Reading a Text File into a 2D Array in C

ReadInto2DArray.c

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

int main(int argc, char *argv[])
{
	// Allocate memory for the array like this:

	int** array;

	array = malloc(n * sizeof(*array)); /* Assuming `n` is the number of rows */
	if(!array) /* If `malloc` failed */
	{
	    fputs(stderr, ""Error allocating memory; Bailing out!"");
	    exit(-1);
	}

	int count = 1;
	for(int i = 0; i < n; i++)
	{
	    array[i] = malloc(count * sizeof(**array));
	    if(!array[i]) /* If `malloc` failed */
	    {
	        for(int j = 0; j < i; j++) /* free previously allocated memory */
	        {
	            free(array[j]); 
	        }
	        free(array);

	        fputs(stderr, ""Error allocating memory; Bailing out!"");
	        exit(-1);
	    }
	    count++;
	}

	// Then, read data from the file into the array by using:

	FILE* fp = fopen(""file.txt"", ""r"");
	if(!fp)
	{
	   for(int i = 0; i < n; i++) /* free previously allocated memory */
	   {
	      free(array[i]); 
	   }
	   free(array);

	   fputs(stderr, ""Error opening 'file.txt'; Bailing out!"");
	   exit(-1);
	}

	int max = 1;

	for(int i = 0; i < n; i++)
	{
	    for(count = 0; count < max; count++)
	    {
	        fscanf(fp, ""%d"", &array[i][count]);
	    }
	    max++;
	}

	// Then print the results:

	max = 1;

	for(int i = 0; i < n; i++)
	{
	    for(count = 0; count < max; count++)
	    {
	        printf(""array[%d][%d] = %d"", i, count, array[i][count]);
	    }
	    max++;
	}

	// And finally, free the allocated memory:

	for(int i = 0; i < n; i++)
	{
	   free(array[i]); 
	}
	free(array);
}

PROBLEM STATEMENT

I have a text file that looks like the following.

5
2 7
3 4 2

Basically, row 1 has 1 element, row 2 has 2 elements, row 3 has 3 elements, ... up to n rows with n elements.

I need to read them, and put into a 2-d array in this fashion:

a[0][0] = 5
a[1][0] = 2
a[1][1] = 7
a[2][0] = 3
a[2][1] = 4
a[2][2] = 2
...

You get the drift.

However I know n (the number of rows) only at run time. How would I go about reading the file into a 2x2 array?

StackOverflow post:
http://stackoverflow.com/questions/33579813/reading-a-text-file-into-a-two-dimentional-array-in-c