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26 lines
636 B
JavaScript
26 lines
636 B
JavaScript
const fs = require("fs");
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function setCharAt(str, index, chr) {
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if (index > str.length - 1) return str;
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return str.substring(0, index) + chr + str.substring(index + 1);
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}
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const input = fs.readFileSync("input", "utf-8");
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const rows = input.split("\n");
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console.log(rows.slice(0, 10));
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let countTrees = 0;
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let curX = 0;
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for (let curY = 1; curY < rows.length; curY++) {
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curX = (curX + 3) % rows[curY].length;
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const row = rows[curY];
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const field = rows[curY][curX];
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rows[curY] = setCharAt(row, curX, field === "#" ? "X" : "O");
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if (field === "#") countTrees++;
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}
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console.log(rows.slice(0, 10));
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console.log(countTrees);
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