File aoc2015.c artifact 6878e59665 part of check-in d415c28af8

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

void aoc201504(char *data, size_t len) {
    (void)len; // unused argument
    unsigned extra = 1;
    char longkey[128];
    for (;;) {
        sprintf(longkey, "%s%u", data, extra);
        //md5(longkey);
        if (1) break;
        extra++;
    }
    printf("Follow your key with %u to obtain five zeroes\n", extra);
}

struct House {
    int row, col;
};

void aoc201503(char *data, size_t len) {
    (void)len; // unused argument
    char *data2 = data; // save it
    struct House *house = malloc(512 * sizeof *house); // assume it worked
    unsigned mhouse = 512, nhouse = 1;
    house[0].row = house[0].col = 0; // house at [0, 0] visited
    int x = 0, y = 0;
    while (*data) {
        switch (*data) {
            default: break;
            case '^': y++; break;
            case 'v': y--; break;
            case '>': x++; break;
            case '<': x--; break;
        }
        data++;
        bool visited = false;
        for (size_t k = 0; k < nhouse; k++) {
            if ((house[k].row == x) && (house[k].col == y)) {
                visited = true;
                break;
            }
        }
        if (!visited) {
            if (nhouse == mhouse) {
                // grow the array (by golden ratio)
                struct House *tmp = realloc(house, (13*mhouse) / 8 * sizeof *house);
                if (!tmp) {
                    fprintf(stderr, "no memory. program aborted\n");
                    exit(EXIT_FAILURE);
                }
                house = tmp;
                mhouse = (13*mhouse) / 8;
            }
            house[nhouse].row = x;
            house[nhouse].col = y;
            nhouse += 1;
        }
    }
    printf("Santa delivered at least 1 present to %u houses.\n", nhouse);

    // reuse house array for part 2; don't worry about its contents
    nhouse = 1; // house at [0, 0] still visited :)
    struct House p[2] = {0}; // coordinates of santa and bot
    int who = 0; // 0: santa; 1: santa bot
    // go around from the beginning
    while (*data2) {
        switch (*data2) {
            default: break;
            case '^': p[who].row++; break;
            case 'v': p[who].row--; break;
            case '>': p[who].col++; break;
            case '<': p[who].col--; break;
        }
        data2++;
        bool visited = false;
        for (size_t k = 0; k < nhouse; k++) {
            if ((house[k].row == p[who].row) && (house[k].col == p[who].col)) {
                visited = true;
                break;
            }
        }
        if (!visited) {
            if (nhouse == mhouse) {
                // grow the array (by golden ratio)
                struct House *tmp = realloc(house, (13*mhouse) / 8 * sizeof *house);
                if (!tmp) {
                    fprintf(stderr, "no memory. program aborted\n");
                    exit(EXIT_FAILURE);
                }
                house = tmp;
                mhouse = (13*mhouse) / 8;
            }
            house[nhouse].row = p[who].row;
            house[nhouse].col = p[who].col;
            nhouse += 1;
        }
        who = 1 - who; // santa; bot; santa; bot; ..., ..., ...
    }
    free(house);
    printf("Santa and santa bot delivered at least 1 present to %u houses.\n", nhouse);
}

void aoc201502(char *data, size_t len) {
    (void)len; // unused argument
    unsigned sqf = 0, f = 0;
    for (;;) {
        char *err;
        unsigned l = strtoul(data, &err, 10);
        if (*err == 0) break;
        data = err + 1; // skip 'x'
        unsigned w = strtoul(data, &err, 10);
        data = err + 1; // skip 'x'
        unsigned h = strtoul(data, &err, 10);
        data = err + 1; // skip newline
        unsigned lw = l * w;
        unsigned wh = w * h;
        unsigned hl = h * l;
        unsigned m = min3u(lw, wh, hl);
        sqf += 2*(lw + wh + hl) + m;
        unsigned M = max3u(l, w, h);
        unsigned feet = 2*(l+w+h - M) + l*h*w;
        f += feet;
    }
    printf("The elves need %u square feet of paper.\n", sqf);
    printf("The elves need %u feet of ribbon.\n", f);
}

void aoc201501(char *data, size_t len) {
    (void)len; // unused argument
    int floor = 0, basementsteps = -1;
    char *ddata = data;                            // save start
    while (*data) {
        if (*data == '(') floor++;
        else if (*data == ')') floor--;
        data++;
        // if entered the basement, part 2 done
        if (floor == -1) {
            basementsteps = data - ddata;          // steps taken
            break;
        }
    }
    // continue with no regard to basement
    while (*data) {
        if (*data == '(') floor++;
        else if (*data == ')') floor--;
        data++;
    }
    printf("Santa is taken to floor {%d}.\n", floor);
    printf("Santa first goes to the basement at step {%d}.\n", basementsteps);
}