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paizaラーニング レベルアップ問題集 線形探索メニュー応用編 JavaScript 二次元データ 2

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二次元データ 2 (paizaランク B 相当)

解答例

メソッドを駆使して解いてみました。

const fs = require("fs");
const input = fs.readFileSync("/dev/stdin", "utf-8").trim();
const lines = input.split("\n");

const [n, m, k] = lines[0].split(" ").map(Number);

console.log(
  lines.slice(1)
    .map(line => line.split(" ").filter(v => Number(v) === k).length)
    .reduce((a, b) => a + b)
);
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