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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
static char rules[256][256] = { 0 };
// Who cares about code repetition? :P
static int ind = 0;
int verify(char *inp, char *rule)
{
char ch;
int num1, num2, num3, num4, num5;
if (sscanf(rule, "%d %d | %d %d %d", &num1, &num2, &num3, &num4, &num5) == 5) {
int i = ind;
if ((verify(inp, rules[num1]) && verify(inp, rules[num2])) ||
((ind = i), verify(inp, rules[num3]) && verify(inp, rules[num4]) &&
verify(inp, rules[num5]))) {
return ind;
} else {
return 0;
}
} else if (sscanf(rule, "%d %d | %d %d", &num1, &num2, &num3, &num4) == 4) {
int i = ind;
if ((verify(inp, rules[num1]) && verify(inp, rules[num2])) ||
((ind = i), verify(inp, rules[num3]) && verify(inp, rules[num4]))) {
return ind;
} else {
return 0;
}
} else if (sscanf(rule, "%d | %d %d", &num1, &num2, &num3) == 3) {
int i = ind;
if (verify(inp, rules[num1]) ||
((ind = i), verify(inp, rules[num2]) && verify(inp, rules[num3]))) {
return ind;
} else {
return 0;
}
} else if (sscanf(rule, "%d | %d", &num1, &num2) == 2) {
int i = ind;
if (verify(inp, rules[num1]) || ((ind = i), verify(inp, rules[num2]))) {
return ind;
} else {
return 0;
}
} else if (sscanf(rule, "%d %d", &num1, &num2) == 2) {
if (verify(inp, rules[num1]) && verify(inp, rules[num2])) {
return ind;
} else {
return 0;
}
} else if (sscanf(rule, "%d", &num1) == 1) {
if (verify(inp, rules[num1])) {
return ind;
} else {
return 0;
}
} else if (sscanf(rule, "\"%c\"", &ch) == 1) {
return ch == inp[ind] ? ++ind : 0;
} else {
printf("PANIC: %s, %s\n", inp, rule);
exit(0);
}
return 0;
}
long part_one(FILE *fp)
{
long res = 0;
int paragraph = 0;
char *line = NULL;
size_t len;
while (getline(&line, &len, fp) != -1) {
if (line[0] == '\n') {
paragraph++;
continue;
}
if (paragraph == 0) {
char rule[64] = { 0 };
int ind = 0;
sscanf(line, "%d: %64[0-9a-z \"|]", &ind, rule);
strcpy(rules[ind], rule);
} else if (paragraph == 1) {
ind = 0;
if (verify(line, rules[0]) == strlen(line) - 1)
res++;
}
}
return res;
}
long part_two(FILE *fp)
{
long res = 0;
int paragraph = 0;
char *line = NULL;
size_t len;
while (getline(&line, &len, fp) != -1) {
if (line[0] == '\n') {
paragraph++;
continue;
}
if (paragraph == 0) {
char rule[64] = { 0 };
int ind = 0;
sscanf(line, "%d: %64[0-9a-z \"|]", &ind, rule);
strcpy(rules[ind], rule);
} else if (paragraph == 1) {
ind = 0;
if (verify(line, rules[0]) == strlen(line) - 1)
res++;
}
}
return res;
}
int main(int argc, char *argv[])
{
FILE *fp1 = fopen("input1", "r");
if (!fp1)
exit(EXIT_FAILURE);
FILE *fp2 = fopen("input2", "r");
if (!fp2)
exit(EXIT_FAILURE);
clock_t tic = clock();
printf("%lu\n", part_one(fp1));
printf("%lu\n", part_two(fp2));
clock_t toc = clock();
printf("TIME: %f seconds\n", (double)(toc - tic) / CLOCKS_PER_SEC);
fclose(fp1);
fclose(fp2);
return 0;
}
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