Depends on your exact needs, if all you care about is accessing elements as
mat[i][j] you can do something like this:
int** matrix;
...
matrix = new int*[M]; // create an array of pointers to int
for (int i = 0; i < M; ++i)
matrix[i] = new int[N]; // create an array of integers for each "ro
how to create 2d or 3d array dynamically , giving the size at run time :
for global array
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