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c 2024 day 5 part 2

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This commit is contained in:
Bill Rossi 2024-12-05 01:26:05 -05:00
parent f71ba6fb32
commit 5036432898
1 changed files with 24 additions and 1 deletions
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25
c/2024/5/print_queue.c
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@ -42,10 +42,29 @@ int middle_page_number(Update *update) {
return update->page[update->length / 2]; return update->page[update->length / 2];
} }
void reorder_update(Rules *rules, Update *update) {
bool dirty = true;
while (dirty) {
dirty = false;
for (int i = 0; i < update->length - 1; i++) {
for (int j = 0; j < rules->length; j++) {
Rule rule = rules->rule[j];
if (update->page[i] == rule.last && update->page[i + 1] == rule.first) {
dirty = true;
update->page[i] = rule.first;
update->page[i + 1] = rule.last;
break;
}
}
}
}
}
int main() { int main() {
char *line; char *line;
int sum = 0; int sum = 0;
int reorder_sum = 0;
Rules rules; Rules rules;
int rule_index = 0; int rule_index = 0;
@ -72,11 +91,15 @@ int main() {
update_element = strtok(NULL, ","); update_element = strtok(NULL, ",");
} }
if (valid_update(&rules, &update)) sum += middle_page_number(&update); if (valid_update(&rules, &update)) sum += middle_page_number(&update);
else {
reorder_update(&rules, &update);
reorder_sum += middle_page_number(&update);
}
} }
} }
printf("Part 1: %d\n", sum); printf("Part 1: %d\n", sum);
// printf("Part 2: %d\n", xmas_sum); printf("Part 2: %d\n", reorder_sum);
aoc_free(); aoc_free();
return 0; return 0;