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