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