HR - 2D Array - DS

'use strict';

import { WriteStream, createWriteStream } from "fs";
process.stdin.resume();
process.stdin.setEncoding('utf-8');

let inputString: string = '';
let inputLines: string[] = [];
let currentLine: number = 0;

process.stdin.on('data', function(inputStdin: string): void {
    inputString += inputStdin;
});

process.stdin.on('end', function(): void {
    inputLines = inputString.split('\n');
    inputString = '';

    main();
});

function readLine(): string {
    return inputLines[currentLine++];
}

/*
 * Complete the 'hourglassSum' function below.
 *
 * The function is expected to return an INTEGER.
 * The function accepts 2D_INTEGER_ARRAY arr as parameter.
 *    
 *  1 1 1 0 0 0

    0 1 0 0 0 0

    1 1 1 0 0 0

    0 0 2 4 4 0

    0 0 0 2 0 0

    0 0 1 2 4 0
 */

function hourglassSum(arr: number[][]): number {
    // Write your code here
    const results : number[] = []
    for(let i = 0; i <= 3; i++){
        for(let j = 0; j <=3; j++){
            results.push(hourglassSumHelper(arr, [i,j]))
        }
    }
    return Math.max(... results)
}

function hourglassSumHelper(arr: number[][], begin: number[]) : number {    
    const idi = begin[0]
    const idj = begin[1]
    const sums = []
    for(let i = 0; i <= 2; i++){
        for(let j =0; j <=2; j++){
            if((i === 1 && j === 1 ) || i !== 1)
                sums.push(arr[idi+i][idj+j])
        }
    }
    return sums.reduce( (a,b) => a+b)
}


function main() {
    const ws: WriteStream = createWriteStream(process.env['OUTPUT_PATH']);

    let arr: number[][] = Array(6);

    for (let i: number = 0; i < 6; i++) {
        arr[i] = readLine().replace(/\s+$/g, '').split(' ').map(arrTemp => parseInt(arrTemp, 10));
    }

    const result: number = hourglassSum(arr);

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

    ws.end();
}