commit d8a5a6058174fbd586c62ffeb1bff9463ec45dd1
parent eb315fd6ef44b8628a7ae4951bb73bc9df022052
Author: amin <dev@aminmesbah.com>
Date: Fri, 3 Dec 2021 23:48:43 +0000
Solve 2021 day 3 part 1
FossilOrigin-Name: bf14727c78a0496fbbcd109ca60060c4eac1d91ad9441f952d54cb5623607b8d
Diffstat:
| A | 2021/day03_01.c | | | 90 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | 2021/day03_input.txt | | | 1000 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
2 files changed, 1090 insertions(+), 0 deletions(-)
diff --git a/2021/day03_01.c b/2021/day03_01.c
@@ -0,0 +1,90 @@
+#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, "day03_input.txt");
+ StrList lines = am_str_split(&a, input, (u8 *)"\n", 1);
+
+ u64 num_columns = lines.first->s.size;
+ u64 *counts = AM_MEM_ARENA_PUSH_ARRAY(&a, u64, num_columns);
+ for (u64 i = 0; i < num_columns; i++) {
+ counts[i] = 0;
+ }
+
+ for (StrListNode *number = lines.first; number; number = number->next) {
+ assert(number->s.size == num_columns);
+ for (u64 i = 0; i < num_columns; i++) {
+ counts[i] += number->s.str[i] == '1';
+ }
+ }
+
+ u64 num_numbers = lines.node_count;
+ assert(num_numbers % 2 == 0);
+ u64 gamma = 0;
+ for (u64 i = 0; i < num_columns; i++) {
+ assert(counts[i] != num_numbers / 2);
+ gamma |= (counts[i] > (num_numbers / 2)) << (num_columns - i - 1);
+ }
+
+ u64 epsilon = (~gamma) & (0xFFFFFFFF >> (64 - num_columns));
+
+ printf("Power consumption: %" PRIu64 "\n", gamma * epsilon);
+ am_mem_arena_release(&a);
+ return 0;
+}
diff --git a/2021/day03_input.txt b/2021/day03_input.txt
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