Question

How to combine different sizes 2D array and 1D array by summing element‑by‑element in C#

Answer 1

using System;

class Program
{
    static void Main()
    {
        int[,] a = {
            { 1, 2, 3 }
        };

        int[,] b = {
            { 4, 5 },
            { 9, 8 }
        };

        int rows = Math.Max(a.GetLength(0), b.GetLength(0));
        int cols = Math.Max(a.GetLength(1), b.GetLength(1));

        int[,] merged = new int[rows, cols];

        CopyWithPadding(a, merged);
        CopyWithPadding(b, merged);

        Print(merged);
    }

    static void CopyWithPadding(int[,] src, int[,] dst) {
        for (int i = 0; i < src.GetLength(0); i++)
            for (int j = 0; j < src.GetLength(1); j++)
                dst[i, j] += src[i, j];
    }

    static void Print(int[,] arr) {
        for (int i = 0; i < arr.GetLength(0); i++) {
            for (int j = 0; j < arr.GetLength(1); j++)
                Console.Write(arr[i, j] + " ");
            Console.WriteLine();
        }
    }
}



/*
run:

5 7 3 
9 8 0 

*/

 

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