Programming

string s = "2,4,8,16";
vector<int> n;
transform(s.begin(), s.end(), [](char c){return c == ';' ? ' ' : c});
stringstream ss(s);
copy(istream_iterator<int>(ss), istream_iterator<int>(), back_inserter(n));

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(void)
{
        char *input="[11,12,13,14][21,22,23,24][31,32,33,34][41,42,43,44]";
        // Used like a 2D array once it's populated.  arrarr[0][0] would be 11, arrarr[0][1] would be 12, arrarr[1][0] would be 21...
        int **arrarr=NULL;
        int row=-1, n;

        while(input != NULL)
        {
                arrarr=realloc(arrarr, sizeof(int *)*(++row+1));
                arrarr[row]=malloc(4*sizeof(int));

                if(sscanf(input, "[%d,%d,%d,%d]",
                        &(arrarr[row][0]), &(arrarr[row][1]),
                        &(arrarr[row][2]),&(arrarr[row][3])) != 4)
                {
                        fprintf(stderr, "Bad row:  %s\n", input);
                        exit(1);
                }

                input=strchr(input+1,'[');
        }

        for(n=0; n<=row; n++)
                printf("Row %d [%d,%d,%d,%d]\n",
                        n, (arrarr[n][0]), (arrarr[n][1]),
                        (arrarr[n][2]),(arrarr[n][3]));
}

$ ./a.out
Row 0 [11,12,13,14]
Row 1 [21,22,23,24]
Row 2 [31,32,33,34]
Row 3 [41,42,43,44]

$