How do you find the size of an array within an array in C?

Question

I'm working on a leetcode problem where you have to iterate through an array that contains other arrays of various lengths. I'm trying to find a way to get the length of the array within the array so that I can iterate through that array.. So far I've tried things like:

size = sizeof(array) / sizeof(int), size = sizeof(array) / sizeof(array[i]), etc..

But each time I get an integer value that seems unrelated to the array itself. I remember doing something like this before, but I can't remember how I did it.. Does anyone know the best way to accomplish something like this?

tl;dr:

Say we are given an **array = [[0,1,2],[0],[]] How would I find the sizes of the individual arrays [0,1,2], [0], and [] within the given array of arrays? Thanks:)

Answer 1

To make my comment an answer:

With a ragged array like **array = [[0,1,2],[0],[]] (pseudo-code, but we can infer what it means) there's no way of retrieving the sizes of each sub-array since that information doesn't exist at runtime. **array is just a pointer to some memory of three addresses to some integers.

The most minimal solution would be to have pointers to slightly "smarter" objects such as

struct IntArray {
  unsigned int count;
  int *data;
}

but that might not be possible for your Leetcode problem.