2022: Day 3 complete

This commit is contained in:
Andrew Scott 2022-12-13 23:49:47 -05:00
parent b0a7b6c07d
commit 0e70725656
Signed by: a
GPG key ID: 7CD5A5977E4931C1
2 changed files with 405 additions and 0 deletions

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2022/3.c Normal file
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// Find badges for part 2
char find_badge(char group[3][50]) {
for (int i = 0; i < strlen(group[0]); i++) {
for (int j = 0; j < strlen(group[1]); j++) {
for (int k = 0; k < strlen(group[2]); k++) {
if (group[0][i] == group[1][j] && group[1][j] == group[2][k]) {
return group[0][i];
}
}
}
}
return 0;
}
// Find items for part 1
char find_item(char *items) {
int len = strlen(items);
int mid = len / 2;
for (int i = 0; i < mid; i++) {
for (int j = mid; j < len; j++) {
if (items[i] == items[j]) {
return items[i];
}
}
}
return 0;
}
// Updates item_sum / badge_sum when match is found
void update_sum(const char c, int *sum) {
if (c > 64 && c < 91) {
*sum += c - 38;
} else if (c > 96 && c < 123) {
*sum += c - 96;
}
}
int main(int argc, char *argv[]) {
if (argc != 2) {
fprintf(stderr, "USAGE: %s input_file\n", argv[0]);
return 1;
}
FILE *file = fopen(argv[1], "r");
if (!file) {
perror("fopen");
return 1;
}
char items[50] = {0};
char group[3][50] = {0};
int item_sum = 0, badge_sum = 0, idx = 0;
while (fgets(items, sizeof items / sizeof *items, file) != NULL) {
if (strlen(items) == 1) {
break;
}
// Part 1 - find misplaced items
items[strlen(items) - 1] = '\0';
char match = find_item(items);
if (!match) {
fprintf(stderr, "Match not found: %s\n", items);
}
update_sum(match, &item_sum);
// Part 2 - find badges among groups of 3
memcpy(group[idx], items, strlen(items));
idx++;
if (idx == 3) {
idx = 0;
char badge = find_badge(group);
if (!badge) {
fprintf(stderr,
"Badge not found among the following group:\n%s\n%s\n%s\n",
group[0], group[1], group[2]);
}
update_sum(badge, &badge_sum);
for (int i = 0; i < sizeof group / sizeof *group; i++) {
memset(group[i], 0, sizeof group[0] / sizeof *group[0]);
}
}
memset(items, 0, sizeof items / sizeof *items);
}
fclose(file);
printf("Part 1 - Sum of item priorities: %d\n", item_sum);
printf("Part 2 - Sum of badge priorities: %d\n", badge_sum);
return 0;
}

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