4 lines
279 B
JavaScript
4 lines
279 B
JavaScript
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var input = require("fs").readFileSync("input.txt").toString();
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var lines = input.split("\n").filter((a)=>(a)).map((line)=>(line.split(" ").map((a)=>(line.split(" ").filter((b)=>(b == a)).length == 1)).reduce((a, b)=>(a && b),true))).filter((a)=>(a));
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console.log(lines.length);
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