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Lucia Ceionia
2025-12-04 22:05:16 -06:00
parent 5b71ad8ed0
commit 91f73e2aa5
1 changed files with 19 additions and 10 deletions
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29
day4.c
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@@ -12,7 +12,7 @@ unsigned char test[] = {
#embed "day4_test.txt"
};
static
alignas (0x40) static
unsigned char buf[UINT16_MAX];
static
@@ -31,9 +31,9 @@ unsigned long do_part1(size_t file_len, unsigned char file[file_len]) {
unsigned line_count = file_len / file_stride;
unsigned line_stride = file_stride + 1;
unsigned line_stride = MAX(file_stride + 1, 0x40);
memset(d, '0', sizeof(buf));
memset(d, 0, sizeof(buf));
#if DBG
printh(file_stride); print("\n");
@@ -59,7 +59,7 @@ unsigned long do_part1(size_t file_len, unsigned char file[file_len]) {
unsigned char *l = buf + line_stride + 1;
for (unsigned i = line_count; i; i--) {
d = l;
for (unsigned j = line_stride - 2; j; j--) {
for (unsigned j = file_stride - 1; j; j--) {
if (*d == '@') {
unsigned neighbors = 0
+ (*(d - 1 - line_stride) == '@')
@@ -69,9 +69,18 @@ unsigned long do_part1(size_t file_len, unsigned char file[file_len]) {
+ (*(d + 1 - 0) == '@')
+ (*(d - 1 + line_stride) == '@')
+ (*(d - 0 + line_stride) == '@')
+ (*(d + 1 + line_stride) == '@');
+ (*(d + 1 + line_stride) == '@')
+ (*(d - 1 - line_stride) == 'X')
+ (*(d - 0 - line_stride) == 'X')
+ (*(d + 1 - line_stride) == 'X')
+ (*(d - 1 - 0) == 'X')
+ (*(d + 1 - 0) == 'X')
+ (*(d - 1 + line_stride) == 'X')
+ (*(d - 0 + line_stride) == 'X')
+ (*(d + 1 + line_stride) == 'X');
if (neighbors < 4) {
result++;
*d = 'X';
}
}
d++;
@@ -98,9 +107,9 @@ unsigned long do_part2(size_t file_len, unsigned char file[file_len]) {
unsigned line_count = file_len / file_stride;
unsigned line_stride = file_stride + 1;
unsigned line_stride = MAX(file_stride + 1, 0x40);
memset(d, '0', sizeof(buf));
memset(d, 0, sizeof(buf));
#if DBG
printh(file_stride); print("\n");
@@ -127,7 +136,7 @@ unsigned long do_part2(size_t file_len, unsigned char file[file_len]) {
for (unsigned i = line_count; i; i--) {
line_start:
d = l;
for (unsigned j = line_stride - 2; j; j--) {
for (unsigned j = file_stride - 1; j; j--) {
if (*d == '@') {
unsigned neighbors = 0
+ (*(d - 1 - line_stride) == '@')
@@ -161,9 +170,9 @@ line_start:
}
#define RUN_TEST1 1
#define RUN_PART1 1
#define RUN_PART1 0
#define RUN_TEST2 1
#define RUN_PART2 1
#define RUN_PART2 0
#define TEST1_EXPECT 13
#define TEST2_EXPECT 43