commit 82496552846aff445e040d4d4624366b84b366ad
parent 70701b9b997344026cbbbc5ff2c14c1a513aa3d1
Author: amin <dev@aminmesbah.com>
Date: Fri, 3 Dec 2021 22:53:44 +0000
Solve 2021 day 2 part 1
FossilOrigin-Name: 07ed5af19e88c861c798d772d59613b44f0f2d611d4408a32e8ce8b278545fa6
Diffstat:
| A | 2021/day02_01.c | | | 102 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | 2021/day02_input.txt | | | 1000 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
2 files changed, 1102 insertions(+), 0 deletions(-)
diff --git a/2021/day02_01.c b/2021/day02_01.c
@@ -0,0 +1,102 @@
+#if 0
+# Self-building c file. Invoke like: `./file.c`
+outdir=out
+input=$(basename "$0")
+output="$outdir"/$(basename "$0" .c)
+if [ "$input" -nt "$output" ];
+then
+ mkdir --parents "$outdir" || exit
+ echo "Building ${output}." || exit
+ clang -std=c11 -Wall -Wextra -pedantic -Wno-unused-function "$input" -o "$output" || exit
+fi
+if [ "$1" = "-r" ];
+then
+ ./"$output" "$@"
+fi
+exit
+#endif
+
+#include <errno.h>
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+_Noreturn void assert_fail(const char *expr, const char *file, int line, const char *func) {
+ fprintf(stderr, "%s:%d: %s: Assertion failed: '%s'\n", file, line, func, expr);
+ abort();
+}
+
+#define AM_ENABLE_ASSERT 1
+#define AM_ASSERT_FAIL(expr, file, line, func) assert_fail(expr, file, line, func)
+#include "am_base.h"
+#include "am_memory.h"
+#include "am_list.h"
+#include "am_string.h"
+
+Str open_file(MemArena *arena, char *path) {
+ FILE *f = fopen(path, "r");
+ assert(f);
+
+ s32 error = fseek(f, 0L, SEEK_END);
+ assert(!error);
+
+ s64 size = ftell(f);
+ assert(size >= 0);
+ rewind(f);
+
+ u8 *buf = am_mem_arena_push(arena, size);
+ assert(buf);
+
+ size_t items_read = fread(buf, 1, size, f);
+ assert(items_read == (size_t)size);
+
+ error = fclose(f);
+ assert(!error);
+
+ return am_str(buf, size);
+}
+
+int main(void) {
+ MemArena a = am_mem_arena_create(am_mem_base_allocator_malloc());
+ Str input = open_file(&a, "day02_input.txt");
+ StrList tokens = am_str_split(&a, input, (u8 *)"\n ", 2);
+
+ struct {
+ s64 horizontal;
+ s64 depth;
+ } position = {0};
+
+ s64 *dimension = NULL;
+ s64 sign = 0;
+ bool expect_command = true;
+
+ for (StrListNode *token = tokens.first; token; token = token->next) {
+ if (expect_command) {
+ if (am_str_eq(token->s, AM_STR_LIT("forward"))) {
+ dimension = &position.horizontal;
+ sign = 1;
+ } else if (am_str_eq(token->s, AM_STR_LIT("up"))) {
+ dimension = &position.depth;
+ sign = -1;
+ } else if (am_str_eq(token->s, AM_STR_LIT("down"))) {
+ dimension = &position.depth;
+ sign = 1;
+ } else {
+ assert(false);
+ }
+ expect_command = false;
+ } else {
+ assert(dimension);
+ assert(sign == -1 || sign == 1);
+ assert(token->s.size == 1);
+ assert(token->s.str[0] >= '0' && token->s.str[0] <= '9');
+ *dimension += sign * (token->s.str[0] - '0');
+ expect_command = true;
+ }
+ }
+
+ printf("Multiplied position dimensions: %" PRId64 "\n", position.horizontal * position.depth);
+
+ am_mem_arena_release(&a);
+ return 0;
+}
diff --git a/2021/day02_input.txt b/2021/day02_input.txt
@@ -0,0 +1,1000 @@
+forward 1
+forward 2
+down 5
+down 5
+down 4
+down 9
+up 6
+up 7
+down 2
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