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paizaラーニング レベルアップ問題集 新・Bランクレベルアップメニュー JavaScript 【マップの扱い 1】マップの書き換え・1 マス

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【マップの扱い 1】マップの書き換え・1 マス (paizaランク C 相当)

解答例

slice,map,joinを使いました。

const fs = require("fs");
const input = fs.readFileSync("/dev/stdin", "utf-8").trim();
const lines = input.split("\n");
//盤面の行数を表す整数 H , 盤面の列数を表す整数 W 
const [H, W] = lines[0].split(" ").map(Number);
//盤面の i 行目の文字をまとめた文字列 S
const S = lines.slice(1, H + 1).map(line => line.split(""));

//文字を書き換えるマスの y , x 座標
const [y, x] = lines[H + 1].split(" ").map(Number);

if (S[y][x] === ".") {
  S[y][x] = "#";
} else {
  S[y][x] = ".";
}

console.log(S.map(row => row.join("")).join(("\n")));
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