#include <ctype.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "aocdailies.h"
#include "aocutils.h"

static const unsigned *vfind(unsigned v, const unsigned *a, size_t n) {
    for (size_t k = 0; k < n; k++) {
        if (a[k] == v) return a + k;
    }
    return NULL;
}

void aoc202405(char *data, size_t len) {
    (void)len; // unused argument
    unsigned pagepair[1200][2], npp = 0; // 1200 works for me
    char *line = strtok(data, "\n");
    while (strchr(line, '|')) {
        char *err;
        pagepair[npp][0] = strtoul(line, &err, 10);
        err += 1; // skip '|'
        pagepair[npp][1] = strtoul(line, &err, 10);
        pagepair[npp][1] = strtoul(err, &err, 10);
        npp++;
        line = strtok(NULL, "\n");
    }
    unsigned update[32], nupdates, maxupdates = 0; // 32 works dor me
    while ((line = strtok(NULL, "\n")) != NULL) {
    unsigned update[32], nupdates; // 32 works for me
    unsigned accumsum = 0;
    do {
        nupdates = 0;
        char *err = line;
        for (;;) {
            update[nupdates++] = strtoul(err, &err, 10);
            if (*err == ',') err++;
            else break;
        }
        if (nupdates % 2 == 0) printf("even number of updates found!\n");
        unsigned accumulate = update[nupdates / 2];
        for (size_t k = 0; k < nupdates; k++) {
        for (size_t k = 0; k < npp; k++) {
            //...
            const unsigned *before = vfind(pagepair[k][0], update, nupdates);
            if (!before) continue;
            const unsigned *after = vfind(pagepair[k][1], update, nupdates);
            if (!after) continue;
            if (before > after) { accumulate = 0; break; }
        }
    }
        accumsum += accumulate;
    } while ((line = strtok(NULL, "\n")) != NULL);
    printf("The sum of middle update numbers is {%u}\n", accumsum);
}

static size_t rcmap(unsigned size, unsigned row, unsigned col) {
    return row * (size + 1) + col;
}

static bool masat(char *data, unsigned size, unsigned row, unsigned col, int drow, int dcol) {