n; i++) {
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ary[i] = i;
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}
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return ary;
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}
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readInterface.on('line', function(line) {
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const rowSpec = line.substring(0, 7);
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const colSpec = line.substring(7, 10);
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let row = rowSpec.split('').reduce(function(range, char) {
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const half = Math.floor(range.length / 2);
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let r2 = range;
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switch(char) {
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case 'F': r2 = range.slice(0, half+1); break;
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case 'B': r2 = range.slice(half, range.length); break;
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};
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return r2;
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}, makeArray(128));
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let col = colSpec.split('').reduce(function(range, char) {
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const half = Math.floor(range.length / 2);
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let r2 = range;
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switch(char) {
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case 'L': r2 = range.slice(0, half+1); break;
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case 'R': r2 = range.slice(half,range.length); break;
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};
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return r2;
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}, makeArray(8));
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seats.push([col[0], row[0]]);
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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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