aoc day 13 part 2, non-working

part2.c

// Build with cc -std=c99 -o part2 part2.c
//
// Feed it input with stdin. It doesn't matter if your input has an extra
// starting line as in the example input or not. It will be ignored if it
// exists.
#include <stdio.h>
#include <stdlib.h>

typedef signed long long Num;

int main(void)
{
    Num input = 0, nids = 0, *ids = malloc(sizeof(Num) * 5000);
    int more = 0, c;
get:
    c = getchar();
    switch (c)
    {
    case '\n':
        more = 0;
        goto get;
    case EOF:
        ids[nids++] = input;
        goto ready;
    case ',':
        ids[nids++] = input;
        input = 0;
        goto get;
    default:
        if (!more) nids = input = 0;
        if (c >= '0' && c <= '9') input = input * 10 + (Num)(c - '0');
        more = 1;
        goto get;
    }
    // Finished reading input, do calculation
ready:;
    Num t = 0, d = ids[0];
    for (Num i = 1; i < nids; i++)
    {
        Num id = ids[i];
        if (id == 0) continue;
        Num m = 0;
        for (;; m++)
        {
            if (id - ((t + m * d) % id) == i) break;
        }
        printf("%lld\n", t + m * d);
        t = t + m * d;
        d = d * id;
    }
}