I've updated the description with a detailed specification of the input.

You need to specify the input in the description. e.g. the image is represented as single char * split over multiple lines, it will always have length/width of blah, holes in circles will never include the circle's edge, etc.

kindly do not post solutions like this, as it goes to the main comment thread where nobody wants to see it

#include <stddef.h>
#include <stdlib.h>

int *twin_sum_solutions(int *input, size_t input_len, size_t *output_len) {
if (input_len < 2) {
*output_len = 0;
return NULL; // Return NULL if there are no pairs
}

int *res = malloc(input_len * sizeof(int));  // Allocate memory for the result
if (!res) {
    *output_len = 0;
    return NULL;  // Return NULL if memory allocation fails
}

*output_len = 0;  // Initialize the result counter

for (size_t i = 0; i < input_len - 1; i++) {
    if (input[i] == input[i + 1]) {  // Check if it's a matching pair
        res[*output_len] = input[i] * 2;  // Store the "twin sum"
        (*output_len)++;
        i++;  // Skip the next element as it's already processed
    }
}

// Resize the memory to the correct size of results
int *final_result = realloc(res, *output_len * sizeof(int));

// If realloc fails and there are results, free the memory
if (!final_result && *output_len > 0) {
    free(res);
    *output_len = 0;
    return NULL;
}

return final_result;  // Return the result (or NULL if no results)

}

tester("pneumonoultramicroscopicsilicovolcanoconiosis", "sisoinoconaclovociliscipocsorcimartluonomuenp");

Merged.

Fixed spelling mistake in C translation.

I think you do not need len. It is a dice so the number of faces is always 6. Unless you are considering a dice for dungeons and dragons.

Yea, I should've chosen a better name. Thanks :D

love it, just the name of prod is a bit misleading, took me a bit to realize what you wanted to do
its actually a denominator of the quotient, so when i(sum-i) is maximum, q is minimum
nice :)

once again, dont make it look good- make it look intimidating... :)

umm really?????

I just ported their code to C. I didn't add any extra features to detect foul play.

u really wanna do this? i dont even know c that much, just the basics :(

Would you mind your language a bit.