magic-square-forming.js

'use strict';

const fs = require('fs');

process.stdin.resume();
process.stdin.setEncoding('utf-8');

let inputString = '';
let currentLine = 0;

process.stdin.on('data', inputStdin => {
    inputString += inputStdin;
});

process.stdin.on('end', function () {
    inputString = inputString.replace(/\s*$/, '')
        .split('\n')
        .map(str => str.replace(/\s*$/, ''));

    main();
});

function readLine() {
    return inputString[currentLine++];
}

// Complete the formingMagicSquare function below.
function formingMagicSquare(arr) {
    var v = [[
        [8, 1, 6], [3, 5, 7], [4, 9, 2]],
    [[6, 1, 8], [7, 5, 3], [2, 9, 4]],
    [[4, 9, 2], [3, 5, 7], [8, 1, 6]],
    [[2, 9, 4], [7, 5, 3], [6, 1, 8]],
    [[8, 3, 4], [1, 5, 9], [6, 7, 2]],
    [[4, 3, 8], [9, 5, 1], [2, 7, 6]],
    [[6, 7, 2], [1, 5, 9], [8, 3, 4]],
    [[2, 7, 6], [9, 5, 1], [4, 3, 8]]
    ];
    var max = [];
    for (var k = 0; k < v.length; k++) {
        var c = 0;
        for (var i = 0; i < 3; i++) {
            for (var j = 0; j < 3; j++) {
                c += Math.abs(arr[i][j] - v[k][i][j]);
            }
        }
        max.push(c);
    }
    return max.sort((a,b)=>a-b)[0];
}

function main() {
    const ws = fs.createWriteStream(process.env.OUTPUT_PATH);

    let s = Array(3);

    for (let i = 0; i < 3; i++) {
        s[i] = readLine().split(' ').map(sTemp => parseInt(sTemp, 10));
    }

    const result = formingMagicSquare(s);

    ws.write(result + '\n');

    ws.end();
}