How can I avoid subscript out-of-range errors when using a vector of vectors to represent a matrix?

Vector of Vectors for Matrix Construction and Handling

In the context of representing a 2D matrix, one approach is to employ a vector of vectors, where each inner vector represents a row in the matrix. However, while attempting to read user input and populate this representation, you may encounter subscript out-of-range errors. To resolve this issue, we need to adequately initialize the vector of vectors before accessing its elements.

The key to successful initialization lies in setting the correct dimensions for the matrix. In your provided code snippet, you have defined RR and CC to represent the number of rows and columns, respectively. Based on these dimensions, you need to initialize matrix with the appropriate size using the following declaration:

<code class="cpp">vector<vector<int>> matrix(RR, vector<int>(CC));</code>

By doing so, you create a vector matrix of size RR, where each element in matrix is a vector of size CC. Essentially, you are creating a 2D representation with the user-specified dimensions and initializing each element to 0.

With this initialization, you can proceed to populate the matrix by accessing elements via matrix[i][j], where i represents the row index and j represents the column index. This will enable you to read in user input and store it effectively in the 2D matrix representation.

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