#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include "aocdailies.h"
#include "aocutils.h"
struct House {
int row, col;
};
#ifndef MAX_HOUSES
# define MAX_HOUSES 2400
#else
# error MAX_HOUSES already defined
#endif
void aoc201503(char *data, size_t len) {
(void)len; // unused argument
struct House house[MAX_HOUSES] = {0};
unsigned nhouse = 1; // 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 == MAX_HOUSES) {
fprintf(stderr, "Need more houses in aoc201503()\n");
exit(EXIT_FAILURE);
}
house[nhouse].row = x;
house[nhouse].col = y;
nhouse += 1;
}
}
printf("Santa delivered at least 1 present to %u houses.\n", nhouse);
}
#undef MAX_HOUSES
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);
}