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2D Array Construction from 1D Array: Step-by-Step Explanation

This README provides a detailed, step-by-step explanation of how to convert a 1D array into a 2D array with specified dimensions (m x n). The explanations are presented for multiple programming languages, including C++, Java, JavaScript, Python, and Go.

C++ Code Explanation

  1. Check Array Size Compatibility:

    • Verify if the number of elements in the original array matches the required size for the 2D array (m * n). If they do not match, return an empty 2D array.

  2. Initialize the 2D Array:

    • Create a 2D vector result with m rows and n columns, initialized with zeros.

  3. Populate the 2D Array:

    • Iterate through each element of the original array.
    • For each element, calculate the corresponding row and column indices in the 2D array.
    • Assign the element from the original array to the appropriate position in the 2D array.

  4. Return the Result:

    • Return the fully constructed 2D array.

Java Code Explanation

  1. Check Array Size Compatibility:

    • Determine if the number of elements in the original array matches the required size for the 2D array (m * n). If not, return an empty 2D array.

  2. Initialize the 2D Array:

    • Create a 2D array result with dimensions m x n.

  3. Populate the 2D Array:

    • Loop through each element of the original array.
    • Calculate the row index using integer division and the column index using the modulus operation.
    • Assign each element to its correct position in the 2D array.

  4. Return the Result:

    • Return the constructed 2D array as the final output.

JavaScript Code Explanation

  1. Check Array Size Compatibility:

    • Check if the total number of elements in the original array matches the required size (m * n). If not, return an empty array.

  2. Initialize the 2D Array:

    • Create an empty array result to store the rows of the 2D array.

  3. Populate the 2D Array:

    • Loop through the number of rows (m).
    • For each row, slice a segment of the original array to form a row of the 2D array.

  4. Return the Result:

    • Return the fully constructed 2D array.

Python Code Explanation

  1. Check Array Size Compatibility:

    • Verify if the size of the original list matches the required size (m * n). If not, return an empty list.

  2. Initialize the 2D Array:

    • Create an empty list result to store the rows of the 2D array.

  3. Populate the 2D Array:

    • Iterate over the range of rows (m).
    • For each row, slice the original list to form a sub-list representing that row.
    • Append the sub-list to result.

  4. Return the Result:

    • Return the constructed 2D array.

Go Code Explanation

  1. Check Array Size Compatibility:

    • Ensure that the length of the original slice matches the required size (m * n). If not, return an empty 2D array.

  2. Initialize the 2D Array:

    • Create a 2D slice result with m rows.

  3. Populate the 2D Array:

    • Loop through the rows of the 2D array.
    • For each row, slice the original array to form a sub-slice representing that row.

  4. Return the Result:

    • Return the fully constructed 2D array.