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aoc2022/05/solution.c
2022-12-06 00:09:14 +01:00

79 lines
2.4 KiB
C

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
typedef struct crates {
char *c;
size_t len, alloc;
} crates;
#define alloc_stacks(C) \
if (C) C = realloc(C, sizeof(crates) * A); \
else C = malloc(sizeof(crates) * A); \
for (i = N; i < A; i++) C[i].c = 0;
#define alloc_crates(C, N) \
if (C.c) { \
C.len += N; \
if (C.len > C.alloc) \
C.c = realloc(C.c, C.alloc = C.len); \
} else \
C.c = malloc(C.len = C.alloc = N);
#define crate_pos(C, N) (C.c + C.len + N)
int main(void) {
char l[BUFSIZ], *e, *m = 0, ic, *tc, *tf;
crates *stacksA = 0, *stacksB = 0;
int i, n, N = 0, A, f, t;
while (fgets(l, BUFSIZ, stdin)) {
if (l[0] == 'm') {
n = strtol(l + 5, &e, 10);
f = strtol(e + 6, &e, 10) - 1;
t = atoi(e + 4) - 1;
alloc_crates(stacksA[t], n)
tf = crate_pos(stacksA[f], -1);
tc = crate_pos(stacksA[t], -n);
for (i = 0; i < n; i++)
tc[i] = tf[-i];
stacksA[f].len -= n;
alloc_crates(stacksB[t], n)
tf = crate_pos(stacksB[f], -n);
tc = crate_pos(stacksB[t], -n);
for (i = 0; i < n; i++)
tc[i] = tf[i];
stacksB[f].len -= n;
} else if ((e = strrchr(l, ']'))) {
if (e > m) {
m = e;
A = (m - l) / 4 + 1;
alloc_stacks(stacksA)
alloc_stacks(stacksB)
N = A;
}
for (i = 0; i < N; i++) {
if ((ic = l[i*4+1]) != ' ') {
alloc_crates(stacksA[i], 1)
alloc_crates(stacksB[i], 1)
memmove(stacksA[i].c + 1, stacksA[i].c, stacksA[i].len - 1);
memmove(stacksB[i].c + 1, stacksB[i].c, stacksB[i].len - 1);
stacksA[i].c[0] = ic;
stacksB[i].c[0] = ic;
}
}
}
}
printf("Silver: ");
for (i = 0; i < N; i++)
printf("%c", *crate_pos(stacksA[i], -1));
printf("\nGold: ");
for (i = 0; i < N; i++)
printf("%c", *crate_pos(stacksB[i], -1));
printf("\n");
}