commit b7aa4dda708d1b8068146bdad5f2c80242ab57cd
parent 67f21dffe7f1ecc452440b9b82ef27fa0a6b2be3
Author: night0721 <[email protected]>
Date: Sat, 2 Dec 2023 19:52:04 +0000
add c source files for day 2
Diffstat:
| A | 2023/2/1.c | | | 125 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | 2023/2/2.c | | | 128 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
2 files changed, 253 insertions(+), 0 deletions(-)
diff --git a/2023/2/1.c b/2023/2/1.c
@@ -0,0 +1,125 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <stdbool.h>
+#include <ctype.h>
+
+typedef struct {
+ int id;
+ int colors[3];
+} game;
+
+char** str_split(char* a_str, const char a_delim)
+{
+ char** result = 0;
+ size_t count = 0;
+ char* tmp = a_str;
+ char* last_comma = 0;
+ char delim[2];
+ delim[0] = a_delim;
+ delim[1] = 0;
+ /* Count how many elements will be extracted. */
+ while (*tmp)
+ {
+ if (a_delim == *tmp)
+ {
+ count++;
+ last_comma = tmp;
+ }
+ tmp++;
+ }
+ /* Add space for trailing token. */
+ count += last_comma < (a_str + strlen(a_str) - 1);
+ /* Add space for terminating null string so caller
+ knows where the list of returned strings ends. */
+ count++;
+ result = malloc(sizeof(char*) * count);
+ if (result)
+ {
+ size_t idx = 0;
+ char* token = strtok(a_str, delim);
+ while (token)
+ {
+ assert(idx < count);
+ *(result + idx++) = strdup(token);
+ token = strtok(0, delim);
+ }
+ assert(idx == count - 1);
+ *(result + idx) = 0;
+ }
+ return result;
+}
+
+// Note: This function returns a pointer to a substring of the original string.
+// If the given string was allocated dynamically, the caller must not overwrite
+// that pointer with the returned value, since the original pointer must be
+// deallocated using the same allocator with which it was allocated. The return
+// value must NOT be deallocated using free() etc.
+char *trimwhitespace(char *str)
+{
+ char *end;
+
+ // Trim leading space
+ while(isspace((unsigned char)*str)) str++;
+
+ if(*str == 0) // All spaces?
+ return str;
+
+ // Trim trailing space
+ end = str + strlen(str) - 1;
+ while(end > str && isspace((unsigned char)*end)) end--;
+
+ // Write new null terminator character
+ end[1] = '\0';
+
+ return str;
+}
+
+int main() {
+ FILE *inputfile = fopen("./input", "r");
+ char line[1024] = { 0 };
+ int sum = 0;
+ size_t len = 0;
+ ssize_t read;
+ if (inputfile == NULL) {
+ printf("Input file not found. Exiting.");
+ exit(1);
+ }
+ while (fgets(line, 1024, inputfile)) {
+ int colors[3] = { 0, 0, 0 };
+ line[strcspn(line, "\n")] = 0;
+ char **splitted = str_split(line, ':');
+ char *id = str_split(splitted[0], ' ')[1];
+ char **sets = str_split(splitted[1], ';');
+ bool ok = true;
+ for (int i = 0; sets[i]; i++) {
+ int colors[3] = { 0, 0, 0 };
+ sets[i] = trimwhitespace(sets[i]);
+ char **subset = str_split(sets[i], ',');
+ for (int j = 0; subset[j]; j++) {
+ subset[j] = trimwhitespace(subset[j]);
+ char **splittedsubset = str_split(subset[j], ' ');
+ char *count = splittedsubset[0];
+ char *color = splittedsubset[1];
+ if (strncmp(color, "red", 3) == 0) {
+ colors[0] = atoi(count);
+ } else if (strncmp(color, "green", 5) == 0) {
+ colors[1] = atoi(count);
+ } else if (strncmp(color, "blue", 4) == 0) {
+ colors[2] = atoi(count);
+ }
+ }
+ if (colors[0] > 12 || colors[1] > 13 || colors[2]> 14) {
+ ok = false;
+ }
+ }
+ if (ok) {
+ sum += atoi(id);
+ }
+ free(splitted);
+ }
+ fclose(inputfile);
+ printf("%d\n", sum);
+ return 0;
+}
diff --git a/2023/2/2.c b/2023/2/2.c
@@ -0,0 +1,128 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <ctype.h>
+
+typedef struct {
+ int id;
+ int colors[3];
+} game;
+
+char** str_split(char* a_str, const char a_delim)
+{
+ char** result = 0;
+ size_t count = 0;
+ char* tmp = a_str;
+ char* last_comma = 0;
+ char delim[2];
+ delim[0] = a_delim;
+ delim[1] = 0;
+ /* Count how many elements will be extracted. */
+ while (*tmp)
+ {
+ if (a_delim == *tmp)
+ {
+ count++;
+ last_comma = tmp;
+ }
+ tmp++;
+ }
+ /* Add space for trailing token. */
+ count += last_comma < (a_str + strlen(a_str) - 1);
+ /* Add space for terminating null string so caller
+ knows where the list of returned strings ends. */
+ count++;
+ result = malloc(sizeof(char*) * count);
+ if (result)
+ {
+ size_t idx = 0;
+ char* token = strtok(a_str, delim);
+ while (token)
+ {
+ assert(idx < count);
+ *(result + idx++) = strdup(token);
+ token = strtok(0, delim);
+ }
+ assert(idx == count - 1);
+ *(result + idx) = 0;
+ }
+ return result;
+}
+
+// Note: This function returns a pointer to a substring of the original string.
+// If the given string was allocated dynamically, the caller must not overwrite
+// that pointer with the returned value, since the original pointer must be
+// deallocated using the same allocator with which it was allocated. The return
+// value must NOT be deallocated using free() etc.
+char *trimwhitespace(char *str)
+{
+ char *end;
+
+ // Trim leading space
+ while(isspace((unsigned char)*str)) str++;
+
+ if(*str == 0) // All spaces?
+ return str;
+
+ // Trim trailing space
+ end = str + strlen(str) - 1;
+ while(end > str && isspace((unsigned char)*end)) end--;
+
+ // Write new null terminator character
+ end[1] = '\0';
+
+ return str;
+}
+
+int main() {
+ FILE *inputfile = fopen("./input", "r");
+ char line[1024] = { 0 };
+ int sum = 0;
+ size_t len = 0;
+ ssize_t read;
+ if (inputfile == NULL) {
+ printf("Input file not found. Exiting.");
+ exit(1);
+ }
+ while (fgets(line, 1024, inputfile)) {
+ int colors[3] = { 0, 0, 0 };
+ line[strcspn(line, "\n")] = 0;
+ char **splitted = str_split(line, ':');
+ char *id = str_split(splitted[0], ' ')[1];
+ char **sets = str_split(splitted[1], ';');
+ int maxes[3] = { 0, 0, 0 };
+ for (int i = 0; sets[i]; i++) {
+ int colors[3] = { 0, 0, 0 };
+ sets[i] = trimwhitespace(sets[i]);
+ char **subset = str_split(sets[i], ',');
+ for (int j = 0; subset[j]; j++) {
+ subset[j] = trimwhitespace(subset[j]);
+ char **splittedsubset = str_split(subset[j], ' ');
+ char *count = splittedsubset[0];
+ char *color = splittedsubset[1];
+ if (strncmp(color, "red", 3) == 0) {
+ colors[0] = atoi(count);
+ } else if (strncmp(color, "green", 5) == 0) {
+ colors[1] = atoi(count);
+ } else if (strncmp(color, "blue", 4) == 0) {
+ colors[2] = atoi(count);
+ }
+ if (colors[0] > maxes[0]) {
+ maxes[0] = colors[0];
+ }
+ if (colors[1] > maxes[1]) {
+ maxes[1] = colors[1];
+ }
+ if (colors[2] > maxes[2]) {
+ maxes[2] = colors[2];
+ }
+ }
+ }
+ sum += maxes[0] * maxes[1] * maxes[2];
+ free(splitted);
+ }
+ fclose(inputfile);
+ printf("%d\n", sum);
+ return 0;
+}
