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並前往https://www.quora.com/How-do-I-make-a-2D-array-null-in-C++

How do I make a 2D array null in C++? - Quora

First allocate memory · int** mat = new int*[rows]; · for (int i = 0; i < rows; ++i) · mat[i] = new int[cols]; · Then initialize it to NULL value · memset(mat, 0, ...

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